Improvement of Reproductive Efficiency in the Early Postpartum Cow Using Embryo Transfer PDF Download
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Author: Clifford Glenn Dorn
Publisher:
ISBN:
Category : Cattle
Languages : en
Pages : 214
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Author: Clifford Glenn Dorn
Publisher:
ISBN:
Category : Cattle
Languages : en
Pages : 214
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Book Description
Author: Peter J. H. Ball
Publisher: John Wiley & Sons
ISBN: 1405148012
Category : Medical
Languages : en
Pages : 248
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Book Description
Cattle play a fundamental role in animal agriculture throughout the world. They not only provide us with a vital food source, but they also provide us with fertilizer and fuel. Keeping reproduction levels at an optimum level is therefore essential, but this is often a complicated process, especially with modern, high yielding cows. Written in a practical and user-friendly style, this book aims to help the reader understand cattle reproduction by explaining the underlying physiology of the reproductive process and the role and importance of pharmacology and technology, and showing how management techniques can improve reproductive efficiency. This edition includes: Recent research findings on the physiology of the oestrous cycle and its control; New techniques for monitoring and manipulating reproduction, including pregnancy diagnosis and embryo transfer; Advice on identifying common infertility problems and how to prevent and treat them. Reproduction Cattle 3e is essential reading for veterinary and agricultural students, as well as veterinarians and farmers involved in cattle reproduction.
Author: Katylyn Jo Richardson
Publisher:
ISBN:
Category : Cattle
Languages : en
Pages : 0
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Book Description
A series of studies were completed to determine if reproductive efficiency and offspring performance could be improved through the implementation of a novel method of embryonic selection and the proliferation of a desirable genotype in cattle. The first study evaluated the effectiveness of an Embryo Chamber to distinguish between viable and nonviable bovine embryos based on specific gravity of the embryo. In this study, 19 in vitro produced (IVP) and 15 in vivo derived (IVD) Grade 1 embryos were individually placed into a 0.5 mL semen straw of media and allowed to descend through the Embryo Chamber. Descent time through a vertical, one-centimeter timing region was recorded, and embryos were removed from the chamber and either transferred into recipient females or cryopreserved and transferred at a later date. In order to determine if Embryo Chamber evaluation had an effect on pregnancy status, 27 IVP and 12 IVD, Grade 1 embryos that were not evaluated with the Embryo Chamber were also transferred into recipient females at the time of project embryo transfer. Pregnancy was later determined via rectal ultrasound and recorded. There was no significant difference in conception rates between embryos evaluated with the Embryo Chamber and those not evaluated with the Embryo Chamber, indicating that chamber analysis had no negative impact on viability of both IVP (P = 0.54) and IVD (P = 0.93) embryos. Of the 34 total embryos evaluated with the Embryo Chamber, 22 resulted in successful implantation and pregnancy, with 13 pregnancies (68.4%) by IVP embryos and 9 (60%) by IVD. There was no difference in average descent time of pregnant and non-pregnant embryos for IVP (P = 0.54) or IVD embryos (P = 0.24). When divided into groups according to descent time, 32% of all observations for IVP embryos occurred between 30 to 50 s with a 66.7% conception rate, and 42% occurred between 70 to 90 s with a 75% conception rate (P = 0.85). For IVD, 60% of all observations occurred between 90 to 110 s, with a conception rate of 66.7% (P = 0.35). Analysis of the correlation between descent group and pregnancy outcome or descent time and pregnancy outcome showed no strong correlation for either production method. Though not significant, the trends highlighted in this data lend support to previous research with variations of the Specific Gravity Device. Further research is needed to thoroughly evaluate the potential of this technology as a method of noninvasive assessment of embryo quality. The second study evaluated the merit of an F1 USDA Prime, Yield Grade 1 carcass clone sire as a terminal sire in the beef x dairy production system. In this study, the clone sire, AxG1, and a purebred Angus reference sire, Foundation, were bred to dairy cows (n = 1,430) at a commercial Jersey dairy in the Texas Panhandle. Performance data from resulting offspring of these matings was collected and analyzed to assess differences in performance between the two sires. Post-partum dam data was also collected to determine if there were any negative impacts of sire on the subsequent reproductive performance of the dams. Conception rates were 39% for AxG1 and 30% for Foundation (P
Author: Richard M. Hopper
Publisher: John Wiley & Sons
ISBN: 1118470850
Category : Medical
Languages : en
Pages : 2206
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Book Description
Bovine Reproduction is a comprehensive, current reference providing information on all aspects of reproduction in the bull and cow. Offering fundamental knowledge on evaluating and restoring fertility in the bovine patient, the book also places information in the context of herd health where appropriate for a truly global view of bovine theriogenology. Printed in full color throughout, the book includes 83 chapters and more than 550 images, making it the most exhaustive reference available on this topic. Each section covers anatomy and physiology, breeding management, and reproductive surgery, as well as obstetrics and pregnancy wastage in the cow. Bovine Reproduction is a welcome resource for bovine practitioners, theriogenologists, and animal scientists, as well as veterinary students and residents with an interest in the cow.
Author: Abdalla A. Zaied
Publisher:
ISBN:
Category :
Languages : en
Pages : 204
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 64
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Author: George E. Seidel
Publisher: Australian Geographic
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 184
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Author: McKenzie R. Corpron
Publisher:
ISBN:
Category : Beef cattle
Languages : en
Pages : 252
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Book Description
Less than 10% of beef cow-calf producers in the United States currently implement reproductive technologies such as estrous synchronization and artificial insemination (AI) as a component of their breeding management program. Synchronization protocols aid in the synchrony of estrus and ovulation to improve cattle fertility, however, many protocols often require multiple hormone injections and animal handlings. Development of estrous synchronization protocols that limit number of injections, cost, and labor inputs, without compromising fertility, may improve the adoption of fixed-time artificial insemination (FTAI) within the beef industry. The main objective of the first study was to compare the effect of a single injection of high-concentration (HICON) prostaglandin F2[alpha] (PGF) or two conventional PGF injections (2PGF) administered 8 h apart at controlled internal drug release insert (CIDR) removal, on reducing serum progesterone (P4) before FTAI and on subsequent pregnancy per artificial insemination (P/AI) in postpartum beef cows (n=404) synchronized with a 5-d CO-Synch + CIDR breeding program. Serum P4 concentration at the time of insemination is a determining factor of cattle fertility in FTAI protocols, as lower concentrations have been associated with increased P/AI. A secondary objective of the first study was to assess the relationship between P4 concentration at the time of insemination and probability of pregnancy to AI. Progesterone concentrations at AI were lesser in 2PGF than HICON, however, P/AI was not different between treatments. Probability of pregnancy decreased as P4 concentration at AI increased and the optimal P4 cutoff concentration to optimize fertility was determined at 0.43 ng/mL. Intramuscular (i.m.) route of injection is commonly used to administer products used in estrous synchronization in beef cattle; however, this route causes greater incidence of injection-site lesions and tissue damage associated with reduced beef carcass quality and tenderness than subcutaneous (s.c.) routes. Therefore, use of s.c. administration is favorable to reduce carcass damage. The objective of the second study was to compare the ability of a single s.c. injection of high-concentration PGF (HICON-SC) with two i.m. injections of conventional PGF 6 h apart (2PGF-IM) to reduce P4 concentration and induce luteolysis by the time of AI in a 5-d CO-Synch + CIDR synchronization program in postpartum beef cows. A similar decline in P4 concentration occurred in both treatments following PGF, indicating s.c. administration of HICON could be an effective alternative to i.m. administration of the conventional double PGF dose to induce luteolysis before AI in the 5-d CO-Synch + CIDR protocol.
Author: Fuller W. Bazer
Publisher: Academic Press
ISBN: 0128170530
Category : Technology & Engineering
Languages : en
Pages : 560
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Book Description
Animal Agriculture: Sustainability, Challenges and Innovations discusses the land-based production of high-quality protein by livestock and poultry and how it plays an important role in improving human nutrition, growth and health. With exponential growth of the global population and marked rises in meat consumption per capita, demands for animal-source protein are expected to increase 72% between 2013 and 2050. This raises concerns about the sustainability and environmental impacts of animal agriculture. An attractive solution to meeting increasing needs for animal products and mitigating undesirable effects of agricultural practices is to enhance the efficiency of animal growth, reproduction, and lactation. Currently, there is no resource that offers specific knowledge of both animal science and technology, including biotechnology for the sustainability of animal agriculture for the expanding global demand of food in the face of diminishing resources. This book fills that gap, giving readers all the necessary information on important issues facing modern animal agriculture, namely its sustainability, challenges and innovative solutions. - Integrates new knowledge in animal breeding, biotechnology, nutrition, reproduction and management - Addresses the urgent issue of sustainability in modern animal agriculture - Provides practical solutions on how to solve the current and future problems that face animal agriculture worldwide
Author: Valery Theresa Cypser
Publisher:
ISBN:
Category : Dairy cattle
Languages : en
Pages : 140
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Book Description
