Strategic Progesterone Testing as a Method to Predict Conception and Manage Reproduction in Dairy Cows PDF Download
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Author: Laura J. Wilsdorf Publisher: ISBN: Category : Languages : en Pages : 102
Book Description
Timed AI (TAI) programs have increased reproductive efficiency in dairy herds, but conception rates to TAI remain below 50% for most herds. The low TAI pregnancies per AI (P/AI) is partially explained by cows that do not have a CL when PGF2[alpha] is administered, fail to undergo luteolysis after PGF2[alpha] or fail to ovulate after GnRH and TAI. Cows falling into one of these three categories are known to have low fertility after TAI. We hypothesized that testing milk progesterone concentrations on-farm would provide information on predicting pregnancy. The objective of the first experiment was to validate the milk progesterone auto analyzer (FT Multilyser; Förster Technik). The milk auto analyzer was subjected to trials for validation including milk added mass, serial dilution, comparing 2 auto analyzers, comparing with a radioimmunoassay, validation with biology, validation with PAGs and progesterone, and testing how quickly PGF2[alpha] takes effect. We found that the milk auto analyzer is a valuable tool in assessing milk progesterone. Next a modified, extended 7 day CIDR program was tested compared with Presynch Ovsynch56. Cows in the treatment group with low progesterone before the final PGF2[alpha] injection had a CIDR inserted and were inseminated 1 week later. There was a numerical increase in P/AI for CIDR treated cows, but additional tests are needed. ROC (Receiver Operator Characteristic) curves for predicting conception or pregnancy were then tested. We found milk progesterone ROCs (-3 and +7 d) and blood plasma (-3 and +25 d) had some capacity to predict pregnancy to timed AI. We concluded most cows not responding to a TAI protocol could be identified and may benefit from an alternative program. The milk auto analyzer may be a useful on-farm tool and ROC curves have some capacity to predict pregnancy based on progesterone concentrations around TAI.
Author: Peter J. H. Ball Publisher: John Wiley & Sons ISBN: 1405148012 Category : Medical Languages : en Pages : 248
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: National Research Council Publisher: National Academies Press ISBN: 0309264944 Category : Technology & Engineering Languages : en Pages : 399
Book Description
Using Science to Improve the BLM Wild Horse and Burro Program: A Way Forward reviews the science that underpins the Bureau of Land Management's oversight of free-ranging horses and burros on federal public lands in the western United States, concluding that constructive changes could be implemented. The Wild Horse and Burro Program has not used scientifically rigorous methods to estimate the population sizes of horses and burros, to model the effects of management actions on the animals, or to assess the availability and use of forage on rangelands. Evidence suggests that horse populations are growing by 15 to 20 percent each year, a level that is unsustainable for maintaining healthy horse populations as well as healthy ecosystems. Promising fertility-control methods are available to help limit this population growth, however. In addition, science-based methods exist for improving population estimates, predicting the effects of management practices in order to maintain genetically diverse, healthy populations, and estimating the productivity of rangelands. Greater transparency in how science-based methods are used to inform management decisions may help increase public confidence in the Wild Horse and Burro Program.
Author: Laura J. Wilsdorf Publisher: ISBN: Category : Languages : en Pages : 102
Book Description
Timed AI (TAI) programs have increased reproductive efficiency in dairy herds, but conception rates to TAI remain below 50% for most herds. The low TAI pregnancies per AI (P/AI) is partially explained by cows that do not have a CL when PGF2[alpha] is administered, fail to undergo luteolysis after PGF2[alpha] or fail to ovulate after GnRH and TAI. Cows falling into one of these three categories are known to have low fertility after TAI. We hypothesized that testing milk progesterone concentrations on-farm would provide information on predicting pregnancy. The objective of the first experiment was to validate the milk progesterone auto analyzer (FT Multilyser; Förster Technik). The milk auto analyzer was subjected to trials for validation including milk added mass, serial dilution, comparing 2 auto analyzers, comparing with a radioimmunoassay, validation with biology, validation with PAGs and progesterone, and testing how quickly PGF2[alpha] takes effect. We found that the milk auto analyzer is a valuable tool in assessing milk progesterone. Next a modified, extended 7 day CIDR program was tested compared with Presynch Ovsynch56. Cows in the treatment group with low progesterone before the final PGF2[alpha] injection had a CIDR inserted and were inseminated 1 week later. There was a numerical increase in P/AI for CIDR treated cows, but additional tests are needed. ROC (Receiver Operator Characteristic) curves for predicting conception or pregnancy were then tested. We found milk progesterone ROCs (-3 and +7 d) and blood plasma (-3 and +25 d) had some capacity to predict pregnancy to timed AI. We concluded most cows not responding to a TAI protocol could be identified and may benefit from an alternative program. The milk auto analyzer may be a useful on-farm tool and ROC curves have some capacity to predict pregnancy based on progesterone concentrations around TAI.
Author: Richard M. Hopper Publisher: John Wiley & Sons ISBN: 1118470850 Category : Medical Languages : en Pages : 2206
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: W Haresign Publisher: Elsevier ISBN: 1483103536 Category : Technology & Engineering Languages : en Pages : 378
Book Description
Recent Developments in Ruminant Nutrition presents papers that discuss the advancement of the different areas of ruminant nutrition. The book is comprised of 20 chapters that cover topics, such as reproduction, diet, and nutrition. The coverage of the text includes growth stimulation in ruminants; protein quantity and quality for the U.K. dairy cow; and complete-diet feeding of dairy cows. The book also covers rumen fermentation related topics, such as influence of nitrogen and carbohydrate inputs on rumen fermentation; aspects of the biochemistry of rumen fermentation and their implication in ruminant productivity; and manipulation of rumen fermentation. The text will be of great use to researchers and professionals in the animal husbandry industry.
Author: Robert H. Weichbrod Publisher: CRC Press ISBN: 1498748457 Category : Medical Languages : en Pages : 917
Book Description
AAP Prose Award Finalist 2018/19 Management of Animal Care and Use Programs in Research, Education, and Testing, Second Edition is the extensively expanded revision of the popular Management of Laboratory Animal Care and Use Programs book published earlier this century. Following in the footsteps of the first edition, this revision serves as a first line management resource, providing for strong advocacy for advancing quality animal welfare and science worldwide, and continues as a valuable seminal reference for those engaged in all types of programs involving animal care and use. The new edition has more than doubled the number of chapters in the original volume to present a more comprehensive overview of the current breadth and depth of the field with applicability to an international audience. Readers are provided with the latest information and resource and reference material from authors who are noted experts in their field. The book: - Emphasizes the importance of developing a collaborative culture of care within an animal care and use program and provides information about how behavioral management through animal training can play an integral role in a veterinary health program - Provides a new section on Environment and Housing, containing chapters that focus on management considerations of housing and enrichment delineated by species - Expands coverage of regulatory oversight and compliance, assessment, and assurance issues and processes, including a greater discussion of globalization and harmonizing cultural and regulatory issues - Includes more in-depth treatment throughout the book of critical topics in program management, physical plant, animal health, and husbandry. Biomedical research using animals requires administrators and managers who are knowledgeable and highly skilled. They must adapt to the complexity of rapidly-changing technologies, balance research goals with a thorough understanding of regulatory requirements and guidelines, and know how to work with a multi-generational, multi-cultural workforce. This book is the ideal resource for these professionals. It also serves as an indispensable resource text for certification exams and credentialing boards for a multitude of professional societies Co-publishers on the second edition are: ACLAM (American College of Laboratory Animal Medicine); ECLAM (European College of Laboratory Animal Medicine); IACLAM (International Colleges of Laboratory Animal Medicine); JCLAM (Japanese College of Laboratory Animal Medicine); KCLAM (Korean College of Laboratory Animal Medicine); CALAS (Canadian Association of Laboratory Animal Medicine); LAMA (Laboratory Animal Management Association); and IAT (Institute of Animal Technology).
Author: Fuller W. Bazer Publisher: Springer Science & Business Media ISBN: 1461218047 Category : Medical Languages : en Pages : 579
Book Description
A comprehensive, cutting-edge review of the complex interactions between maternal and fetal-placental tissues that control the establishment and maintenance of pregnancy, the proper development of the fetus, the birth process, and the behavioral aspects of bonding between mother and newborn. Expert researchers review the endocrine and physiological events that culminate in the delivery of offspring, and provide a solid base of comparative information on the menstrual cycle of primates, including humans. They also discuss the sources and functions of both steroid and protein hormones from the placenta and the details of their effects on uterine function, placental development, fetal growth and well-being, and maternal responses to pregnancy. This book will become the standard reference source not only for reproductive scientists, but also for those clinicians who want better to understand the complex factors that affect pregnancy-and their pregnant patients.
Author: Laura J. Wilsdorf
Author: Peter J. H. Ball
Author: National Research Council
Author: Laura J. Wilsdorf
Author: Richard M. Hopper
Author: W Haresign
Author: B. G. Lowman
Author: Robert H. Weichbrod
Author: H. H. Van Horn
Author: Phillip L. Senger
Author: Fuller W. Bazer