Download or read book Improving Reproductive Efficiency in Dairy Cattle written by R. D. Smith and published by . This book was released on 1980 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Development of Methods for Improving Reproductive Efficiency in Dairy Cattle and Investigations of Reproductive Hormone Interrelationships in the Postpartum Dairy Cow written by Abdalla A. Zaied and published by . This book was released on 1979 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Breeding and management strategies to improve reproductive efficiency in dairy cattle written by D. J. Ambrose and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Strategies to Improve Reproductive Efficiency Through Systematic Breeding Programs in Dairy Cows written by Rabiou Manzo and published by . This book was released on 2003 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Genomically Enhanced Predictions of Dairy Cattle Fertility written by Emily Marie Sitko and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Research presented in this thesis aimed at improving the efficiency of dairy farms through the development of targeted reproductive management strategies (TRM) based on genomically enhanced predictions of fertility, and the elucidation of associations between genetic merit for fertility and biological outcomes that affect dairy cow reproductive performance.Chapter II and III present the results of an experiment designed to compare the association between genetic merit for fertility and reproductive and profitability outcomes of cows submitted for artificial insemination (AI) with management programs that prioritized AI at detected estrus (AIE) or timed AI (TAI). Another objective was to determine if cows with different genetic potential for fertility would present a distinct response to the strategies compared. The study presented in Chapter IV and V characterized associations between genetic merit for fertility and biological parameters known to alter reproductive performance of cows. Results presented in Chapter II and III indicated that primiparous Holstein cows of superior genetic merit for fertility had better reproductive performance than cows of inferior genetic merit for fertility regardless of the type of reproductive management used. In addition, the effect of TRM based on genetic merit for fertility on reproductive performance depended on the outcome or sets of outcomes of interest evaluated. For example, cows of superior and intermediate genetic merit for fertility had greater P/AI when managed with the predominant TAI program but reduced days to pregnancy when managed with the program that prioritized AIE. Cows of inferior fertility also had greater first service P/AI with the program that prioritized TAI but had similar days to pregnancy with both management strategies. From an economic standpoint, cows of inferior fertility had greater cash flow than cows of superior fertility. For cows in specific fertility groups, the effects of the reproductive management strategies compared generated differences in cash flow of potential value for commercial dairy farms. The study presented in Chapter IV and V demonstrated a potential association of genomic merit for fertility with physiological and endocrine parameters known to affect reproductive performance of dairy cows. Particularly, cows of inferior genetic merit for fertility had poorer uterine health, decreased response to synchronization of estrus and ovulation, and were more likely to present altered ovarian and hormonal phenotypes that led to more frequent expression of atypical estrous cycles as compared with cows of superior genetic merit for fertility. Overall, we observed that genetically enhanced predictions of fertility might be a suitable tool for decision making in TRM. Additionally, the value of TRM programs for cows of different genetic merit for fertility might be on improving aspects of herd management such as simplifying program implementation or reducing reliance on hormonal interventions while maintaining acceptable levels of reproductive performance. An improved understanding of biological differences associated with genetic variation, such as our observations in Chapter IV and V, may be beneficial for the development of novel TRM and technologies to improve the reproductive efficiency of dairy cattle. This novel information could also support the development of new traits for selection of fertility.
Download or read book Reproduction in Cattle written by Peter J. H. Ball and published by John Wiley & Sons. This book was released on 2008-04-15 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Improving Reproductive Performance Through the Development of a Dairy Heard Index Intrauterine Hormone Delivery Or Insemination Technique in Lactating Cows written by Santiago Bas and published by . This book was released on 2013 with total page 197 pages. Available in PDF, EPUB and Kindle. Book excerpt: Improving reproductive performance of dairy cattle is paramount to maximize productivity and sustainability of dairy operations. The present dissertation includes three specific aims containing a series of five experiments (Chapters) aimed at improving reproductive performance in lactating dairy cows. The first specific aim (Chapters 3 and 4) evaluated the effectiveness of using protective plastic sheaths to minimize vaginal contamination of the AI catheter at the time of AI and pregnancies per AI in lactating dairy cows inseminated with or without the use plastic sheaths. In addition, the economic benefit of using plastic sheaths within a herd was estimated (Chapter 4). Using plastic sheaths at the time of AI resulted in reduced contamination of the AI catheter and improved pregnancies per AI for second or greater services in lactating dairy cows. Additionally, the use of plastic sheaths increased herd profitability by improving overall pregnancies per AI at a minimal cost. This first specific aim show the importance of reducing bacterial contamination at the time of AI, which should not be disregarded by AI technicians, in order to achieve consistent reproductive outcomes over time.
Download or read book Studies on the Reproductive Efficiency of Cattle Using Radioimmunoassay Techniques written by International Atomic Energy Agency and published by . This book was released on 1990 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of a final research co-ordination meeting, Vienna, 5-9 September 1988. The 13 individual papers presented at the meeting are included in this publication and represent a synthesis of the work carried out under the co-ordinated research programme initiated in 1982 with the aim of stimulating studies to characterize and improve the reproductive performance of indigenous cattle under the diverse environmental and management conditions prevailing in developing countries.
Download or read book Dairy Cattle Fertility Sterility written by and published by Hoard's Dairyman Books. This book was released on 1996 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bovine Reproduction written by Richard M. Hopper and published by John Wiley & Sons. This book was released on 2014-08-18 with total page 2206 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Improving Productivity and Reproductive Efficiency of Smallholder Dairy Cows in Kenya written by Joan Muraya and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The aims of this research were: 1) to gain a better understanding of the productive and reproductive outputs of the smallholder dairy farms (SDF); 2) to determine the factors and prevalence of selected reproductive diseases potentially affecting these outputs; and 3) to assess the use of sexed semen and reproductive hormones in improving reproductive efficiency of these cows. The research was done in the Meru area of Kenya. A cross-sectional study was conducted to assess farm management, milk production and reproductive performance of 314 lactating cows. Two hundred smallholder farms were randomly selected from the entire sampling frame of active members of Naari Dairy Farmers Co-operative Society. Farms were visited once within the three month study period, a questionnaire administered to the farmers for risk factors associated with milk yield, and animals were examined for physical and reproductive health. A multivariable mixed linear regression model of log milk/cow/day was constructed; accounting for confounding, cow clustering within farms and days in milk. The average body condition score and milk produced were 2.4 and 6.7 kg/cow/day, respectively, with 43.4% of the cows having been bred or pregnant at the time. Almost a third of all lactating cows were anestrous, and the average days in milk was 300. In the multivariable model, log of milk yield was positively associated with increasing weight of the animals, feeding concentrates (dairy meal) on the last month of gestation, and increasing percentage of land allocated for growing fodder for dairy cows. The indigenous breed category was negatively associated with log of milk yield. Cycling and confirmed pregnant cows both had higher milk production than early pregnant and anestrous cows.
Download or read book Improving Reproductive Performance of Cattle Through the Development of Novel Management Strategies and Technologies written by Magdalena Masello Souza and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objectives of the studies presented in Section I were to evaluate insemination dynamics, time to pregnancy, and profitability of replacement dairy heifers managed with first service programs that relied primarily on insemination at detected estrus (AIE), timed-artificial insemination (TAI), or a combination of both. The objectives of the experiments presented in Section II were; to develop and validate a tool integrating a disposable fluorescence-based lateral flow immunoassay (LFIA) coupled with a portable imaging device to determine the reproductive status of cows based on circulating progesterone (P4) concentration; to test the efficacy of intravaginal (IVG) administration of prostaglandin-F2_ (PGF) to induce corpus luteum (CL) regression; and to develop and validate an electronically-controlled hormone delivery device for reproductive control of cattle. The studies presented in Section I demonstrated that a reproductive management strategy designed to submit all heifers to TAI reduced time to first AI and time to pregnancy when compared with a strategy that relied primarily on AIE after induction of estrus with PGF treatments. The program that combined AIE and TAI resulted in intermediate performance. In spite of greater reproductive cost, programs that used TAI in combination with AIE or solely TAI reduced rearing cost and generated more revenue during first lactation, which translated in numerically greater cash flow under fixed or simulated market conditions. The first experiment of Section II demonstrated that the developed LFIA system can accurately predict the presence of a functional CL (i.e., P4 ≥ 1 ng/mL) using bovine plasma samples. Additional improvements of this assay may lead to the development of a rapid, low-cost, cow-side tool for determination of reproductive status of cattle. The other experiments presented in Section II demonstrated that two IVG treatments of PGF 12 hours apart resulted in similar luteal regression risk, estrus expression, ovulatory response to GnRH, and pregnancy per AI compared with that observed after a single intramuscular dose of PGF. Further, we demonstrated that the current IVG prototype device for hormone delivery can be programmed to automatically release PGF for successful induction of luteal regression in cattle. Once optimized, the developed IVG device may be an alternative too to the needle-injection methods presently used to synchronize ovulation of cows.
Download or read book Advances in dairy cattle breeding to improve fertility reproductive efficiency written by Mekonnen Haile-Mariam and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dairy Cows written by Catherine T. Hernandez and published by Nova Science Publishers. This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: 1. A novel, illustrated classification system to define the causes of bovine perinatal mortality internationally / John F. Mee -- 2. Resetting priorities for sustainable dairy farming under global changing / I. Blanco-Penedo, J. Perea, J.O.L. Cerqueira and R. Payan-Carreira -- 3. Somatic cell count as the factor conditioning productivity of various breeds of cows and technological suitability of milk / Joanna Barlowska, Zygmunt Litwińczuk, Aneta Brodziak and Jolanta Król -- 4. Strategies to improve the reproductive efficiency of dairy cattle / L.S.R. Marinho, F.Z. Machado and M.M. Seneda.
Download or read book Maintaining Maximum Reproductive Efficiency in Georgia Dairy Herds written by James Nelson Maddux and published by . This book was released on 1969 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fertility in the High Producing Dairy Cow written by M. G. Diskin and published by . This book was released on 2001 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt: The modern genetically improved dairy cow produces large quantities of milk but suffers from poor reproductive efficiency. This has a major impact on farm incomes. These two volumes review the causes of reproductive decline and low fertility.
Download or read book Improving Reproductive Efficiency in Beef Cattle written by and published by . This book was released on 1971 with total page 103 pages. Available in PDF, EPUB and Kindle. Book excerpt:
