Academic literature on the topic 'Sows Reproduction; Swine Pregnancy'
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Journal articles on the topic "Sows Reproduction; Swine Pregnancy"
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Kirkwood, R. N., A. J. Peacock, and P. A. Thacker. "The influence of growth hormone injections either pre- or post-breeding on the reproductive performance of sows and gilts." Canadian Journal of Animal Science 73, no. 2 (June 1, 1993): 259–65. http://dx.doi.org/10.4141/cjas93-028.
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Two experiments were conducted to examine the effect of porcine growth hormone (pGH) injections on reproductive performance of swine. In exp. 1, 62 mixed-parity Yorkshire × Land-race sows received 6 mg of pGH either daily (n = 20) or on alternate days (n = 20) from 2 d preweaning until 4 d postweaning, with remaining sows (n = 22) serving as controls. A single blood sample was obtained from each sow prior to the first injection, at weaning and at 4 d postweaning and samples were assayed for insulin, IGF-I and triiodothyronine (T3). Serum insulin tended (P = 0.1) to be higher at 4 d postweaning in sows injected daily but was unaffected by injections on alternate days. However, T3 and IGF-I were higher (P < 0.05 and P < 0.01, respectively) in both pGH groups compared with controls. No significant effects of either pGH treatment were apparent for the mean remating interval or subsequent litter size but the rebreeding interval was less variable (P < 0.01) for sows injected on alternate days. In experiment two, 40 Yorkshire × Landrace gilts received either 6 mg of pGH or vehicle on alternate days from days 5 to 21 of pregnancy. Single blood samples were obtained on days 5, 10, 15 and 20 of pregnancy and were assayed for insulin, IGF-I, T3 and progesterone. The injection of pGH had no effect on serum insulin or progesterone, caused a mild increase (P = 0.15) in serum T3 and increased (P < 0.01) serum IGF-I. There was no effect of treatment on pregnancy rate, ovulation rate, number of embryos or on embryo weight or crown-rump length. From the data of both experiments, we conclude that the injection of pGH either pre- or post-breeding will not improve the reproductive performance of swine. Key words: Growth hormone, IGF-I, reproduction, swine
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Muro, B., R. Carnevale, M. Mendonça, D. Leal, M. Torres, D. Nakasone, G. Ravagnani, et al. "54 Altrenogest supplementation during early pregnancy improves swine embryonic development." Reproduction, Fertility and Development 31, no. 1 (2019): 152. http://dx.doi.org/10.1071/rdv31n1ab54.
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Progesterone (P4) is of paramount importance in the establishment and maintenance of pregnancy for mammals. Progesterone stimulates the endometrial secretion of several molecules involved in conceptus growth and development during the peri-implantation period. Indeed, several studies involving ruminants have reported that exogenous P4 supplementation is related to increased early embryo development, higher levels of interferon tau, and improved pregnancy rate. However, there is a lack of information about P4 supplementation during early pregnancy regarding swine embryonic development. Additionally, some of the few studies involving pigs have shown an impaired pregnancy rate when supplementation was performed before Day 6 of pregnancy. Thus, the objective of this study was to evaluate the effects of progesterone/progestin supplementation from Day 6 of pregnancy on total number of embryos (TE), pregnancy rate (PR), embryo development, and maternal serum 17β-oestradiol concentration (17β-E). A total of 31 crossbred, 2 to 6 parity sows were used. All sows were inseminated every 24h through the first oestrus following a 21-day lactation, and ovulation was detected by transrectal real-time ultrasound to determine Day 0 of pregnancy. On Day 6 of pregnancy, animals were randomly allocated to one of the following groups: CON (n=11), non-supplemented sows; RU (n=11), sows supplemented daily with 20mg of Altrenogest-Regumate® from Day 6 to 12 of pregnancy; and PG (n=9), sows supplemented with 2.15 mg/kg of long-acting P4 IM on Day 6 of pregnancy. Sows were treated with altrenogest p.o. as a top dressing over a small portion of feed. Blood samples were collected from 12 sows (4 per group) on Day 12 of pregnancy to measure the level of plasma 17β-E by radioimmunoassay. Sows were slaughtered on Day 28 of pregnancy. The uterus from each sow was collected and embryos were counted to determine TE. Embryos were individually separated from their placentas, weighed, and crown-to-rump length was determined. Data were analysed by the SAS program. All variables were analysed by PROC-MIXED t-test. Statistical difference was considered when P<0.05. The PR did not differ among groups (91, 90, and 88%, for CON, RU, and PG, respectively; P>0.05). No difference was observed among groups for TE and 17β-E level (P>0.05). However, embryonic weight and crown-to-rump length differed among the 3 groups (P<0.001). The RU-treated sows had heavier and bigger embryos when compared with the other groups. In contrast, PG-treated sows had the lowest averages for the same variables (weight: 1.39±0.01, 1.46±0.02, and 1.22±0.01; crown-to-rump: 21.07±0.08, 21.61±0.11, and 20.66±0.11; for CON, RU, and PG, respectively). In conclusion, altrenogest supplementation from Day 6 to 12 of pregnancy increases size and weight of porcine embryos, whereas 2.15mg kg−1 of long-acting P4 on Day 6 of pregnancy decreased these variables when compared with non-supplemented sows. Research was supported by FAPESP Grant 2017/00290-0.
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FILATOV, A. V., V. S. LOBANOV, and V. P. KHLOPITSKY. "PROGESTAMAG® – AN EFFECTIVE REMEDY FOR INCREASE OF REPRODUCTIVE INDICATORS IN SWINE-BREEDING." PIG-BREEDING, no. 2 (2021): 43–45. http://dx.doi.org/10.37925/0039-713x-2021-2-43-45.
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The optimal frequency of administration and terms use of preparation Progestamag® for increased level of reproduction in sows are defined. The efficiency this hormonal progesterone-containing preparation in the critical period pregnancy of animals is revealed. Experimental studies have shown that injection of exogenous progesterone during early gestation contributes increase level of fertilization and multiple fetation of breeding stock pigs.
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Kirkwood, R. N., and P. A. Thacker. "The influence of adding estradiol to semen on reproductive performance of sows." Canadian Journal of Animal Science 71, no. 2 (June 1, 1991): 589–91. http://dx.doi.org/10.4141/cjas91-071.
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One hundred gilts and one hundred mixed-parity sows of Yorkshire and Landrace breeding were inseminated with semen with or without an additional 10 μg estradiol-17β. Pregnancy rates of gilts receiving estradiol-supplemented and control semen were 90 and 79%, respectively (P < 0.09). The estradiol supplementation of semen did not improve the pregnancy rates or litter size in sows. Key words: Swine, artificial insemination, estradiol
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Parraguez, Víctor H., Francisco Sales, Oscar A. Peralta, Mónica De los Reyes, Alfonso Campos, Javier González, Wolfgang Peralta, Camila Cabezón, and Antonio González-Bulnes. "Maternal Supplementation with Herbal Antioxidants during Pregnancy in Swine." Antioxidants 10, no. 5 (April 23, 2021): 658. http://dx.doi.org/10.3390/antiox10050658.
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The effects of a combined supplementation with herbal antioxidants during pregnancy on reproductive traits and piglet performance (number of live, dead, and mummified newborns and litter weight at birth and individual body weight at both birth and weaning) were assessed in a total of 1027 sows (504 treated and 523 control females) kept under commercial breeding conditions. The supplementation increased the number of live-born piglets (13.64 ± 0.11 vs. 12.96 ± 0.13 in the controls; p = 0.001) and the total litter weight, decreasing the incidence of low-weight piglets without affecting the number of stillbirths and mummified newborns. Such an effect was modulated by the number of parity and the supplementation, with supplementation increasing significantly the number of living newborns in the first, second, sixth, and seventh parities (0.87, 1.10, 1.49, and 2.51 additional piglets, respectively; p < 0.05). The evaluation of plasma vitamin concentration and biomarkers of oxidative stress (total antioxidant capacity, TAC, and malondialdehyde concentration, MDA) performed in a subset of farrowing sows and their lighter and heavier piglets showed that plasma levels of both vitamins were significantly higher in the piglets than in their mothers (p < 0.05 for vitamin C and p < 0.005 for vitamin E), with antioxidant supplementation increasing significantly such concentrations. Concomitantly, there were no differences in maternal TAC but significantly higher values in piglets from supplemented sows (p < 0.05). On the other hand, supplementation decreased plasma MDA levels both in the sows and their piglets (p < 0.05). Finally, the piglets from supplemented mothers showed a trend for a higher weaning weight (p = 0.066) and, specifically, piglets with birth weights above 1 kg showed a 7.4% higher weaning weight (p = 0.024). Hence, the results of the present study, with high robustness and translational value by offering data from more than 1000 pregnancies under standard breeding conditions, supports that maternal supplementation with herbal antioxidants during pregnancy significantly improves reproductive efficiency, litter traits, and piglet performance.
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Kousenidis, Konstantinos, Ioannis A. Giantsis, Efstathia Karageorgiou, and Melpomeni Avdi. "Swine Ultrasonography Numerical Modeling for Pregnancy Diagnosis and Prediction of Litter Size." International Journal of Biology and Biomedical Engineering 15 (February 10, 2021): 29–35. http://dx.doi.org/10.46300/91011.2021.15.5.
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Early and reliable diagnosis of pregnancy in sows is considered one of the most crucial parameters for the proper management in pig farming. Reproductive activity of the sows is directly correlated with the overall productivity of the enterprise. The best and most precise methodology to diagnose pregnancy in farm animals, including pigs, is ultrasonography. For getting optimal outputs of real-time ultrasonography application in pigs, both gestation status and litter size of sows is of high importance. Hence, a detailed evaluation and careful reading of the retrieved ultrasonic image could serve to the prediction of the sow’s litter size, providing valuable information to the producer. In the present article we studied the ultrasonic typification of sows in an effort to develop a methodology for the precise pregnancy diagnosis and the prediction of the litter size. To achieve this goal, 1214 matings and 1010 pregnancies were recorded and evaluated over a period of 20 months, in a pig unit in Northern Greece. Two thorough scans were performed on each sow, classifying the ultrasonic image in a scale of 0 to 10, 0 being ‘non pregnant’ and 10 given to the most reassuring image of pregnancy. Evaluations took place in a wide range of time since mating, hence between days 16 (the earliest first scan) and 68 (the latest that a second scan was performed) and the mean values obtained were 8,36 and 8,83 for the first and second scan respectively. Furthermore, the litter size of each subsequent parturition was recorded (mean: 12.22) and correlated to the score of each of the two scans performed during pregnancy. The results showed that more reassuring images and higher scores for both examinations of pregnancy were achieved with increasing time interval from mating (P<0.05). It is therefore suggested that a detailed real-time ultrasonic scanning, can provide a very useful tool, not only for pregnancy diagnosis, but also for the prediction of litter size and eventually the precise management of pregnant sows.
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BOGDAN, Liviu, Ioan GROZA, Mihai CENARIU, Simona CIUPE, Emoke PALL, Anamaria PETREAN, Sorana MATEI, and Sidonia BOGDAN. "RESEARCHES REGARDING ESTRUS INDUCTION AND SYNCHRONIZATION IN SOWS AFTER WEANING." Cluj Veterinary Journal 15, no. 1 (March 16, 2009): 25–29. http://dx.doi.org/10.52331/cvj.v15i1.5.
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The purpose of this paper was to improve the reproductive performances of sows after weaning in a private swine farm. The main objective was to implement modern reproductive biotechnologies (estrus synchronization, artificial insemination and early pregnancy diagnosis) in order to increase the economic efficiency of the reproductive sector of this farm. The biologic material used for the research was represented by 300 sows whose estrus was synchronized using three hormonal procedures (Regu-Mate administered collectively, Regu-Mate administered individually and PG600) as well as naturally, using stimulating boars. The results showed that the best methods of estrus induction and synchronization in sows use either Regu-Mate administered individually in fodder or PG600.
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Park, Y. S., S. H. Yang, S. M. Park, S. J. Kim, and J. B. Kim. "118 DEVELOPMENT AND EVALUATION OF A TIME-RESOLVED FLUORESCENCE IMMUNOASSAY FOR ESTRONE-1-SULFATE IN URINE AS A TOOL FOR DIAGNOSIS OF EARLY PREGNANCY IN SWINE." Reproduction, Fertility and Development 20, no. 1 (2008): 139. http://dx.doi.org/10.1071/rdv20n1ab118.
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Early identification of pregnancy or non-pregnancy in sows is considered very important, as the management of sows during the post service period is crucial if the breeding efficiency of a herd is to be maximized. Studies of steroid hormones in pregnant sows showed that there was a significant increase in plasma estrone-1-sulfate concentration by the 16th day of gestation, which reaches peak values between Days 23 and 30 of gestation. Since plasma estrone-1-sulfate concentrations are high between Days 23 and 30 of pregnancy, its determination has been used as a means for early pregnancy diagnosis and monitoring fertility in sows. However, the application of the method in pig farms on a routine basis remains restricted because blood sampling is difficult and disturbs the animals. The present study describes the development of a simple and reliable time-resolved fluorescence immunoassay (TR-FIA) method for the estimation of estrone-1-sulfate in swine urine, which was assessed as a means for early diagnosis of pregnancy and monitoring fertility in sows. We demonstrated cross activity between Anti-estrone-1-glucuronide antibody (Clone 155) and estrone-1-sulfate. The method is based on a direct competitive heterogeneous immunoassay by the typical procedure of competitive immunocomplex formation. For detection of estrone-1-sulfate, anti-estrone-1-glucuronide antibody (Clone 155) was first coated on polystyrene microplates, and estrone-1-sulfate was captured by the primary antibody with estrone-1-glucuronide labeled with europium. The immunocomplex was subsequently dissociated by the enhancement solution containing Triton X-100, acetic acid, and chelators. The free europium was detection by DELFIA 1420 detector (Perkin-Elmer Life Sciences, Waltham, MA, USA). The fluorescence intensity of free europium at 613 nm was proportional to the logarithm of the concentration of estron-1-sulfate in a dynamic range of 0.078~10 ng mL–1. Intra-assay variation for estrone-1-sulfate was 4%. The limit of quantification was 100 pg mL–1. The mean estrone-1-sulfate concentration was significantly higher in pregnant sows (15.6 � 5.3 ng mL–1) than in non-pregnant sows and in sows in estrus (0.74 � 0.44 ng mL–1). Taking the concentration of 20 pg mL–1 as a cut-off, all cases of non-pregnant sows and sows in estrus were negative. Urine estrone-1-sulfate concentrations in pregnant sows at 23-day intervals post-service were 14~16 ng mL–1. According to the results of our field trial, urine estrone-1-sulfate concentrations are very low during estrus and remain low in non-pregnant sows at different stages of the estrous cycle, whereas the concentration increases significantly during specific stages of pregnancy at 23-day intervals. It is concluded that the satisfactory sensitivity of the present assay in combination with the good correlation for pregnancy from the present field trial makes this method a very useful technique for early pregnancy diagnosis in swine; the simplicity of urine sampling makes also it suitable for practical use.
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Gotardo, André T., Isis M. Hueza, Helena Manzano, Viviane M. Maruo, Paulo C. Maiorka, and Silvana L. Górniak. "Intoxication by Cyanide in Pregnant Sows: Prenatal and Postnatal Evaluation." Journal of Toxicology 2015 (2015): 1–9. http://dx.doi.org/10.1155/2015/407654.
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Cyanide is a ubiquitous chemical in the environment and has been associated with many intoxication episodes; however, little is known about its potentially toxic effects on development. The aim of this study was to evaluate the effects of maternal exposure to potassium cyanide (KCN) during pregnancy on both sows and their offspring. Twenty-four pregnant sows were allocated into four groups that orally received different doses of KCN (0.0, 2.0, 4.0, and 6.0 mg/kg of body weight) from day 21 of pregnancy to term. The KCN-treated sows showed histological lesions in the CNS, thyroid follicle enlargement, thyroid epithelial thickening, colloid reabsorption changes, and vacuolar degeneration of the renal tubular epithelium. Sows treated with 4.0 mg/kg KCN showed an increase in the number of dead piglets at birth. Weaned piglets from all KCN-treated groups showed histological lesions in the thyroid glands with features similar to those found in their mothers. The exposure of pregnant sows to cyanide thus caused toxic effects in both mothers and piglets. We suggest that swine can serve as a useful animal model to assess the neurological, goitrogenic, and reproductive effects of cyanide toxicosis.
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Lord, Etienne, Bruce D. Murphy, Joëlle A. Desmarais, Sandra Ledoux, Danièle Beaudry, and Marie-France Palin. "Modulation of peroxisome proliferator-activated receptor δ and γ transcripts in swine endometrial tissue during early gestation." Reproduction 131, no. 5 (May 2006): 929–42. http://dx.doi.org/10.1530/rep.1.00657.
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Recent evidence points to a role for peroxisome proliferator-activated receptors (PPARs) δ and γ in embryo implantation and survival. In this study, we report the porcine PPARδ complete coding sequence and mRNA abundance of PPARδ, PPARγ1 and γ2, angiopoietin-like protein 4 (ANGPTL4) and adipocyte determination and differentiation-dependent factor 1 (ADD1) genes in the pregnant sow endometrium. Real-time PCR analysis was used to study the effect of parity (Yorkshire-Landrace multiparous (YL) and nulliparous (YLn)), site of endometrial tissue sampling (between and at embryo attachment sites) in crossbred Duroc×Yorkshire-Landrace (DYL) sows and stages of pregnancy (non-pregnant, day 15 and day 25 after mating) in Meishan-Landrace (ML) on mRNA levels. Parity effects were observed for PPARδ, ANGPTL4, and ADD1, with higher mRNA levels in YL than YLn sows. In DYL sows, lower mRNA levels were present at attachment sites compared to between attachment sites for PPARδ, PPARγ1, and ANGPTL4. Finally, day 15 pregnant ML sows had lower PPARδ mRNA levels compared to day 15 cycling ML sows. A significant increase of PPARγ1 mRNA levels was found on day 25 pregnant ML and DYL sows relative to day 15 ML or DYL pregnant sows. PPARδ and γ immunostaining was detected in endometrial tissue of day 15 cycling sows, day 15 and 25 pregnant sows and epithelial cells of day 25 embryos. Collectively, our results suggest a role for PPARδ, PPARγ1, and ANGPTL4, but not PPARγ2, during the peri-implantation period in pregnant sows.
Dissertations / Theses on the topic "Sows Reproduction; Swine Pregnancy"
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Stone, B. A. "Biochemical aspects of early pregnancy in the sow /." Title page, table of contents and abstract only, 1985. http://web4.library.adelaide.edu.au/theses/09PH/09phs8771.pdf.
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Thesis (Ph. D.)--University of Adelaide, Dept. of Obstetrics and Gynaecology,1985.Typescript (photocopy). Thesis submitted under title: Biochemical aspects of early pregnancy in the pig; but doctorate conferred to title: Biochemical aspects of early pregnancy in the sow. Includes bibliographical references (leaves 178-205) and list of personal publications related to pig physiology (leaves vi-vii).
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Hansen, Christiane. "The presence of follicular fluid in the porcine oviduct and its contribution to the acrosome reaction /." Thesis, McGill University, 1989. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=61855.
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McNamara, Louise B. "Feeding and managing of the high performing sow in pregnancy and lactation, and growth and development of progeny." Thesis, Royal Veterinary College (University of London), 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.558977.
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Hoyle, Ashley Sabine. "The Role of Supplemental Beef vs. Sugar during Pregnancy on Fetal and Offspring Developmental Programming in Swine." Thesis, North Dakota State University, 2019. https://hdl.handle.net/10365/29794.
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Sugar intake is linked to developmental programming of obesity and diabetes. We hypothesized that supplementing ground beef in place of sugar during pregnancy would reduce fetal and offspring developmental programming. Gestating sows were fed 1 of 4 isocaloric supplements: control, ground beef, granulated sugar, or beef plus sugar. In the fetal study supplements were fed from d 40 to 110 of gestation and in the offspring study from d 40 until weaning. Gene expression differences in fetal liver and muscle were observed for IGF2 (P = 0.04), FBPase (P = 0.03), and IGF2R (P = 0.02). Differences were also seen in offspring back fat (sex by day interaction, P = 0.01), longissimus dorsi muscle area (treatment by sex, P = 0.001), body weight (sex, P = 0.0006; sex by day interaction, P < 0.0001), and plasma insulin concentrations (treatment by sex, P = 0.0002).North Dakota Beef Commission
Topigs Norsvin
North Dakota. State Board of Agricultural Research and Education
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Harper, Allen F. "An assessment of the effects of dietary folic acid supplementation on serum folates status, conceptus development and reproductive performance in gilts and sows." Diss., Virginia Tech, 1992. http://hdl.handle.net/10919/39434.
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The effects of dietary folic acid supplementation on serum folate status, conceptus development and reproductive performance in gilts and sows was investigated in a series of experiments. The specific objectives of the study were to: 1) to study the serum folates profile following rapid consumption of a single meal containing different levels of supplemental folic acid; 2) to study the effects of maternal folic acid supplementation on conceptus survival, growth and development prior to mid-gestation in gilts and sows; and 3) to study the effects of multiple levels of dietary folic acid supplementation on sow reproductive performance over four successive parities.
In the first experiment (Chapter III), gilts fed a single, rapidly consumed meal, had a rapid increase in serum folates concentration during the first hour postprandial. Within eight hours after feeding, serum folates in the gilts had returned to near prefeeding levels. The results also suggest that supplementing the diet with increasing levels of folic acid over a range of 0 to 4 ppm results in more rapid postprandial uptake and elimination of folic acid from general circulation.
In the second experiment (Chapter IV), supplementing the diet of first parity and third parity breeding sows with 2 ppm folic acid had no effect on litter size at day 45 of gestation. However, several measurements associated with placental and fetal growth were increased with folic acid supplementation. Results of a fifth parity trial with four levels of supplemental folic acid were variable and inconclusive. The implications of increased placental and fetal growth up to day 45 of gestation in the first and third parity sows is discussed. In the third experiment (Chapter V), a decline in serum folate concentration in pregnant sows from mating to mid- to late gestation was clearly demonstrated. Supplementing the sow's diet with folic acid over a range of 0 to 4 ppm resulted in a linear increase in serum folate concentration at mating, during gestation and at weaning. However, under the conditions of this experiment, folic acid supplementation had no significant effect on sow reproductive performance.Ph. D.
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Simões, Vasco Jorge Gaspar. "Variations in the vulvar temperature of sows as determined by infrared thermography and its relation to ovulation." Master's thesis, Universidade Técnica de Lisboa. Faculdade de Medicina Veterinária, 2012. http://hdl.handle.net/10400.5/4822.
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Dissertação de Mestrado Integrado em Medicina VeterináriaThe productive results of a pig’s herd are closely related to the reproductive performance of their animals. Although in the last years several techniques were implemented to improve the reproductive efficiency of pig production, such as artificial insemination (AI) and estrus synchronization, the prediction of ovulation continues to be made with some degree of uncertainty due to the lack of an accurate, practical and fast technique. In this experimental study, we tested the applicability of infrared thermography (IRT) for ovulation prediction, based on the variations observed in the vulvar skin temperature (VST) during the proestrus and estrus period. The group tested was composed by 36 crossbred Large White x Landrace females, of which 6 gilts and 30 multiparous sows. Estrus detection was performed twice daily in the morning and afternoon, starting one day after weaning (day 1). Temperature measurements were performed every 6 hours at 0000h, 0600h, 1200h and 1800h, from day 1 to day 7. Temperature was obtained from the vulvar area and from two marked spots in the gluteal area (GST), which worked as a control. A third variable (VGT) was obtained from the differential temperature between VST and GST. Ovary ultrasonography was performed in days 5 and 6, in order to detect ovulation; however, the exams were inconclusive and so a theoretical diagnosis of ovulation had to be established based on the weaning-to-estrus interval and the duration of estrus. The statistical analysis focused mainly in the VGT of two sub-groups of animals, starting estrus at days 4 and 5. The VGT increased progressively during the proestrus (p = 0.003 and p=0.017), reaching a peak 61 ± 10.8 h and 82 ± 6.6 h before expected time of ovulation (eOv) in group D4 and D5, respectively. After this point, it decreased significantly (p = 0.002), reaching a lowest point 25 ± 10.8 h and 28 ± 6.6 h before eOv. Although the occurrence of ovulation could not be determined but only estimated, we believe the variations found in the VGT reflect the variations in the estradiol blood levels that will, indirectly, lead to the occurrence of ovulation. Even if no statistical relationship between vulvar temperature and ovulation could be established, the results suggest that these temperature variations may be indirectly related to the occurrence of ovulation.
RESUMO - VARIAÇÕES NA TEMPERATURA VULVAR EM PORCAS DETERMINADAS POR TERMOGRAFIA DE INFRAVERMELHOS E A SUA RELAÇÃO COM OVULAÇÃO - Os resultados produtivos de uma exploração de suínos estão intimamente relacionados com o desempenho reprodutivo dos seus animais. Apesar de nos últimos anos várias técnicas terem sido implementadas com vista a melhorar a eficiência deste sector, como inseminação artificial e sincronização do estro, prever a ocorrência de ovulação continua a envolver um certo grau de incerteza, dada a inexistência de uma técnica precisa, prática e rápida. Neste estudo experimental foi testada a aplicabilidade da termografia de infravermelhos (IRT) para predição da ovulação, tendo por base as variações de temperatura registadas ao nível da região vulvar (VST) ao longo do pró-estro e estro. O grupo-teste era composto por 36 porcas cruzadas Large White x Landrace, das quais 6 eram marrãs e 30 porcas multíparas. A detecção do estro iniciou-se 1 dia após o desmame (dia 1), sendo realizada duas vezes por dia, de manhã e à tarde. As medições de temperatura foram realizadas a intervalos de 6 horas, às 0000h, 0600h, 1200h e 1800h, entre o dia 1 e dia 7. Foi avaliada a temperatura vulvar e de 2 pontos marcados na região gluteal (GST) que desempenharam o papel de controlos. Uma terceira variável (VGT) foi obtida a partir do diferencial de temperatura entre a VST e GST. Com vista a detectar a ovulação, foram realizadas ecografias aos ovários durante os dias 5 e 6; no entanto, os resultados foram inconclusivos, pelo que a ocorrência de ovulação foi estimada a partir do intervalo desmame-estro e duração do estro. A análise estatística centrou-se sobretudo na variável VGT de dois sub-grupos, compreendendo animais com início de estro no dia 4 e dia 5. A VGT aumentou durante o pró-estro (p=0.003 e p=0.017 para os grupos D4 e D5), atingindo um pico 61 ± 10.8 h and 82 ± 6.6 h antes da ocorrência estimada de ovulação (eOv). De seguida, diminuiu significativamente (p=0.002), atingindo um valor mínimo 25 ± 10.8 h e 28 ± 6.6 h antes da ocorrência estimada da ovulação. Ainda que a ovulação não possa ter sido determinada com rigor, entendemos que as variações observadas na VGT reflectem as variações nos níveis sanguíneos de estradiol que, indirectamente, vão levar à ovulação. Assim, apesar não ter sido demonstrada uma relação inequívoca, os nossos resultados apontam para uma possível relação indirecta entre as variações de temperatura vulvar e a ovulação.
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Stone, B. A. (Bronte Allan). "Biochemical aspects of early pregnancy in the sow." 1985. http://web4.library.adelaide.edu.au/theses/09PH/09phs8771.pdf.
Full textAbstract:
Typescript (photocopy). Thesis submitted under title: Biochemical aspects of early pregnancy in the pig; but doctorate conferred to title: Biochemical aspects of early pregnancy in the sow Includes bibliographical references (leaves 178-205) and list of personal publications related to pig physiology (leaves vi-vii) Examines aspects of early pregnancy in pigs, aimed to identify determinants of the high level of embryonic mortality which occurs prior to implantation
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Stone, B. A. (Bronte Allan). "Biochemical aspects of early pregnancy in the pig." Thesis, 1985. http://hdl.handle.net/2440/21535.
Full textAbstract:
Typescript (photocopy).Thesis submitted under title: Biochemical aspects of early pregnancy in the pig; but doctorate conferred to title: Biochemical aspects of early pregnancy in the sow
Includes bibliographical references (leaves 178-205) and list of personal publications related to pig physiology (leaves vi-vii)
xi, 205 leaves : ill ; 30 cm.
Examines aspects of early pregnancy in pigs, aimed to identify determinants of the high level of embryonic mortality which occurs prior to implantation
Thesis (Ph.D.) -- University of Adelaide, Dept. of Obstetrics and Gynaecology,1985
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Stone, B. A. (Bronte Allan). "Biochemical aspects of early pregnancy in the pig / by Bronte Allan Stone." 1985. http://hdl.handle.net/2440/21535.
Full textAbstract:
Typescript (photocopy).Thesis submitted under title: Biochemical aspects of early pregnancy in the pig; but doctorate conferred to title: Biochemical aspects of early pregnancy in the sow
Includes bibliographical references (leaves 178-205) and list of personal publications related to pig physiology (leaves vi-vii)
Roseworthy Library copy has original title.
xi, 205 leaves : ill ; 30 cm.
Title page, contents and abstract only. The complete thesis in print form is available from the University Library.
Examines aspects of early pregnancy in pigs, aimed to identify determinants of the high level of embryonic mortality which occurs prior to implantation
Thesis (Ph.D.)--University of Adelaide, Dept. of Obstetrics and Gynaecology,1985
Books on the topic "Sows Reproduction; Swine Pregnancy"
1
Hulten, Fredrik. Group-housing of lactating sows: Effects on sow health, reproduction and litter performance. Uppsala: Sveriges Lantbruksuniversitet, 1997.
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2
Sterning, Marie. Reproductive performance and oestrous symptoms in primiparous sows. Uppsala: Sveriges Lantbruksuniversitet, 1996.
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3
Thilander, Gisela. Studies on the porcine myometrium during the oestrous cycle, pregnancy and parturition. Uppsala: Sveriges Lantbruksuniversitet, 1989.
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4
Tsuma, Victor T. Clincal and endocrine studies in primiparous sows: Effects of weaning during lactation and of group housing and fasting during early pregnancy. Uppsala: Sveriges Lantbruksuniversitet, 1995.
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5
Lantbruksuniversitet, Sveriges, ed. Studies of the endometrium and placenta during early pregnancy in the pig: Morphology, growth factors and steroid receptors. Uppsala: Sveriges Lantbruksuniversitet, 1996.
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6
Parmley, Katrine Louise Swanson. Lipogenesis and esterification aspects of the adipose tissue adaptation to energy intake in pregnant and lactating swine. 1993.
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