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Tesi sul tema "Sheep Feed utilization efficiency"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 31 gennaio 2023

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1

Sheridan, Rouxlene. "A comparative analysis of nutrient utilisation and meat quality parameters of boer goats and South African mutton merinos." Thesis, Stellenbosch : Stellenbosch University, 2001. http://hdl.handle.net/10019.1/52060.

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Thesis (MScAgric)--University of Stellenbosch, 2001.<br>ENGLISH ABSTRACT: One of the reasons why meat supply does not meet human demand is that man has concentrated on utilising relatively few animal species as a source of meat. Development of unconventional livestock, such as goats, is advocated as a means of increasing global meat production and consumption. Although South Africa possesses large numbers of domestic ruminants, meat consumption has been limited mainly to sheep and cattle. Goats are used to a lesser extent. This is partly attributed to a general belief that goat meat is i

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2

Hosking, Brenton John. "Evaluation of nutrient intake and digestion in grazing sheep receiving supplements : thesis submitted for the degree of Doctor of Philosophy." Title page, summary and contents only, 1987. http://web4.library.adelaide.edu.au/theses/09PH/09phh826.pdf.

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Includes bibliographical references (leaves 290-309) Investigates aspects of the intake and utilization of barley grain and grain legume supplements by sheep fed low quality pasture hay and when grazing mature summer pastures.

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3

DiRienzo, Douglas B. "Free and peptide amino acid fluxes across the mesenteric and non-mesenteric viscera of sheep and calves." Diss., Virginia Tech, 1992. http://hdl.handle.net/10919/39841.

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4

Matthews, James C. "Absorption of carnosine and methionylglycine by sheep ruminal and omasal epithelia." Thesis, Virginia Tech, 1991. http://hdl.handle.net/10919/41689.

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Carnosine and methionylglycine (using ³⁵S-methionylglycine as a representative marker) absorption and transfer across ruminal and omasal epithelia collected from four (carnosine) and seven (methionylglycine) sheep were studied using parabiotic chambers that were repeatedly sampled over a 240-min incubation. The quantity of dipeptide absorbed or transferred was linearly (P < .01) dependent on substrate concentration. Carnosine was transferred intact across both tissues. More carnosine was absorbed (P < .02) and transferred (P < .01) by the omasal epithelia. Methionylglycine was transferred inta

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5

Nolte, Joubert van Eeden. "An evaluation of degradable protein and nonprotein nitrogen on intake and digestion by Dohne merino sheep fed wheat straw." Thesis, Stellenbosch : Stellenbosch University, 2000. http://hdl.handle.net/10019.1/51597.

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Thesis (MSc)--Stellenbosch University, 2000.<br>ENGLISH ABSTRACT: South Africa, like many other developing countries throughout the world, has a rapidly growing human population, resulting in a consequent increased demand for food. Ironically, this increased food supply has to be produced on a smaller area of available agricultural land, which means that agricultural production processes have to become more efficient. Furthermore, the majority of the people in these countries are unschooled and poverty is a common phenomenon. Therefore, animal scientists are faced with the challenge and t

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6

Chadwick, Megan. "Fetal programming of sheep for production on saltbush." University of Western Australia. School of Animal Biology, 2009. http://theses.library.uwa.edu.au/adt-WU2010.0033.

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[Truncated abstract] Saltbush is one of the few types of forage that will grow on salt affected land but, sheep struggle to maintain weight when grazing saltbush mainly because of its high salt content. Therefore, a strategy to improve salt tolerance of sheep would be beneficial to the profitable use of revegetated saline land. This could be done by manipulating the dietary salt load of pregnant or lactating ewes which could 'program', or permanently alter the physiology of their offspring to allow them to cope better with a high-salt diet as adults. When rat dams consume a high amount of salt

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7

Wiryawan, I. Komang Gede. "Microbial control of lactic acidosis in grain-fed sheep." Title page, contents and summary only, 1994. http://web4.library.adelaide.edu.au/theses/09PH/09phw799.pdf.

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Bibliography: leaves 122-138. Investigates the use of microbial inoculants to prevent the onset of acidosis in acutely grain fed animals; and, the most effective combination of virginiamycin and lactic acid utilising bacteria (selenomonas ruminantium subsp. lactilytica and Megasphaera elsdenii) in controlling lactic acid accumulations in vitro.

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8

Torbatinejad, Nourmohammad. "Nutritional evaluation and utilisation of an aquatic plant, Posidonia australis (seagrass) in sheep." Title page, table of contents and abstract only, 1995. http://web4.library.adelaide.edu.au/theses/09PH/09pht676.pdf.

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Includes bibliographical references (leaves 290-333). Describes research into the nutritional value of aquatic plants as novel or non-conventional feedstuffs for ruminants in general and for sheep in particular, with especial reference to those which are available in high amount in southern Australia, such as the seagrass, Posidonia australis.

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9

Forster, Lance Allen. "Nutritional value of flat pea hay fed to sheep at different levels." Thesis, Virginia Tech, 1988. http://hdl.handle.net/10919/43855.

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<p>Two experiments were conducted with sheep to determine the nutritional value of 'Lathco' flatpea (Lathyrus sylvestris) hay. In experiment 1, a finishing trial was conducted with 50 group fed crossbred lambs (25 ewes and 25 wethers) fed diets consisting of 70% chopped forage and 30% ground corn grain for 70 d. Five pens of five wethers and five pens of five ewes were selffed diets in which the forage consisted of 100:0, 75:25, 50:50, 25:75, and 0:100 proportions of alfalfa (Medicago sativa L.) and flatpea hay. Feed efficiencies decreased linearly (P<.05) as flatpea increased in the diet. Lin

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10

Cooke, Judith A. "Utilization of phosphorus and other minerals from broiler litter and swine waste." Diss., Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/64667.

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Two metabolism trials were conducted with 15 wethers surgically equipped with duodenal and ileal cannulas to study the absorption of P and certain other minerals from swine waste and broiler litter. The effect of source and level of P on rumen cellulytic bacterial populations was also determined. Animals were fed a low P basal diet until serum inorganic P averaged 5.5 mg/dl, then randomly assigned to the following diets: low P basal alone, or supplemented with swine waste, broiler litter, dicalcium phosphate, or soybean meal. Trials consisted of a 7-d preliminary period, a 7-d collection of ur

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11

Mayberry, Dianne. "Getting into the guts of a salty problem : poor animal production from saltbush pastures is due to inefficient rumen fermentation." University of Western Australia. School of Animal Biology, 2009. http://theses.library.uwa.edu.au/adt-WU2009.0071.

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The main hypothesis tested in this thesis was that poor animal production from saltbush pastures is due to the negative effects of high sodium chloride (NaCl) and potassium chloride (KCl) on the ruminal environment, and subsequent effects on microbial populations and products of rumen fermentation. This main hypothesis was tested in two experiments. In the first experiment (Chapter Four) the effects of saltbush and a formulated high-salt diet on the ruminal environment and microbial populations were measured over 24-hours following feeding. Feeding both the saltbush and high-salt diet increase

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12

Alvarenga, Amanda Botelho. "Feed efficiency traits in Santa Inês sheep under genomic approaches." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/11/11139/tde-20032018-160145/.

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The selection on genetic values predicted from markers could substantially increase the rate of genetic gain in animals by increasing accuracy of prediction and reducing generation interval, especially for difficult to measure traits, such as feed efficiency. Feed efficiency is the most important trait in animal production due to its impacts on cost of production and environmental factors. Many metrics measure the feed efficiency, such as ratio of gain to feed (FER), the ratio of feed to gain (FCR) and residual feed intake (RFI). Nevertheless, in ovine, no study with the aim of understand the

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13

Aboud, Ali A. O. "Strategies for utilization of sorghum stover as feed for cattle, sheep and goats." Thesis, University of Reading, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.305093.

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14

Golden, Joseph W. "Determining variables linked to the phenotypic expression of fedd efficiency using residual feed intake as a measure of efficiency /." free to MU campus, to others for purchase, 2004. http://wwwlib.umi.com/cr/mo/fullcit?p1426062.

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15

Rising, Russell Marshall. "Indirect calorimetry evaluations of energy utilization by laying hens: Nutrient and temperature effects." Diss., The University of Arizona, 1988. http://hdl.handle.net/10150/184626.

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A four-chamber indirect calorimeter was constructed to evaluate energy utilization by laying hens as affected by dietary energy, protein and amino acid levels and by housing temperature. Heat production was measured by indirect calorimetry and metabolizable energy was determined for each diet. Net energetic efficiency was calculated as the slope of the regression of energy balance (metabolizable energy intake - heat production) on metabolizable energy intake. Hens fed diets formulated without protein specifications to provide amino acid levels equivalent to those provided by 14.5 or 16% protei

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16

Walsh, Mark Gordon. "Evaluation of dietary carbohydrate utilization by captive sablefish (Anoplopoma fimbria)." Thesis, University of British Columbia, 1991. http://hdl.handle.net/2429/30429.

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Carbohydrates have variable digestibilities and metabolizable energy values in carnivorous fish. Simple sugars are generally more digestible than complex polysaccharides, and low levels of dietary carbohydrate may contribute more metabolizable energy than high levels. Two experiments were conducted to study the effects of dietary level and processing treatment of wheat starch on the digestibility of diets fed to sablefish (Anoplopoma fimbria), in different regions of the digestive tract. Moreover, an experiment was undertaken to determine if the dietary concentration of an indigestible externa

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17

Khalaf, Sadi Shalan. "Utilization of wheat straw in rations for lactating dairy cows." Diss., The University of Arizona, 1987. http://hdl.handle.net/10150/184287.

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An experiment involving three feeding trials was conducted to study the effect of substituting chopped wheat straw for alfalfa in diets for lactating dairy cows. The results of these trials have shown that in complete mixed diets or diets containing long alfalfa hay, replacement of half of the alfalfa in rations containing 45% roughage for lactating dairy cows with chopped wheat straw does not adversely affect DM intake or milk yield and increase milk fat percentage. Replacing half of the long alfalfa with chopped alfalfa also apparently improved lactational performance although not as dramati

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18

Ageeb, Abdel Gadir Ahmed. "Genetic relationships among feed intake measures, feed conversion efficiency, and milk production traits in Holsteins using field recorded data." Thesis, McGill University, 1999. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=35555.

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A total of 114,351 Holstein first lactation records collected by the Quebec Dairy Herd Analysis Service (DHAS-PATLQ) between September, 1979 and January, 1994 were used to study the effects of adjusting records for linear and quadratic effects of 90- and 305-d feed intake measures (total energy, total protein and total dry matter) on estimation of heritabilities of and genetic correlations among yield and composition traits. Genetic parameters of feed intake measures, relationships between feed intake and age and weight at calving, and feed conversion efficiency traits were also examined in a

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19

Mukumbo, Felicitas Esnart. "Effect of dietary inclusion of Moringa oleifera Lam leaf meal on feed conversion efficiency, meat quality, fatty acid composition, shelf life and consumer health-related perceptions of pork." Thesis, University of Fort Hare, 2013. http://hdl.handle.net/10353/d1016071.

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The objective of the study was to determine the feed conversion efficiency (FCE), carcass characteristics, physico-chemical quality, fatty acid (FA) composition and shelf life of pork from pigs fed diets containing either 0% (T1), 2.5% (T2), 5% (T3) or 7.5% (T4) Moringa oleifera leaf meal (MOLM). Consumer health-related perceptions on pork and fatty acids were also investigated. Twenty four crossbred Large White x Landrace pigs of both sexes at 18 weeks of age and initially weighing 71.6 kg on average were housed individually and had ad libitum access to one of the four dietary treatments for

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20

St-Pierre, Normand Roger. "Minimum cost requirements from a response function and incorporation of uncertainty in composition of feeds into chance-constrained programming models of livestock rations /." The Ohio State University, 1985. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487260135354794.

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21

Du, Plessis J. J. P. (Johannes Jacobus Pieter). "The effect of different dietary levels of energy and protein on the production and body composition of broiler breeders." Thesis, Stellenbosch : Stellenbosch University, 2000. http://hdl.handle.net/10019.1/51966.

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Thesis (MScAgric)--University of Stellenbosch, 2000<br>ENGLISH ABSTRACT: A flock of 500 Hybro broiler breeders were employed to study the effect of different levels of protein and energy on production and body composition. The daily lysine intake of the birds were 900, 1050, 1200 and 1350 mg respectively, each fed in diets with a daily energy intake of 1800 and 2000 kJ ME to provide a 4 x 2 factorial design. Lysine was used as the reference amino acid in the experiment and all other amino acids were kept in a constant ratio in every experimental diet. The total production was divided int

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22

Morrow, Alan Thomas Samuel. "Studies on voluntary feed intake of growing pigs with reference to behaviour and efficiency of food utilization." Thesis, Queen's University Belfast, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.333822.

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23

Sebastian, Sylvester. "The effects of supplemental microbial phytase on nutrient utilization in broiler chickens /." Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=34448.

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The influence of microbial phytase on growth performance, availability of macro and trace minerals, apparent ileal digestibility (AID) and apparent "fecal" digestibility (AFD) of amino acids (AA) and CP were investigated. The optimum level of dietary Ca and P for the maximum efficacy of supplemental phytase in broiler chickens was also studied. Phytase supplementation (600 U/kg) to a low P diet increased $(P 0.05)$ on feed efficiency in broiler chickens at 21 d. The efficacy of phytase, particularly in stimulating growth, was higher in male than female chickens. The relative retention of Ca, P

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24

Janicki, Francis John. "Fiber and nitrogen fractions of forages and by-product feeds determined by in vitro and in situ procedures." Diss., Virginia Polytechnic Institute and State University, 1986. http://hdl.handle.net/10919/49798.

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25

BACO, ABDUL-AZIZ ISHAK. "TALLOW FOR LAYING HENS (POULTRY, FAT, PERFORMANCE, AMINO ACIDS)." Diss., The University of Arizona, 1985. http://hdl.handle.net/10150/188112.

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Effects of tallow supplementation on dietary nutrient and minimal amino acid utilization in the laying hen were studied in two experiments. In the first experiment diets contained six levels of animal tallow ranging from 0 to 10%. Percent egg production and egg mass were not significantly affected by tallow. Body weight was significantly increased by 2% tallow was maximum at 6%. Addition of up to 6% fat improved feed conversion without adversely affecting other production characteristics. Metabolizable energy (ME) intake increased from 305.1 to 322.4 kcal/hen/d over the range of 0 to 6% tallow

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26

Azevedo, Paula Alexandra Gil. "Effects of feeding level, water temperature and diet composition on growth and efficiency of feed utilization in two salmonids." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ33201.pdf.

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27

Wilson, Jonathan Wesley. "Preparation of brush border and basolateral membrane vesicles from bovine intestine for nutrient uptake studies." Thesis, Virginia Polytechnic Institute and State University, 1986. http://hdl.handle.net/10919/101336.

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Brush border and basolateral membrane vesicles were isolated by subjecting homogenized mucosal cells from bovine small intestine to a divalent cation aggregation followed by a series of differential and density gradient centrifugations. Membrane marker enzyme assays were used to monitor the effectiveness of the fractionation procedure. Enrichments were determined by comparing the enzyme specific activities of the membrane fractions to the homogenate. Sodium-potassium adenosine triphosphatase and alkaline phosphatase served as the enzyme markers for the basolateral and brush border membranes, r

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28

Pigurina, Guillermo. "Estimation of the proportions of grass and legume in extrusa of esophageallly-fistulated animals." Thesis, Virginia Polytechnic Institute and State University, 1986. http://hdl.handle.net/10919/101359.

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Three studies were conducted to evaluate a method for estimating grass and legume fractions in extrusa samples from esophageally-fistulated animals, based on different concentrations of neutral detergent fiber (NDF), Ca and lignin in grasses and legumes. In experiment 1, NDF, Ca and lignin concentrations were measured in mixtures of six combinations of red clover-orchardgrass and alfalfa-tall fescue (100:0; 80:20; 60:40; 40:60; 20:80; 0:100). The R² values were .90, .80 and .22 for Ca, NDF and lignin, respectively. In experiment 2, fresh tall fescue and red clover were collected during 8 d, mi

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29

Borucki, Castro Sylvia Irene. "The effect of treatment of soybean meal on the availability of amino acids and the efficiency of nitrogen usage for milk production in dairy cows /." Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=102961.

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In the first of three experiments, four Holstein multiparous dairy cows, equipped with ruminal and duodenal cannulas, were used to determine the impact of different methods of treating soybean meal (SBM) on ruminal degradability and intestinal digestibility of CP and amino acids (AA). Solvent extracted SBM (SE), expeller SBM (EP), lignosulfonate SBM (LS) and heat and soy hulls SBM (HS) were incubated in the rumen, in nylon bags, for various intervals up to 48h. Additional samples incubated for 16 h were pre-treated with pepsin HCI, and then used for determination of intestinal digestibility ei

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30

McDougall, N. Ruth. "The evaluation of raspberry pomace as a feedstuff for growing pigs." Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/29580.

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Raspberry pomace, consisting of seeds, pulp and added rice hulls, is the residue from the pressing of raspberries for juice and concentrate production. Through the determination of chemical composition by laboratory analyses and the measurement of feeding value in animal trials, the pomace was evaluated as a feedstuff for growing pigs. Pomace contains 11.1% crude fat, 10.0% crude protein, 59.5% total dietary fibre, 7.4% soluble carbohydrates, and a gross energy level of 5220 kcal*kg⁻¹. The acid detergent residue of the pomace contains 11.7% lignin, 6.0% cutin, 2.2% acid detergent ash and 26.0

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31

Thornton, John. "The effect of dietary protein degradability on the performance of Saanen dairy goats." Thesis, Stellenbosch : Stellenbosch University, 2001. http://hdl.handle.net/10019.1/52516.

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Thesis (MScAgric)--Stellenbosch University, 2001.<br>ENGLISH ABSTRACT: The goat is a significant domestic animal throughout the world today. With an estimated world goat population of 590 million goats in 1991 (FAO, 1991 as citied by Haenlein, 1996) it is impossible to consider the goat as insignificant. The need for milk, and it seems particularly goat’s milk, is obvious if one considers the increase in dairy goat populations over the past 20 years. Across the globe the dairy goat population has increased by 52% while in developing and developed countries, there has been an increase of

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32

Robey, Walter Wade. "Adipocyte hyperplasia and fat deposition in high-weight and low- weight chickens." Diss., Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/49880.

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Four experiments were conducted to compare adipocyte dynamics and body composition among adult chickens from lines differing in growth rate and feed consumption. In Experiment I, forced caloric overconsumption increased weight gain and fat deposition, with concomitant increases in the total adipocyte DNA content of the assayed fat depots. Injections of DNA-specific [methyl³H] thymidine resulted in higher radioactivity levels in the fat depots of forced versus ad libitum or restricted-fed birds. Evidently, stimulation of fat deposition in adult chickens can be associated with adipocyte hyperpla

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Blake, John Paul. "Methodology for evaluating the digestibility and metabolizable energy of poultry feedstuffs." Diss., Virginia Polytechnic Institute and State University, 1986. http://hdl.handle.net/10919/49987.

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Determining the energy values of feed ingredients for poultry is of great concern, especially since production efficiency is associated with profit margins. Therefore, accurate, precise, and reproducible energy values for feed ingredients are of the utmost importance in formulating an economical diet. An important aspect in determining the apparent metabolizable energy (AME) of a feed ingredient is the procedure employed in the drying of excreta samples. During sample preparation, substantial grinding losses were incurred amounting to 3.5 to 5.2% of the dried sample weight. Also moisture upta

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Van, der Baan Annelize. "The determination of digestibility of Atriplex nummularia cv. De Kock with different techniques." Diss., Pretoria : [s.n.], 2008. http://hdl.handle.net/2263/25996.

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The aim of the study was to determine the digestibility of Atriplex nummularia cv. De Kock, supplemented with three levels (15%, 30%, and 45%) of either maize or barley, using different in vitro techniques. An in vivo digestibility trial was conducted, together with a number of in vitro trials. An important development has been the introduction of biological methods (Jones&Theodorou, 2000). Three digestion techniques that simulate the digestion process are currently available to determine the nutritive value of ruminant feeds: <ol> <li>Digestion with rumen micro-organisms as in the work of Til

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Sarout, Bruna Nunes Marsiglio. "Behavioural circadian rhythms : a novel approach to monitor sheep in extensive systems and study the differences between beef steers for methane emission, feed efficiency and growth." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2017. http://hdl.handle.net/10183/164375.

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As tecnologias baseadas em sensores estão cada vez mais disponíveis e podem ser usadas para coletar informações detalhadas sobre o comportamento animal. Com esta informação é possível avaliar o ritmo circadiano de variáveis comportamentais e monitorar sua resposta. A identificação de variações na resposta deste ritmo tem o potencial de detectar problemas de saúde e questões de bem-estar animal. O objetivo deste trabalho foi estudar os ritmos circadianos comportamentais como uma nova abordagem para monitorar ovelhas em sistemas extensivos e estudar a emissão de metano, eficiência alimentar e cr

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Moore, Robert J. "The effect of high-fiber diets on nutrient utilization and intestinal morphology of growing pigs." Diss., Virginia Polytechnic Institute and State University, 1986. http://hdl.handle.net/10919/71156.

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Three balance experiments were conducted to determine the effects of dietary fiber on mineral balance and intestinal.morphology of growing pigs. Fiber sources were added to corn-soybean meal diets at levels which increased neutral-detergent fiber levels by 6 to 8%. In experiment 1, 10% oat hulls (OH) decreased Ca (P<.06) and Zn (P<.01) balances of pigs after a 7 d feeding period. Wheat bran (20%) increased Mg intake and balance (P<.02), but did not affect Ca and Zn balances. In experiment 2, pigs were fed diets (with or without supplements of Zn, Fe and Mg) containing 15% OH or soybean hulls (

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37

Normand, Luc. "Recycling of agro-industrial food wastes into feed for Pekin duck meat production towards a sustainable agriculture in the Province of Quebec." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape16/PQDD_0004/MQ29759.pdf.

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Smith, Jonathan David. "Exploring the use of technical indicators as pricing guides in feeder cattle production criteria." Thesis, Virginia Polytechnic Institute and State University, 1989. http://hdl.handle.net/10919/74540.

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The objective of this study was to examine the use of technical indicators, in an econometric context, as guides in making pricing decisions relative to feeder cattle production. Technical indicators were developed for both the short and long term. Short term indicators were designed to capture divergence/convergence between the Relative Strength Index and the futures price stream to form the Price Linked to Divergence index. A long term indicator using an average difference in price over a longer period was developed to form the Price Linked to Trend index. These indicators were used in the e

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Herrera, y. Saldana Rolando Ernesto. "The effect of synchronization of protein and starch degradation in the rumen on nutrient utilization and milk production in dairy cows." Diss., The University of Arizona, 1988. http://hdl.handle.net/10150/184373.

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Four studies were conducted to determine the effect of synchronization of protein and starch degradation on nutrient utilization, microbial protein synthesis and milk production in dairy cows. In Experiment 1, five cereal grains and five protein supplements were compared for extent of solubility and degradability of their starch and nitrogen fractions. Results indicated large differences which permitted their ranking from high to low degradability as follows: grains, oats > wheat > barley > corn > milo protein supplements, soybean meal > cottonseed meal, (CSM) > corn gluten meal > brewers drie

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Mohamed, Neijat. "Assessing the feeding value of pea straw and evaluating biological methods to improve its utilisation by ruminants." Title page, contents and abstract only, 1995. http://web4.library.adelaide.edu.au/theses/09AS/09asm697.pdf.

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Copies of the author's previously published articles inserted. Bibliography: leaves 142-159. Provides information on the significance of pea straw as a ruminant feed and the potential of two biological techniques for improving its feeding value.

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Van, der Westhuizen Robert Rolfe. "A genetic analysis of biological and economic efficiency of post-weaning feedlot performance in beef cattle." Thesis, Stellenbosch : Stellenbosch University, 2005. http://hdl.handle.net/10019.1/50249.

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Thesis (PhD (Agric))--University of Stellenbosch, 2005.<br>ENGLISH ABSTRACT: It is generally accepted that feed intake and growth (gain) are the most important economic components when calculating profitability in a growth test or feedlot. Feeding cost of animals is a major determinant of profitability in livestock production enterprises. Genetic selection to improve feed efficiency aims to reduce the cost of feeding in beef cattle production and thereby improve profitability. The objective of this study was to define a clear selection objective to enable South African beef breeders and

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Dodzi, Madodana Sunson. "Time budgets, avoidance distance scores-related behaviour and milk yield of pasture-based Jersey, Friesland and cross bred cows." Thesis, University of Fort Hare, 2010. http://hdl.handle.net/10353/474.

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Time budgets, avoidance distance scores-related behaviour and milk yield of pasture-based Jersey, Friesland and crossbred cows. by Madodana Sunson Dodzi The study was conducted at the University of Fort Hare farm to determine the time budgets, the avoidance-related behaviour variables and their relationship with milk yield in three pasturebased dairy genotypes: Jersey, Friesland and crossbreed. Twenty one clinically health dairy cows aged between 52 and 55 months, in mid lactation and comprising of seven cows from each genotype were used in the study. The time spent on different activities (gr

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Budu, Ben Asare. "Economic feasibility of processing food waste and incorporating processed food waste products in least cost duck feeds." Thesis, McGill University, 2001. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=33067.

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The focus of this thesis was to analyze the least cost of producing rations for ducks in three age categories from a mixture of conventional feed ingredients and three different processed food waste products and to examine the financial and economic feasibility of establishing an industrial plant to produce these food waste products in the Montreal region. The first part of the thesis was investigated through the use of a linear programming model. The effect of recognizing the variability of protein levels in the various feed ingredients was examined through the use of chance-constrained progr

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Clark, Gabriel Willis. "An Economic Evaluation of Winter-feeding Strategies for Lactating Organic Dairy Cows Utilizing Different Forage and Concentrate Feeding Systems in Maine." Fogler Library, University of Maine, 2009. http://www.library.umaine.edu/theses/pdf/ClarkGW2009.pdf.

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Teuchert, Nicole. "Comparison of production parameters, gut histology, organ weights, and portion yields of broilers supplemented with Ateli plus." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/86448.

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Thesis (MScAgric)--Stellenbosch University, 2014.<br>ENGLISH ABSTRACT: Antibiotic growth promoters (AGP’s) have been used in feed of production animals to improve their growth performance and disease resistance. However, there has been an increase in the presence of antibiotic residue in animal products, as well as an increase in untreatable illnesses due to antibiotic resistant bacteria. This led to the European Union banning the use of antibiotic growth promoters, in production animals, in 2006. An alternative to AGP’s is therefore needed in animal feed in order to maintain performance.

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Goosen, Liezel. "The effect of an exogenous fibrolytic enzyme on forage digestibility parameters." Thesis, Stellenbosch : Stellenbosch University, 2004. http://hdl.handle.net/10019.1/50141.

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Abstract (sommario):

Thesis (MScAgric) -- Stellenbosch University, 2004.<br>ENGLISH ABSTRACT: The ruminant has the ability to utilize forages more efficiently than any other production animal. The utilization of forage fibre is an important aspect of ruminant production systems, as this is the main source of energy available to the animal. The availability of high-fibre forage nutrients is, however, restricted by cell wall degradability, and since low quality forages contribute a great deal to ruminant production systems worldwide, the improvement of this degradation process is of major economic importance.

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Mogotlane, Pontsho Minah. "Effect of supplementing diets with antimicrobials and effective microorganisms on productivity and meat quality of Ross 308 Broiler Chickens." Thesis, University of Limpopo, 2016. http://hdl.handle.net/10386/1716.

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Thesis (MSc. (Animal Production)) -- University of Limpopo, 2016<br>This study was conducted to determine the effect of supplementing diets with antimicrobials and effective microorganisms on productivity and carcass characteristics of Ross 308 broiler chickens. The study consisted of two parts. The first part determined the effect of antimicrobial and effective microorganism (EM) supplementations on growth performance of unsexed Ross 308 broiler chickens aged one to 21 days. A complete randomized design was used and 150 unsexed day-old chicks with an initial weight of 42 ± 2g were randomly as

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Quigley, J. D. "Development of equations to predict dry matter intake of dairy heifers." Diss., Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/76478.

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Abstract (sommario):

Equations to predict daily dry matter intake (DMI) of individual animals were developed with 118 Holstein heifers fed totally mixed rations (TMR). Animals grouped according to body weight (136, 227, 317 kg) were fed TMR (corn silage, ground hay, high moisture corn, soybean meal) once daily for 28 days. Rations were balanced to mean body weight according to National Research Council (NRC) recommendations for protein, vitamins and minerals, and to 85, 95, 105, and 115% of recommendation for energy. Independent variables were body weight (BWT, kg/day) daily body weight gain (GAIN, kg), environmen

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Sitorski, Leonardo Gomes. "The Effects of Metabolizable Protein Intake and Post-Ruminal Flow of Amino Acids on Growth Performance and Pancreatic Digestive Enzymes in Steers." Thesis, North Dakota State University, 2018. https://hdl.handle.net/10365/29229.

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Abstract (sommario):

Excessive dietary protein may affect MP use because of energetic costs of excreting excess N. Amino acids also may influence post-ruminal digestion. Therefore, two experiments were designed to evaluate the effects of MP intake and post-ruminal flow of AA on growth performance and pancreatic digestive enzymes. In experiment 1, treatments supplied different amounts of MP intake to cattle and the effects on growth performance and feeding behavior were evaluated. In experiment 2, duodenal infusion of glutamate or casein was examined and the effects on pancreatic enzymes were measured. Experiment 1

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Mapfumo, Lizwell. "Time budgets, blood urea content, total protein and body condition scores as adaptive responses to seasonal dynamics by breeding Nguni cows and heifers reared on a sweetveld." Thesis, University of Fort Hare, 2013. http://hdl.handle.net/10353/d1015738.

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Abstract (sommario):

The objective of this study was to determine time budgets, blood urea content, total protein and body condition score as adaptive responses to seasonal dynamics by breeding Nguni cows and heifers reared on a sweetveld. Twenty four clinically healthy Nguni cows and heifers were selected for the study. The animals were grouped according to their parities namely: Parity 1 (n=5), Parity 2 (n=5), Parity 3-6 (old cows) (n=9) and in-calf heifers (n=5). Two separate experiments were conducted and running concurrently. In the first experiment time budgets (time spent walking, grazing, lying down, drink

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