Relevant bibliographies by topics / Ewes / Dissertations / Theses
To see the other types of publications on this topic, follow the link: Ewes.

Dissertations / Theses on the topic 'Ewes'

Author: Grafiati
Published: 4 June 2021
Last updated: 20 February 2023

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 dissertations / theses for your research on the topic 'Ewes.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.

1

Smith, Keith Charles. "Reproductive abnormalities in ewes." Thesis, University of Bristol, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.319129.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Kleemann, D. O. "A study of factors affecting embryonic, fetal and lamb survival in high fecundity merino ewes." Title page, table of contents and abstract only, 1994. http://web4.library.adelaide.edu.au/theses/09PH/09phk638.pdf.

Full text
Abstract:
Bibliography : leaves 120-133. Defines the sources of reproductive wastage in FecB FecÊ Booroola Merino x South Australian Merino ewes and examines factors associated with the survival of embryos, fetuses and lambs with the aim of improving net reproduction efficiency. Experiments were conducted to define the problem; to examine factors affecting embryonic and fetal loss; and, to investigate factors influencing wastage at lambing.
APA, Harvard, Vancouver, ISO, and other styles
3

Knights, Marlon. "Induction of fertile estrus during seasonal anestrus in ewes and fall born ewe lambs." Morgantown, W. Va. : [West Virginia University Libraries], 2001. http://etd.wvu.edu/templates/showETD.cfm?recnum=1938.

Full text
Abstract:
Thesis (Ph. D.)--West Virginia University, 2001.
Title from document title page. Document formatted into pages; contains viii, 160 p. : ill. (some col.). Vita. Includes abstract. Includes bibliographical references (p. 132-159).
APA, Harvard, Vancouver, ISO, and other styles
4

Van, Emon Megan. "Supplementing Metabolizable Protein to Ewes during Late Gestation: Effects on Ewe and Offspring Performance." Diss., North Dakota State University, 2013. https://hdl.handle.net/10365/26620.

Full text
Abstract:
We hypothesized that MP intake at or above requirements during late gestation would improve dam and offspring performance. In year 1, ewes received one of three isocaloric dietary treatments during late gestation: 60MP1: 60% of MP requirements; 80MP1: 80% of MP requirements; and 100MP1: 100% of the MP requirements on a DM basis during the last 4 weeks of gestation for a ewe bearing twins. Similarly, in year 2, ewes received one of three isocaloric dietary treatments during late gestation: 60MP2: 60% of MP requirements; 100MP2: 100% of the MP requirements; and 140MP2: 140% of MP requirements. Dam performance was positively impacted by supplementing MP at or above requirements by maintaining dam BW and BCS. However, milk production was not significantly altered by maternal MP intake during late gestation. In both years, maternal MP intake did not affect offspring performance from birth to weaning. Metabolizable protein intake in isocaloric diets during late gestation had little influence male offspring feedlot performance or carcass characteristics. A reduction in maternal MP intake during late gestation reduced wether lamb N retention, but maternal MP supplementation above requirements did not enhance N retention of wether offspring. The data from the current study suggests that feeding 100% of MP requirements during late gestation may have greatest positive impacts on female reproductive performance. This analysis was strictly to determine the profitability of wether offspring alone during the feedlot phase based on their BW entering the feedlot and their performance. The wethers born to ewes fed 60% of MP requirements were the most profitable in both years, due to reduced BW entering the feedlot and increased HCW at slaughter. Overall, increasing maternal MP intake above requirements during late gestation did not improve offspring performance compared with offspring from ewes consuming reduced MP during late gestation. Therefore, feeding ewes 100% of MP requirements during late gestation may be the most beneficial to ensure positive dam and offspring performance.
APA, Harvard, Vancouver, ISO, and other styles
5

Kiyma, Zekeriya. "Effects of feed restriction and dietary oil supplementation on reproduction in sheep." Laramie, Wyo. : University of Wyoming, 2005. http://proquest.umi.com/pqdweb?did=888862061&sid=1&Fmt=2&clientId=18949&RQT=309&VName=PQD.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Clarke, Linda Sue. "Breed group effects on pregnancy rate and ewe performance in different seasons of the year." Thesis, Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/53062.

Full text
Abstract:
Thirty-one Dorset (D), 24 Finnish Landrace (F), 35 Barbados Blackbelly x Dorset (BD), 10 Dorset x Finn (F), 24 Finn x Dorset (FD) and 35 grade Rambouillet (R) ewes were exposed to rams in various seasons. Ewes were born in 1979 or 1980; no R ewes were born in 1980. Ewes were bred in April, 1980 (APR80); November, 1980 (NOV80); August, 1981 (AUG81); May, 1982 (MAY82); and April, 1983 (APR83). Ewes born in 1980 entered the study in NOV80. The analytical model used to describe ewe performance included effects of ewe birth year (EBY), breed/EBY, season/EBY, breed x season/EBY and ewe (random).
Master of Science
APA, Harvard, Vancouver, ISO, and other styles
7

Wurst, Aimee Kathryn. "Effects of ovulation of aged follicles, pregnancy diagnosis by ultrasonography, and treatments during lactation on reproduction in ewes." Morgantown, W. Va. : [West Virginia University Libraries], 2007. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=5347.

Full text
Abstract:
Thesis (Ph. D.)--West Virginia University, 2007.
Title from document title page. Document formatted into pages; contains viii, 113 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 88-113).
APA, Harvard, Vancouver, ISO, and other styles
8

Kerr, Nancy Jean. "Occurrence, etiology and management of ringwomb in ewes." Morgantown, W. Va. : [West Virginia University Libraries], 1999. http://etd.wvu.edu/templates/showETD.cfm?recnum=964.

Full text
Abstract:
Thesis (M.S.)--West Virginia University, 1999.
Title from document title page. Document formatted into pages; contains v, 46 p. : ill. Vita. Includes abstract. Includes bibliographical references (p. 37-45).
APA, Harvard, Vancouver, ISO, and other styles
9

Tadich, N. A. "Studies on immunisation of ewes and lambs." Thesis, University of Liverpool, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.370843.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Ramadan, Ahmed A. "Immunophysiology of the uterus in cyclic ewes." Diss., This resource online, 1995. http://scholar.lib.vt.edu/theses/available/etd-06062008-155620/.

Full text
APA, Harvard, Vancouver, ISO, and other styles
11

Nottle, Mark Brenton. "Short-term nutrition and its effect on ovulation in the ewe." Title page, table of contents and summary only, 1988. http://web4.library.adelaide.edu.au/theses/09PH/09phn921.pdf.

Full text
APA, Harvard, Vancouver, ISO, and other styles
12

Kakar, Muhammad Azam. "Effect of peri-conceptional feed intake on early embryo development and fetal growth in the Merino ewe /." Title page, table of contents and abstract only, 2003. http://web4.library.adelaide.edu.au/theses/09ANP/09anpk138.pdf.

Full text
APA, Harvard, Vancouver, ISO, and other styles
13

Devonish, Ezra. "Does peripheral concentration of progesterone affect ovulation and lambing rates in Barbados Blackbelly ewes?" Morgantown, W. Va. : [West Virginia University Libraries], 2005. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=4178.

Full text
Abstract:
Thesis (M.S.)--West Virginia University, 2005.
Title from document title page. Document formatted into pages; contains ix, 61 p. : ill. Includes abstract. Includes bibliographical references (p. 49-61).
APA, Harvard, Vancouver, ISO, and other styles
14

Dixon, Alison Brown. "Late embryonic and fetal mortality in the ewe." Morgantown, W. Va. : [West Virginia University Libraries], 2003. http://etd.wvu.edu/templates/showETD.cfm?recnum=3042.

Full text
Abstract:
Thesis (Ph. D.)--West Virginia University, 2003.
Title from document title page. Document formatted into pages; contains xii, 180 p. : ill. Vita. Includes abstract. Includes bibliographical references (p. 135-179).
APA, Harvard, Vancouver, ISO, and other styles
15

Huntley, Selene J. "Longitudinal studies of intramammary infection in suckler ewes." Thesis, University of Warwick, 2013. http://wrap.warwick.ac.uk/57216/.

Full text
Abstract:
Four longitudinal studies were conducted. The first study investigated the longitudinal pattern of udder half somatic cell count (HSCC) and intramammary infection (IMI) in 48 UK suckler ewes over the first 10 weeks of lactation. This was the first study to demonstrate that HSCC of suckler ewes followed a quadratic and cubic relationship with days in lactation over the first 10 weeks of lactation. Udder half somatic cell count was also explained by presence of bacteria. Ewes older than 6 years of age had significantly higher HSCC than younger ewes. The second study investigated the relationships between udder conformation, SCC and lamb weight. Whilst accounting for lamb age and birth weight, significantly lower lamb weight was associated with a ewe SCC of >400,000 cells/ml (-1.7 kg), a traumatic teat lesion (bite, tear or chapping) 2 weeks previously (-1.1 kg), and a ewe body condition score (BCS) of <2.5 before lambing (-1.3kg). Higher HSCCs were observed in ewes with a lower suspended udder, and older ewes in poorer body condition. The findings from this study make an important contribution to the knowledge of the impact of udder health of suckler ewes by demonstrating that udder conformation is associated with IMI and that IMI and teat damage are negatively associated with lamb weight. The third study investigated the effect of dry cow therapy (DCT) on subclinical mastitis in a lowland flock with a low incidence of clinical mastitis by recording HSCC and lamb weights in the following lactation. To the author’s knowledge, there are no published reports of the effect of broad spectrum DCT on subclinical mastitis in suckler ewes in the literature. No significant effect was found between the use of DCT and HSCC or lamb weight in the subsequent lactation. The fourth study was a randomised controlled trial to assess the effect of DCT on clinical mastitis in a suckler flock with a high level of clinical mastitis. Dry cow treatment significantly reduced the incidence of clinical mastitis over one year, with a 70% reduction of clinical mastitis in ewes that received treatment from 6.2% to 1.8%. This was the first field trial to investigate and demonstrate the clinical benefit of the use of a broad spectrum DCT in suckler ewes. These studies have enhanced our knowledge of longitudinal patterns of infection and demonstrated the importance of udder health for optimising production of suckler ewes. Factors to control for when using SCC as a tool to measure intramammary infection were described.
APA, Harvard, Vancouver, ISO, and other styles
16

Meade, Brian J., and mikewood@deakin edu au. "Semiochemicals in merino ewes: Field effects and chemical identification." Deakin University. School of Sciences, 1986. http://tux.lib.deakin.edu.au./adt-VDU/public/adt-VDU20050815.112723.

Full text
APA, Harvard, Vancouver, ISO, and other styles
17

Partington, Elizabeth Claire. "Influence of nutrition on parasitism in periparturient dairy ewes." Thesis, Open University, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.418468.

Full text
APA, Harvard, Vancouver, ISO, and other styles
18

McKenzie, Nancy Kae. "Determinants of reproduction in young bighorn ewes (ovis canadensis)." Mémoire, Sherbrooke : Université de Sherbrooke, 2003. http://savoirs.usherbrooke.ca/handle/11143/4601.

Full text
APA, Harvard, Vancouver, ISO, and other styles
19

Suyapa, Fortin. "Relationships among progesterone, estradiol-17[beta], 13, 14- dihydro-15-keto-prostaglandin F₂a and prostaglandin F₂a in intact ewes around the time of luteolysis /." This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-11252009-020010/.

Full text
APA, Harvard, Vancouver, ISO, and other styles
20

Ungerfeld, Rodolfo. "Reproductive responses of anestrous ewes to the introduction of rams /." Uppsala : Dept. of Clinical Chemistry, Swedish Univ. of Agricultural Sciences, 2003. http://epsilon.slu.se/v163.pdf.

Full text
APA, Harvard, Vancouver, ISO, and other styles
21

Joyce, Ieuan Michael. "Ovarian responses of ewes to growth hormone and gonadotrophin treatment." Thesis, University of Nottingham, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243681.

Full text
APA, Harvard, Vancouver, ISO, and other styles
22

Yang, K. P. "Opiod-mediated luteinizing hormone control in ewes : ovarian steroid involvement." Thesis, University of Nottingham, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376405.

Full text
APA, Harvard, Vancouver, ISO, and other styles
23

Fergani, Chrysanthi. "Hormone, behaviour and neuropeptide profiles of normal and stressed ewes." Thesis, University of Liverpool, 2011. http://livrepository.liverpool.ac.uk/4173/.

Full text
Abstract:
The aim of the present study was to investigate the hormone, sexual behaviour and neuropeptide profiles of follicular phase ewes and examine alterations after the application of acute stressors. In study 1, follicular phases of intact ewes were synchronised with progesterone vaginal pessaries. Ewes then received saline vehicle, insulin (4 iu/kg) or endotoxin (LPS; 100ng/kg) at 28h after progesterone withdrawal (PW; time zero). In study 2, this protocol was repeated, but animals were killed at 0h, 16h, 31h and 40h after PW and brain tissue retrieved. In study 1, there was a delay of 17.6h and 7.2h (P<0.05), respectively, in half the insulin-treated animals (‘insulin-delayed’) but not in the other half; and a delay of 22.5h and 20.7h (P<0.001), respectively, in all LPS-treated animals. Plasma oestradiol concentrations decreased after both stressors (P<0.001) and cortisol increased in all groups (P<0.05); whereas progesterone increased in the insulin-delayed and LPS groups only (P<0.05). In study 2, immunohistochemistry was used to examine transcriptional activation (co-expression with c-Fos) of various neuropeptides in the hypothalamus and preoptic area. In control ewes, the maximum percentage of dynorphin cells co-localising c-Fos (i.e., activated) was observed at 31h after PW (52%; P<0.05), whereas maximum activated kisspeptin and neurokinin B cells occurred at 40h after PW (49 and 42%, respectively; P<0.05). The percentage of activated dopamine cells decreased before the onset of sexual behaviour (from 70 to 26%; P<0.05) whereas β-endorphin activation was lower during the LH surge (from 41 to 10%; P<0.05). In contrast, neuropeptide Y and somatostatin activation was higher during the surge (from 21 to 36%; P<0.08; and from 14 and 9% to 47 and 73%, respectively; P<0.05). However, LPS decreased the percentage of activated dynorphin cells (to 11%; P<0.05) and kisspeptin cells (to 22%; P<0.05). On the contrary, insulin decreased the percentage of activated dynorphin cells (to 27%) in two of the insulin-treated animals (insulin-responders) but not in the other two; whereas the percentage of activated kisspeptin cells increased in all insulin-treated animals (52%; P<0.05). Neurokinin B was not altered by either treatment. Furthermore, insulin increased the percentage of activated β-endorphin, neuropeptide Y and somatostatin cells in the ARC (to 71, 72 and 63%, respectively, P<0.05) but LPS did not have the same effect. In the VMN, activation of somatostatin cells was greater in all LPS treated animals (from 8 to 27%; P<0.05) but only in two of the insulin-treated animals (to 55 and 76%; insulin-responders) but not in the other two (to 5 and 6%; insulin-non-responders). These results indicate that there is a specific hormonal, behavioural and neuropeptide pattern during the follicular phase of intact ewes and this is disturbed by acute LPS or insulin administration in the late follicular phase, leading to the disruption of the LH surge.
APA, Harvard, Vancouver, ISO, and other styles
24

Evans, Ronald Cole. "Selected Parameters of Reproduction in Rambouillet and St. Croix Ewes." DigitalCommons@USU, 1987. https://digitalcommons.usu.edu/etd/4092.

Full text
Abstract:
Experiments were conducted to determine the genetic reproductive potential of Rambouillet and St. Croix ewes . Ovulation rate (monthly) and estrus (daily) were observed for two years on 10 ewes of each breed to establish seasonal patterns . Both breeds demonstrated seasonal anestrus from May through July. Ovulation rates reached 2.0 or greater for both breeds during September to November, and decreased to 1.25 by March. Breeding groups for St. Croix and Rambouillet ewes were bred each February and August for five years to establish lambing performance at six month intervals. Age at first lambing was earlier for St. Croix than Rambouillet (89% vs 0.0% lambing at 12 months of age). Both breed and age influenced lambing rate. Fifty-two of 108 (48%) lambings from mature St. Croix ewes occurred at six month intervals, compared to 1 of 85 for Rambouillet ( 1.2%}. No Rambouillet under 36 months lambed at 6 month interval, while 8 of 61, 12 month St. Croix ewes lambed at a 6 month interval (13.1%). Mature St. Croix ewes that lambed at six month intervals produced 3.44 lambs per year, compared to 2.03 for ewes that lambed once a year. Parturition interval was 262 days for mature and 302 days for 24 month and younger St. Croix ewes on a six month lambing schedule. Parturition interval for mature Rambouillets was 355 days. Blood samples were taken twice weekly and serum progesterone measured by RIA in 17 St. Croix and four Rambouillet ewes that lambed during the normal breeding season, to determine occurrence of postpartum ovulation. Average days to first postpartum ovulation was 35.8 and 35.6 for St. Croix and Rambouillet, respectively. Thirteen of seven teen (76.5%) St. Croix ewes showed estrus with first ovulation, while none of the Rambouillet showed estrus with first or second postpartum ovulation. The shortened postpartum period for St. Croix compared to Rambouillet (40 .2 vs > 70 days) was a result of estrus accompanying the first or second postpartum ovulation.
APA, Harvard, Vancouver, ISO, and other styles
25

Atkinson, S. "The characterisation of induced ovarian follicles in seasonally anoestrous ewes." Thesis, Atkinson, S. (1985) The characterisation of induced ovarian follicles in seasonally anoestrous ewes. PhD thesis, Murdoch University, 1985. https://researchrepository.murdoch.edu.au/id/eprint/53361/.

Full text
Abstract:
The overall objectives of this project were to characterise the effect of· two known stimuli of the reproductive system on ovarian activity in seasonally anoestrous ewes, and to determine the hormonal patterns that accompany ovarian changes through the transition from seasonal quiescence to follicular activity. To characterise the ovarian and hormonal changes that occur, measurements were made of: (1) the concentrations of circulating gonadotropins, (2) the concentration of oestradiol from the ovarian venous effluent, ( 3) the recruitment (antrum formation), growth and maturation of ovarian follicles, (4) the steroid production from the induced follicles and (5) the presence of gonadotropin receptors in the granulosa cell layer of the follicles; through this transition...
APA, Harvard, Vancouver, ISO, and other styles
26

Sumbung, Frederick Patta. "Ovarian function and response in prepubertal ewes through to puberty." Thesis, Sumbung, Frederick Patta (1985) Ovarian function and response in prepubertal ewes through to puberty. PhD thesis, Murdoch University, 1985. https://researchrepository.murdoch.edu.au/id/eprint/53694/.

Full text
Abstract:
The objectives of this study were to assess ovarian function and responses to various reproductive stimuli in prepubertal ewe lambs, and to determine the hormonal patterns that accompany follicular activity through to puberty. Hormonal changes and occurence of oestrus were monitored in a group of young ewe lambs to establish at what age and bodyweight puberty occurred. A number of stimuli were then used to provoke ovarian and reproductive activity in groups of prepubertal ewe lambs. Groups of ewe lambs were either placed with a ram, fed monensin supplement, primed with progesterone or challenged with FSH-P. Blood samples were collected to measure hormone levels and the lambs were ovariectomized to determine ovarian morphology and function. Follicles were dissected from the ovaries, antral fluid collected and the follicles were incubated in culture medium to measure steroid production. Gonadotrophin binding site present in the granulosa cells of the stimulated follicles was also quantified. The natural onset of puberty in Corriedale ewe lambs was attained at the age of 40-42 weeks with a threshold bodyweight of 34-36 kg in the breeding season. Response of ewe lambs to the introduction of a ram seemed to depend on their age. ewe lambs aged 20-24 weeks showed no response whereas ewe lambs aged 34-36 weeks responded with increased LH pulse frequency and an LH surge which occured within 24 hours. The LH surge was followed by a transient increase in peripheral progesterone levels which lasted for 2-3 days, suggesting that ovulation had occurred but the resultant corpora lutea were short lived. Monensin supplementation stimulated ovarian function with an increase in the number of small follicles and an increase in the antral fluid oestradiol content of large follicles. Progesterone priming caused an increase in oestradiol secretion into culture medium by large follicles. Withdrawal of progesterone treatment resulted in an increase LH pulse frequency. Neither of these treatments stimulated follicular maturation nor an LH surge. After FSH stimulation, ewe lambs in control, monensin supplemented and progesterone-primed group showed a sharp increase in plasma LH levels. In control lambs the peak LH levels occured at intervals ranging from 12 h to 36 h after the initiation of FSH treatment, whereas in the progesterone-primed lambs the LH peak was later with tighter synchronization (36h to 42h). The monensin supplemented lambs showed an intermediate increase in LH levels with less synchrony (24h to 36h) than the progesterone-primed lambs following this FSH treatment. Both monensin supplemented and progesterone-primed lambs had a higher LH peak than control ewe lambs. Ovariectomy after the LH surge but before ovulation showed that ovarian weight in progesterone-primed ewes was greater than in either control or monensin supplemented lambs. FSH treatment stimulated an increase in the development of large follicles in monensin supplemented and progesterone-primed ewe lambs. Follicles > 7mm in diameter secreted high levels of progesterone into culture medium, indicating that there was a shift in the steroidogenic capacity of the preovulatory follicles. Antral fluid from follicles of control lambs contained high levels of testosterone. Monensin supplementation and progesterone priming stimulated an increase gonadotrophin binding sites in granulosa cells after FSH in treatment. Studies on ovaries removed after ovulation showed that monensin supplemented and progesterone-primed ewe lambs had more ovulations after FSH treatment and had significantly more functional corpora lutea 12 days after FSH treatment. Increased ovulations and increased numbers of functional corpora lutea were both associated with increased gonadotrophin binding sites. These result indicate a possible mechanism for the known influence of progesterone priming on the persistence of corpora lutea in ewes.
APA, Harvard, Vancouver, ISO, and other styles
27

Wilkinson, Stephen Charles. "The effect of silage dry matter and pattern of feeding during pregnancy on the performance of housed breeding ewes." Thesis, Queen's University Belfast, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.236417.

Full text
APA, Harvard, Vancouver, ISO, and other styles
28

Basiouni, Ghazi Faisal. "Preovulatory follicle development and defective luteal function in sheep." Thesis, University of Nottingham, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.262149.

Full text
APA, Harvard, Vancouver, ISO, and other styles
29

Holásková, Ida. "Effect of peptidoglycan-polysaccharide complex on reproductive efficiency and mastitis in sheep." Morgantown, W. Va. : [West Virginia University Libraries], 2002. http://etd.wvu.edu/templates/showETD.cfm?recnum=2595.

Full text
Abstract:
Thesis (M.S.)--West Virginia University, 2002.
Title from document title page. Document formatted into pages; contains vii, 72 p. : ill. (some col.). Vita. Includes abstract. Includes bibliographical references (p. 58-71).
APA, Harvard, Vancouver, ISO, and other styles
30

Nix, Erin Elizabeth. "Effect of swath grazing on forage intake and wastage by ewes." Thesis, Montana State University, 2012. http://etd.lib.montana.edu/etd/2012/nix/NixE0512.pdf.

Full text
Abstract:
Sixty non-pregnant and non-lactating mature white faced ewes (Targhee 65.4 ± 5.84 kg BW in 2010 and Rambouillet 61.9 ± 6.28 kg BW in 2011) were used in a 2-yr study to evaluate intake, forage wastage, and nutrient composition of a pea/barley forage fed either as baled hay in confinement (CONFINEMENT) or swathed and left to graze (GRAZE). Forage DMI was estimated using IVDMD and chromic oxide as an external marker for estimating fecal output. Forage wastage was estimated by sampling and weighing the initial swath, standing, and baled forage, and weighing the forage again after a 7-d collection period, and subtracting the estimated forage DMI. Samples of baled, swathed, and any standing forage were collected in August and October and analyzed for DM, OM, CP, NDF, ADF, and in situ dry matter digestibility (ISDMD). There was no treatment by year interaction (P = 0.56) for BW change and no difference (P = 0.33) between treatments. There was a treatment by year interaction (P = 0.04) for DMI. In 2010, DMI was greater (P = 0.06) by CONFINEMENT ewes compared to GRAZE ewes (2.4 vs 1.7 kg x ewe -&#185; x d -&#185); however, in 2011, DMI did not differ (P = 0.25) between treatments. There was no treatment by year interaction (P > 0.22) for forage wastage either as a percent of beginning available forage or as kilograms of wastage. Although percentage wastage did not differ between treatments (P = 0.23), kilograms of wastage was greater (P = 0.03) for GRAZE than CONFINEMENT. For both years in the swathed forage, ISDMD and OM decreased while NDF and ADF increased. In 2010 CP increased, but in 2011 it remained the same. For both years in the baled forage, CP decreased while ISDMD and NDF increased. In 2010, ADF decreased and OM increased, but in 2011 ADF increased and OM decreased. Although nutrient content was lower in the swath, wastage and animal performance did not differ between the treatments. This research provides a sound biological basis for an economic assessment of using swath grazing in commercial sheep operations.
APA, Harvard, Vancouver, ISO, and other styles
31

O'Connell, Anne R., and n/a. "Heritability and phenotypic analysis of high embryonic survival in prolific ewes." University of Otago. Department of Anatomy & Structural Biology, 2009. http://adt.otago.ac.nz./public/adt-NZDU20091009.160105.

Full text
Abstract:
A significant proportion of potential lambs are lost (commonly 15-20%) between ovulation and day 30 of gestation. Moreover, little is known about factors associated with multiple birth capacity of the uterus which would be necessary to convert gains in ovulation rate to the birth of live lambs. This project has investigated the relationship between maternal uterine and hormonal environment as well as the heritability of embryonic survival (ES) in prolific ewes. Litter size (LS) from known ovulation rate (OR) records (n=6393) collected over 16 years were analysed for heritability. ASReml analysis reported ES to be a trait of low repeatability (r� = 0.103) and heritability (h� = 0.04) which is consistent with earlier studies of this trait. However, pedigrees of outlier animals indicated a segregation pattern consistent with a single autosomal gene with a major affect on enhanced ES. From this flock, closely related high ovulation rate ewes with significantly different litter sizes (High ES; OR2.6/LS2.4 versus Low ES; OR2.9/LS1.6) were selected for further study. The anatomy and gene expression of the uterus collected at day 14 of the oestrous cycle (n=5 High and n=5 Low ES ewes) and day 16 of gestation (n=14 high and n=10 Low ES ewes) as well as systemic concentrations of hormones indicative of uterine (activin-A, follistatin) and ovarian (inhibin-α, progesterone) function during the oestrous cycle and early gestation were compared. Progesterone concentrations were found to rise earlier in high ES ewes with a difference in number of ewes with detectable levels of progesterone apparent by day 4 of gestation. The peak concentration and slope of progesterone increase as well as plasma profiles of oestradiol and inhibin-α were not different between groups. A number of pathways worthy of closer investigation were implicated by microarray analysis with Ingenuity Pathway Analysis, Pubmatrix, and candidate gene approaches. In particular, the altered expression of many immune cell factors suggests that high ES ewes have maternal gene expression of the inflammatory pathways favourable to embryo implantation. The plasma concentration of activin, but not follistatin, was found to be significantly higher in low ES ewes, a difference that remained apparent when the concentration of follistatin was corrected for individual samples. Furthermore, the concentration of activin, but not follistatin, was significantly elevated on day 16 of gestation in the uterine fluid of low ES ewes. Further investigation of the pattern of gene expression during the oestrous cycle and early gestation (day10-16 oestrus and days10-20 gestation) revealed that a significant increase in follistatin mRNA in the luminal epithelia and interacting trophoblast cells of the embryo occurs on day 18 and 20 of gestation. It is likely the appropriate balance between activin and follistatin during the time of implantation enhances embryonic survival in this line of ewes. This may be secondary to or concomitant with the observed earlier rise in progesterone concentration. The implication that embryo survival may be positively influenced by a single autosomal gene has important implications for New Zealand's agricultural industry.
APA, Harvard, Vancouver, ISO, and other styles
32

Lewis, Ronald Martin. "Reproductive performance of dorset ewes in the star accelerated lambing system." Diss., This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-08252008-162636/.

Full text
APA, Harvard, Vancouver, ISO, and other styles
33

Brindley, Marla Faye. "Evaluation of Milk Production in Western Whiteface and Navajo-Churro Ewes." DigitalCommons@USU, 1995. https://digitalcommons.usu.edu/etd/3888.

Full text
Abstract:
Western Whiteface and Navajo-Churro Ewes, two types of sheep present in the Intermountain West, were compared for their milk production ability. Amount of milk produced per individual and the group milk composition were analyzed for butterfat, lactose, somatic cell count, protein, calcium, and phosphorous. Ewes were fed ad libitum alfalfa hay and had access to free-choice grain while in the milking parlor. Lambs were weaned at 35 d of age and removed to another holding area and placed on creep feed . Ewes were milked for 90 d following the weaning of the lambs. Western Whiteface ewes had a much higher milk production level than the Navajo- Churro ewes (P < 0.05). Western Whiteface ewes were almost double in their overall level of production versus the Navajo-Churro ewes. Half of the Western Whiteface ewes completed the 90-d lactation period, producing an average of . 83 kg of milk per day. Navajo-Churro ewes did not complete the full lactation period, with I 000/o of them ceasing milk production before completion of the 90-d milking period. The criterion for being considered dry consisted of completing six consecutive milkings while producing 50 ml or less of milk. Overall production for the two groups of ewes was .83 kg/day of milk for the Western Whiteface ewes and .52 kg/day for the Navajo-Churro. The average number of days in production for the Western Whiteface ewes was 69.5 d and 50 d for the Navajo-Churro. Western Whiteface ewes consistently exhibited higher milk production levels than the Navajo- Churro ewes and they adapted well to the milking barn. Navajo-Churro ewes did not produce an adequate quantity of milk for a dairy setting.
APA, Harvard, Vancouver, ISO, and other styles
34

Jabbar, Ghulam. "Melengestrol acetate and norgestomet for the induction of synchronized estrus in seasonally anovular ewes." Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-06232009-063050/.

Full text
APA, Harvard, Vancouver, ISO, and other styles
35

Smith, Darron Louis. "The effect and mechanism of action of volatile fatty acids on the catabolism of progesterone." Morgantown, W. Va. : [West Virginia University Libraries], 2005. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=4243.

Full text
Abstract:
Thesis (Ph. D.)--West Virginia University, 2005.
Title from document title page. Document formatted into pages; contains x, 88 p. : ill. Vita. Includes abstract. Includes bibliographical references.
APA, Harvard, Vancouver, ISO, and other styles
36

Hughes, J. I. "The effect of nematode parasitism on lactation in the ewe." Thesis, University of Newcastle Upon Tyne, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.383975.

Full text
APA, Harvard, Vancouver, ISO, and other styles
37

Johnson, F. W. A. "Studies on Chlamydia psittaci associated ovine foetopathy in the United Kingdom." Thesis, University of Liverpool, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372676.

Full text
APA, Harvard, Vancouver, ISO, and other styles
38

Perea-Ganchou, Fernando P. "Role of endothelin 1 in follicular and luteal function in the sheep." Morgantown, W. Va. : [West Virginia University Libraries], 2009. http://hdl.handle.net/10450/10387.

Full text
Abstract:
Thesis (Ph. D.)--West Virginia University, 2009.
Title from document title page. Document formatted into pages; contains x, 158 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 126-158).
APA, Harvard, Vancouver, ISO, and other styles
39

Mankey, Julie E. "Effects of the oxytocin receptor blocker, atosiban, on function of ovine corpora lutea and responses to prostaglandin F₂ alpha." Morgantown, W. Va. : [West Virginia University Libraries], 2009. http://hdl.handle.net/10450/10545.

Full text
Abstract:
Thesis (M.S.)--West Virginia University, 2009.
Title from document title page. Document formatted into pages; contains viii, 61 p. : ill. (some col.). Vita. Includes abstract. Includes bibliographical references (p. 39-52).
APA, Harvard, Vancouver, ISO, and other styles
40

Costine, Beth Alyson. "Evidence for a systemic embryotoxic effect of early luteal regression in the ewe." Morgantown, W. Va. : [West Virginia University Libraries], 2000. http://etd.wvu.edu/templates/showETD.cfm?recnum=1733.

Full text
Abstract:
Thesis (M.S.)--West Virginia University, 2000.
Title from document title page. Document formatted into pages; contains viii, 58 p. : ill. (some col.). Vita. Includes abstract. Includes bibliographical references (p. 42-56).
APA, Harvard, Vancouver, ISO, and other styles
41

Costine, Beth Alyson. "Mechanisms of reduced luteal sensitivity to PGF₂[alpha] in ruminants." Morgantown, W. Va. : [West Virginia University Libraries], 2004. https://etd.wvu.edu/etd/controller.jsp?moduleName=documentdata&jsp%5FetdId=3737.

Full text
Abstract:
Thesis (Ph. D.)--West Virginia University, 2004.
Title from document title page. Document formatted into pages; contains xiii, 119 p. : ill. Vita. Includes abstract. Includes bibliographical references (p. 95-118).
APA, Harvard, Vancouver, ISO, and other styles
42

Horr, Mônica. "Efeitos do propofol associado ou não ao midazolam, fentanil ou xilazina, na anestesia em ovelhas pré-medicadas com acepromazina /." Jaboticabal, 2019. http://hdl.handle.net/11449/183318.

Full text
Abstract:
Orientador: Newton Nunes
Banca: Patricia Cristina Ferro Lopes
Banca: Paula Ferreira da Costa
Banca: Paulo Aléscio Canola
Banca: Bruno Watanabe Minto
Resumo: Objetivou-se comparar os efeitos do propofol isolado ou associado ao midazolam, fentanil ou xilazina, na indução da anestesia em ovelhas pré-medicadas com acepromazina. Foram utilizados oito animais (n=8) que compuseram quatro grupos, denominados GP, GMP, GFP e GXP, os quais diferenciaram-se de acordo com o protocolo experimental recebido, como segue: propofol isolado, propofol e midazolam (0,2 mg/kg), propofol e fentanil (5 g/kg) ou propofol e xilazina (0,1 mg/kg), pela via intravenosa, respectivamente. O propofol foi admnistrado posteriormente ao bolus, quando presente, e a dose foi calculada pelo volume infundido. As ovelhas participaram de todos os grupos, respeitando um intervalo de sete dias entre os tratamentos. Foram mensurados parâmetros hemogasométricos e cardiorrespiratórios. Tais dados foram coletados antes da sedação sem qualquer utilização de fármacos, definido como momento basal (Mbasal), 15 minutos após a administração de acepromazina (M15), imediatamente após a indução anestésica, onde realizou-se a intubação (Mint0), 5 minutos após (Mint5), imediatamente após a extubação (Mext0), 10, 20 e 30 minutos após a extubação (Mext10, Mext20 e Mext30), respectivamente. Adicionalmente foram dosados os valores de lactato e glicemia nos momentos Mbasal, M15, Mint0, Mext0 e Mext30. Complementarmente, foram avaliados o período de recuperação e escores de qualidade de intubação e recuperação. A dose do propofol necessária para a intubação orotraqueal foi mensurada em todos... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: The aim of the present study was to compare the effects of popofol alone or in association with midazolam, fentanyl or xylazine for induction anesthesic in sheep pre-medicated with acepromazine. Eight animals (n = 8) were distribuited in four groups: GP, GMP, GFP and GXP, according to the experimental protocol, as follows: propofol, propofol and midazolam (0.2mg/kg), propofol and fentanyl (5 g/kg) or propofol and xylazine (0.1mg/kg), intravenously, respectively. Propofol was administered post bolus, when present, and the dose was calculated by volume infused. The sheeps participated in all groups, respecting a seven-day interval between treatments. Blood gas and cardiorespiratory parameters were measured. These data were collected before sedation and defined as baseline (Mbasal), 15 minutes after acepromazine (M15), immediately after anesthetic induction, where an intubation was performed (Mint0), 5 minutes after (Mint5), immediately after extubation (Mext0), 10, 20 and 30 minutes after extubation (Mext10, Mext20 and Mext30), respectively. In addition, lactate and glucose values were measured at Mbasal, M15, Mint0, Mext0 and Mext30. Recovery period and intubation and recovery quality scores were evaluated. The dose of propofol required for orotracheal intubation was recorded. Data with Gaussian distribution were analyzed statistically by analysis of variance (Two-way ANOVA) followed by the Tukey test. For the evaluation of non-parametric data, the results were analyzed by Kr... (Complete abstract click electronic access below)
Doutor
APA, Harvard, Vancouver, ISO, and other styles
43

Xu, Yiqun. "Effects of ovariectomy and of exogenous progesterone on placental production of progesterone in the pregnant ewe." Thesis, The University of Sydney, 1987. https://hdl.handle.net/2123/26009.

Full text
Abstract:
In viviparous species pregnancy and its successful termination is dependent upon a critical interplay between hormones produced by the ovary, maternal pituitary, uterus, foetus and its associated membranes. In general, it is the foetus which keeps the mother pregnant and it is the foetus which is primarily responsible for initiating the processes necessary for parturition. Sheep, because of their availability and relative cheapness, have been widely used in research into reproductive biology. Much more is known of the hormone status during pregnancy and parturition in the ewe than in the females of other farm animals.
APA, Harvard, Vancouver, ISO, and other styles
44

Dow, Tina Lynn. "Effects of induced acute phase response in ewes on early embryo survival." Morgantown, W. Va. : [West Virginia University Libraries], 2008. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=5616.

Full text
Abstract:
Thesis (M.S.)--West Virginia University, 2008.
Title from document title page. Document formatted into pages; contains vii, 68 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 46-68).
APA, Harvard, Vancouver, ISO, and other styles
45

El-Ebissy, Eman. "Relationship between Metabolic Parameters and TNFα in the Peripartal Period in Ewes." Doctoral thesis, Universitätsbibliothek Leipzig, 2011. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-70051.

Full text
Abstract:
Pregnancy toxaemia (ketosis) is a metabolic disease of ewes which occurs during the late gestation as a result of the inability of the pregnant ewe to maintain an adequate energy balance for the fast growing maternal fetal unit. As a result of energy defi-ciency mobilization of lipid reserves results in a doubling of the plasma free fatty acid (FFA) giving rise to fatty liver and increased ketone bodies β-hydroxybutyrate (BHB) in blood and urine. It is associated with a higher rate of mortality and causes severe economic losses. The objective of this study was directed at investigating the relationship between metabolic parameters and cytokine TNFα, to check the interaction between the TNFα and fat metabolism in late pregnant ewes of different breeds, and whether TNFα play a role in the pathogenesis of pregnancy toxaemia, which may serve as marker to early diagnosis of the disease. In this study, 29 pregnant and clinically healthy ewes (16 Merino, 13 Blackhead) were selected out of a flock of sheep. Blood samples were collected at 5, 3, and 1 week be-fore parturition (b.p.) and also 4 weeks after parturition (a.p.). The average numbers of lambs were 2.18 and 1.58 /ewe for Merino and Blackhead breeds respectively. The blood samples were analyzed for the following:  Concentration of metabolic parameters: glucose, insulin, free fatty acids (FFA), β-hydroxybutyrate (BHB), albumin, total protein (TP), iron (Fe), glutamat-dehydro-genase (GLDH), creatin kinase (CK), gamma-glutamyl-transferase (GGT), choles-terol, haptoglobin.  Haematological parameters: Haematocrite (HK), haemoglobin concentration (HB), erythrocyte count (EC), leukocyte count (LC), mean corpuscular volume (MCV), mean corpuscular haemoglobin (MCH), mean corpuscular haemoglobin concentration (MCHC).  Cytokine TNFα by using ovine TNFα ELISA assay. The results of glucose concentration of pregnant ewes showed significant increase (3.8 mmol/l) in five weeks b.p. and declined with advancing gestation (2.6 mmol/l) one week b.p. Insulin concentration remained constant with an average of 0.11 nmol/l b.p., and then significantly increased to 0.22 nmol/l four weeks a.p. Maximal FFA concentrations were found at five weeks b.p. (976 µmol/l). The levels of FFA showed high levels b.p. compared with reference range (R.R. < 600 µmol/l), and the FFA levels significantly decreased postpartum (four weeks b.p.). while there was significant increasing (p<0.05) in the level of FFA in Merino sheep than in Black-head sheep b.p. On the other hand there was no significant difference a.p. The mean values of BHB in all periods of sampling, period 1(5 w.b.p.), period 2 (3 w.b.p.), period 3 (1 w.b.p.), and period 4 (4 w.a.p.) were 0.37 mmol/l, 0.23 mmol/l, 0.17 mmol/l and 0.3 mmol/l respectively. The mean of BHB indicated normal levels of BHB before and after parturition compared to subclinical ketosis (BHB > 1 mmol/l) and clinical ketoses (BHB > 1.6 mmol/l), and there was a significant difference (p<0.05) in the values of BHB between Blackhead and Merino breeds before parturi-tion while there was no significant difference after parturition. The concentration of TNFα showed elevated levels in all period of sampling before parturition. The TNFα values were 30.4 (17.2, 785.0) ng/ml (median, first, and third quartiles), 35.6 (13.6, 54.3), and 26.6 (13.0, 39.9) ng/ml in period 1(5 w.b.p.), period 2 (3 w.b.p.), and period 3 (1 w.b.p.) respectively. These values decreased to 19.1 (9.9, 33.8) ng/ml at 4 weeks after parturition. Statistical analysis showed that there was a positive correlation between free fatty ac-ids and TNFα. This correlation means that adipose tissue produces TNFα causing insu-lin resistance, which stimulates the lipolysis and leads to an increase of circulatory free fatty acids levels. It is concluded that fat mobilization occurs in the prepartum clinically healthy ewes with a significant increase in the levels of FFA, and also there is an increase in the proinflammatory cytokine TNFα at late gestation which predisposes ewes to pregnancy toxaemia and can aid in the diagnosis of the disease.
APA, Harvard, Vancouver, ISO, and other styles
46

Akoto, Johnny Yao. "Christian education and nation building: promoting ethnicity and identity among the Ewes in Atlanta, Georgia through the study of Ewe language and culture." DigitalCommons@Robert W. Woodruff Library, Atlanta University Center, 1999. http://digitalcommons.auctr.edu/dissertations/616.

Full text
Abstract:
A Ghanaian proverb in Akan language says, obi nkyere akwadaa Onyame. This literally means nobody shows a child who God is. Naturally, the child grows up into this knowledge of God. This growth is spontaneous through informal education embedded within the child's mother tongue and the culture within which he or she was born. Our culture is rich with various attributes to God. Such attributes are proverbial and also observed in the names given to people. With the lack of knowledge of the child's mother tongue, the language and culture that carry these attributes to God, the child is deprived of the knowledge of God. The problem of modernization and easy movement of people from one place to another in quest of economic, political, educational or religious prosperity or freedom has divorced people from their mother tongues and culture. Thus plunged into foreign cultures and languages, unforeseen social problems leading to frustration and isolation are created. Such problems ostracize people making them strangers to their homelands. Future generations have a total loss of the mother tongue since they only communicate in the foreign language of their residence. My project which is promoting ethnicity and identity among Ewes in Atlanta, Georgia through the study of Ewe language and culture is one way of addressing the above problem facing most immigrants in foreign lands. I started a center of worship and the study of Ewe language and culture here in Atlanta. The center provides opportunities for learning of the language and culture which are largely used in worship. This type of fellowship galvanizes the Ewes in Atlanta, and provides a platform for the learning and speaking of the language and putting cultural values in practice. It is a proof-text that we can be bilingual and bi-cultural as resident aliens. It is a call to end unconscious child-cultural abuse committed by parents who do not take pains to teach their children the mother tongue and the culture of their origin. To submit a child to a culture that diminishes the child's self-worth or self-esteem is tantamount to child-cultural abuse which this project seeks to address.
APA, Harvard, Vancouver, ISO, and other styles
47

Bass, Jacqueline. "Effect of litter size, dietary protein content, ewe genotype and season on milk production and associated endocrine and blood metabolite status of ewes." Thesis, University of Edinburgh, 1988. http://hdl.handle.net/1842/26258.

Full text
Abstract:
In a series of experiments, ewe milk production and associated plasma hormone and blood metabolite status were investigated. Separate comparisons were made between ewes suckling either single (S ewes) or twin (T ewes) lambs, ewes lambing in either January or April, ewes fed either 150 g (low) or 210 g (high) of crude protein/kg DM in the diet and between ewes of the East Friesland (EF) and Scottish Blackface (SBF) genotypes. In all comparisons milk yields, live weight, body condition score changes, fat, protein and ash contents and energy values of milk were determined weekly. Blood samples were collected on one day each week, at 20 minute intervals for 2 hours, prior to feeding. Samples were pooled within each week and each animal. Plasma glucose, non- esterified fatty acids (NEFA), 3-hydroxybutyrate (3-OHB), urea, albumin, protein, insulin, growth hormone (GH), cortisol, prolactin, triiodothyronine (T3) and thyroxine (T4) concentrations were determined. During weeks 2, 4 and 10 (and 14; genotype comparison only) of lactation blood samples were collection at 20 minute intervals for 8 hours and individually assayed for plasma insulin, GH, cortisol and prolactin concentrations. Ewes rearing twin lambs had higher milk yields than those rearing single lambs. This was associated with higher NEFA, 3-OHB, GH and cortisol concentrations and lower insulin concentrations in the plasma of twin-rearing ewes. There were no consistent differences in prolactin or thyroid hormone concentrations of the plasma of single and twin rearing ewes. The decline in milk production with advancing lactation was associated with an increase in the post prandial insulin:GH and insulintcortisol ratios and T4 levels and a decrease in prolactin levels. Feeding was followed by significantly higher insulin levels and slightly higher GH levels Ewes fed the high protein diet had higher milk yields and milk protein contents compared with ewes fed the low protein diet. This, however, was not apparently associated with a higher degree of adipose tissue mobilisation. There were no significant differences between the two protein treatments in any of the plasma hormones measured. Change in milk production with stage of lactation was associated with an increase in the insulin:GH and insulinrcortisol ratios and in circulating T4 levels, and a decrease in plasma prolactin levels. During early lactation, feeding was followed by a rise in insulin and GH levels but during late lactation only insulin levels increased. In contrast to previous observations there was no difference in milk yield or pattern of milk production between the ewes of the EF and SBF genotypes. SBF ewes produced milk of higher fat content compared with EF ewes. All ewes gained similar amounts of live weight throughout lactation. However, plasma albumin and protein levels were lower in EF compared with SBF ewes; plasma insulin, cortisol, prolactin and T3 levels were consistently lower in EF than in SBF ewes. The decline in milk production in late lactation was associated with an increase in the insulin:GH ratio and in T4 levels while prolactin levels decreased. Feeding was followed by increased insulin levels and cortisol levels (EF ewes only) and lower GH levels (during late lactation). The role of these hormones in the control of milk production is discussed and in particular the hormonal inter-relationships in relation to level and pattern of milk production and associated nutrient status throughout lactation.
APA, Harvard, Vancouver, ISO, and other styles
48

Rogers, Gabrielle Marie. "Tumor necrosis factor- alpha production induced by peptidoglycan-polysaccharide in early pregnant ewes." Morgantown, W. Va. : [West Virginia University Libraries], 2006. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=4712.

Full text
Abstract:
Thesis (M.S.)--West Virginia University, 2006.
Title from document title page. Document formatted into pages; contains vi, 45 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 40-45).
APA, Harvard, Vancouver, ISO, and other styles
49

Weerasinghe, W. M. P. B. "Effects of conjugated linoleic acid on the performance and metabolism of dairy ewes." Thesis, Harper Adams University College, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.492004.

Full text
Abstract:
Four experiments were conducted to investigate the effects of conjugated linoleic acid (CLA) on the performance and metabolism of dairy ewes. In experiment 1, the effects of oil source, feed and pH on biohydrogenation of C18:2n-6 and production of CLA was assessed invitro. Biohydrogenation of C18:2n-6 increased with increasing vessel pH whilst the formation of cis-9, tnms-ll CLA and tralls-lO, cis-12 CLA were related to the initial vessel content of C18:2ti-6. A combination of a high starch diet and low vessel pH resulted in the highest concentration of trans-lO, cis-12 CLA, whilst cis-9, trans-l1 CLA content was greater with a high forage diet and high vessel pH. In experiment 2, the effects of starch level and forage particle length on the performance and milk fat content of CLA in dairy ewes was examined. Feeding high starch diets to ewes increased DMI and reduced milk fat content by proportionately 0.08. Milk fat trans-lO, cis-12 CLA content was not affected by dietary treatment but cis-9, trans-II CLA increased in milk from ewes when fed the low starch diets. In experiment 3, the effects of a rumen protected source of tralls-l0, cis-12 CLA and cis-9, trans-l1 CLA on the performance of dairy ewes fed at a restricted energy intake and differing metabolizable protein (MP) content was assessed. Supplementation with CLA reduced milk fat content, fat yield and milk protein content by 0.33, 0.24 and 0.03 respectively but increased milk yield and yields of milk protein and lactose by 0.14, 0.12 and 0.15 respectively. Compared with low MP, high MP diets resulted in 0.15, 0.16 and 0.14 higher yields of milk, milk protein and lactose respectively. Milk fat content of tnms-lO, cis-12 CLA and cis9, t~alls-ll CLA were increased due to CLA supplementation. In experiment 4, the dose effect of CLA on performance, carcass characteristics and tissue fatty acid composition of dairy ewes was examined. Ewes fed high CLA (H-CLA) had 0.13 higher milk yield compared with those fed the control (C) or low CLA (L-CLA). Compared with the animals fed the control diets, milk fat content was reduced incrementally by 0.15 and 0.34 and fat yield reduced incrementally by 0.14 and 0.24 for L-CLA and H-CLA respectively. Inclusion of CLA increased tralls-lO, cis-12 CLA and cis-9, tralls-l1 CLA in milk fat, and mammary, liver, heart, muscle and perirenal fat, but tissue total fat content and tissue levels of Acetyl-eoA carboxylase and Stearoyl-CoA desaturase mRNA was not affected by dietary treatment.
APA, Harvard, Vancouver, ISO, and other styles
50

Henderson, Jennifer Jean. "The effects of antenatal glucocorticoid treatment on lactogenesis II in ewes and women." University of Western Australia. School of Women's and Infants' Health, 2007. http://theses.library.uwa.edu.au/adt-WU2007.0058.

Full text
Abstract:
[Truncated abstract] There is a large body of evidence describing the benefits and risks, to the human fetus, of antenatal glucocorticoid treatment, but no published research on the effects on lactation. The withdrawal of progesterone, in the presence of high levels of endogenous glucocorticoids and prolactin, triggers the onset of copious milk secretion (lactogenesis II) at the end of pregnancy. The alteration of lactogenesis II by exogenous glucocorticoids could potentially have adverse impacts on postnatal nutrition in both term and preterm infants. I aimed to determine the effects of maternal antenatal glucocorticoid treatment on lactogenesis II in both ewes and women. I found profound adverse effects on lactation in ewes, and similar but more subtle effects on lactation in women . . . This thesis represents the first investigation of the effects of antenatal glucocorticoid treatment on lactogenesis II in both ewes and women. I found that, in ewes, antenatal glucocorticoid treatment stimulated premature lactogenesis II, and this was caused by disruptions to hormonal regulation during pregnancy. This event was followed by profound delays in lactogenesis II after term parturition. More subtle effects in women suggest that antenatal glucocorticoid treatment did not have a major, prolonged impact on postnatal lactogenesis II. Very preterm gestational age strongly predicted delays in lactogenesis II stressing the importance of assistance for these mothers when they are establishing lactation.
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the bibliographies on the topic 'Ewes' for other source types:
Journal articles Books
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography