Download or read book The Effects of Nutrition on Reproductive Physiology and Growth in Beef Heifers written by James Edward Blakely and published by . This book was released on 1964 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt: Forty-eight Hereford heifers averaging 690 pounds were randomly assigned to three groups or 16 heifers each and wintered at three planes of nutrition from October 15, 1962 to May 27, 1963 (224 days). Daily rations were adequate in protein and high (12.65 1b. TDN), medium (9.66 1b. TDN) or low (4.24 1b. TDN) in energy. Slaughter data was obtained and a bioassay of the pituitary conduced. Heifers were exposed to bulls March 7, 1963 and pregnancy examinations were by rectal palpations. Fifteen of 16 heifers bred in lots fed a high energy ration were examined pregnant as compared to 14 of 15 heifers bred in lots fed a medium ration. Two heifers in the low energy lot bred and only one conceived. All were showing signs of estrus at the start of the trial but no visual signs could be detected in the low energy group at the time of breeding. Thyroid secretion rates were estimated in November, February and May. A significant decrease (P

Download or read book Beef Heifer Development An Issue of Veterinary Clinics Food Animal Practice written by David J Patterson and published by Elsevier Health Sciences. This book was released on 2013-12-28 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt: The latest information on heifer development in beef cattle for the food animal practitioner! Topics include rebuilding the US cowherd, physiology and endocrinology of puberty, nutritional development and the target weight debate, long-term reproductive health, effect of prenatal programming on development, economics of development, synchronization of estrus and ovulation, post breeding heifer management, management strategies for adding value to heifers, and more!

Download or read book Factors Affecting Calf Crop written by Michael J. Fields and published by CRC Press. This book was released on 1993-11-23 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt: Factors Affecting Calf Crop summarizes the latest information available from leading cattle physiologists and geneticists regarding factors known to influence the production of live calves at weaning. You get practical information on management techniques for improving reproduction efficiency in the herd. You'll also learn about the functioning of the reproductive system and how this may affect reproductive processes in the cow herd. Managers will benefit from a clearer understanding of the factors known to limit efficient reproduction, while veterinarians and other professionals who advise cattlemen will appreciate the substantial reference material and color photographs for defining cow condition scores. Color photographs are also used to illustrate the discussions of testicular thermographies and their applications. Other chapters in the book cover developments in improving reproductive performance of the replacement heifer, the brood cow, and the bull. Topics on reproduction include physiology/endocrinology, the use of growth promotants, genetics and physiological and economic considerations in selecting the age to breed heifers, heritability of fertility, length of the breeding season, prepartum and postpartum nutrition, nursing by the calf, cloning of embryos, and much more.

Download or read book Effects of Nutrition on Reproductive Physiology and Performance in Dairy Cows and Sheep written by John Upton Fahey and published by . This book was released on 2001 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Physiological Effect on Growth and Reproduction of Rations Balanced from Restricted Sources written by Edwin Bret Hart and published by . This book was released on 1911 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Effects of Pre and Postweaning Nutrition on Fertility and Feed Efficiency in Beef Heifers written by Maggie K. Bloomsburg and published by . This book was released on 2018 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cattle in the Pacific Northwest graze a variety of forages which vary in quality. The effects of forage quality on heifer reproductive development and fertility is still under investigation. Therefore, the first objective was to investigate the effects of grazing different quality forages preweaning and postweaning on reproductive traits and feed efficiency in heifers. Although nutritional differences were present, pre- and postweaning treatments did not affect reproduction. This indicates different qualities of forage present in Idaho may be utilized for heifers. Feed costs represent a large portion of cattle producers' expenses. Selecting for feed efficiency allows producers to capitalize on these expenses. However, the effects of selecting for efficiency on reproduction is still undetermined. The second objective was to study the relationship between feed efficiency and reproductive development and fertility. No differences in reproductive traits were detected among heifers ranked as efficient, average or inefficient at utilizing feed for growth.

Download or read book Effects of Increased Nutruent Intake on Growth Reporduction and Productivity of Beef Heifers written by Shelby Lynn Rosasco and published by . This book was released on 2016 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two experiments were conducted to determine the influence of increased nutrient intake on beef heifer performance and reproductive efficiency. Experiment 1 evaluated the effect of heifer development supplementation regimen on heifer performance and reproduction during the pre- and post-breeding period. Heifers were developed grazing native range and supplemented to achieve 1) a constant rate of gain (CG) or 2) low rate of gain for the first half of development period followed by a high rate of gain for the remaining half of the development period (LoHi). Heifer performance was similar over the development period, with supplementation regimen having no effect on reproductive performance between treatments. Feed costs and costs to develop 1 pregnant heifer was decreased for LoHi heifer compared to CG heifers due to supplementation strategy. Following breeding heifers were stratified and randomly assigned to graze native pasture and supplemented at a low (CON) or high (High) rate for 30 d. CON heifer had a trend for increased AI pregnancy rate compared to High heifers, indicating a potential influence of nutrition on reproductive success. Accurately predicting forage nutrient composition during Exp. 1 impacted performance, altering predicted gains. In Exp. 2 heifers were individually fed a silage based diet to imitate treatments and predicted gains from Exp. 1. Heifer BW was similar among treatments over the development period. Although total ADG was similar among both treatment, ADG and intake was increased for CG heifers during the first 45 d, while LoHi heifer ADG and intake was increased over the last 45 d of the development period. Feed efficiency increased for LoHi heifers and decreased for CG heifers over the treatment period, indicating a potential compensatory gain effect. Reproductive traits measured were not impacted by development strategy; however, additional research is warranted to fully understand the impact of increased nutrient intake and compensatory gain on metabolic hormones, oocyte competence, and follicular microenvironment. In summary, these experiments provided further evidence of the impact of nutrition on reproductive performance, with future research warranted specifically investigating follicular fluid metabolic hormone concentrations and gene expression in oocytes and granulosa cells, and their impact on reproductive success.

Download or read book Nutrient Requirements of Beef Cattle written by Subcommittee on Beef Cattle Nutrition and published by National Academies Press. This book was released on 2000-05-16 with total page 249 pages. Available in PDF, EPUB and Kindle. Book excerpt: As members of the public becomes more concious of the food they consume and its content, higher standards are expected in the preparation of such food. The updated seventh edition of Nutrient Requirements of Beef Cattle explores the impact of cattle's biological, production, and environmental diversities, as well as variations on nutrient utilization and requirements. More enhanced than previous editions, this edition expands on the descriptions of cattle and their nutritional requirements taking management and environmental conditions into consideration. The book clearly communicates the current state of beef cattle nutrient requirements and animal variation by visually presenting related data via computer-generated models. Nutrient Requirements of Beef Cattle expounds on the effects of beef cattle body condition on the state of compensatory growth, takes an in-depth look at the variations in cattle type, and documents the important effects of the environment and stress on food intake. This volume also uses new data on the development of a fetus during pregnancy to prescribe nutrient requirements of gestating cattle more precisely. By focusing on factors such as product quality and environmental awareness, Nutrient Requirements of Beef Cattle presents standards and advisements for acceptable nutrients in a complete and conventional manner that promotes a more practical understanding and application.

Download or read book Nutrient Requirements of Beef Cattle written by National Academies of Sciences, Engineering, and Medicine and published by National Academies Press. This book was released on 2016-06-16 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since 1944, the National Research Council (NRC) has published seven editions of the Nutrient Requirements of Beef Cattle. This reference has guided nutritionists and other professionals in academia and the cattle and feed industries in developing and implementing nutritional and feeding programs for beef cattle. The cattle industry has undergone considerable changes since the seventh revised edition was published in 2000 and some of the requirements and recommendations set forth at that time are no longer relevant or appropriate. The eighth revised edition of the Nutrient Requirements of Beef Cattle builds on the previous editions. A great deal of new research has been published during the past 14 years and there is a large amount of new information for many nutrients. In addition to a thorough and current evaluation of the literature on the energy and nutrient requirements of beef in all stages of life, this volume includes new information about phosphorus and sulfur contents; a review of nutritional and feeding strategies to minimize nutrient losses in manure and reduce greenhouse gas production; a discussion of the effect of feeding on the nutritional quality and food safety of beef; new information about nutrient metabolism and utilization; new information on feed additives that alter rumen metabolism and postabsorptive metabolism; and future areas of needed research. The tables of feed ingredient composition are significantly updated. Nutrient Requirements of Beef Cattle represents a comprehensive review of the most recent information available on beef cattle nutrition and ingredient composition that will allow efficient, profitable, and environmentally conscious beef production.

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 Part I Effect of Plane of Winter Nutrition on Growth and Reproductive Performance of Beef Heifers Part II Effect of Nutrient Restriction on Weight Gains Feed Utilization and Body Composition of Male Rats written by J. Elton Zimmerman and published by . This book was released on 1960 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Methods of Hormone Radioimmunoassay written by Bernard Jaffe and published by Elsevier. This book was released on 2012-12-02 with total page 1071 pages. Available in PDF, EPUB and Kindle. Book excerpt: Methods of Hormone Radioimmunoassay, Second Edition is a compilation of radioimmunoassay techniques for the quantification of hormones. Various kinds of hormones are considered, namely: intracellular messengers; hypothalamic and pineal hormones; pituitary hormones; thyroid and parathyroid hormones; renal hormones; hormones of the gastrointestinal tract; pancreatic hormones; steroid hormones; uterine and placental hormones; vasoactive peptide hormones; and growth factors. The corresponding method of radioimmunoassay for each hormone is described. This book is comprised of 49 chapters and begins with a discussion on the radioimmunoassay of cyclic adenosine-3',5-monophosphate (cAMP) and cyclic guanosine-3,5'-monophosphate (cGMP), together with problems related to measuring both compounds. The reader is then introduced to prostaglandins and prostaglandin metabolites, thyrotropin-releasing hormone, and gonadotropin-releasing hormone. Pituitaty gonadotropins, prolactin, and thyrotropin are also discussed. The remaining chapters deal with hormones of the gastrointestinal tract, pancreatic hormones, steroid hormones, and growth factors. This monograph is intended for both clinicians and investigators interested in methods of hormone radioimmunoassay.

Download or read book Effects of Monensin and Nutrition on Reproductive Performance in Beef Heifers from Weaning Through First Postpartum Period written by Lesly Ray Sprott and published by . This book was released on 1981 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Use of Dietary Fat Supplementation on Growth Reproduction and Performance Characteristics of Replacement Beef Heifers written by Alex Santos and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of these studies was to evaluate the effects of a dietary fat supplementation on growth, reproduction and performance characteristics of replacement beef heifers reared in different management systems (pasture and dry lot conditions). The objectives were (1) to quantify changes in body composition traits and growth performance of replacement beef heifers fed different levels of fat in the supplemented diet, (2) to determine the reproductive performance of heifers supplemented with dietary fat in either a ryegrass pasture system or a dry lot system, and (3) to determine the value of real-time ultrasound technology (RTU) as an alternative technology to assist producers in the decision making process within replacement beef heifer programs. Over the three year study, we observed that both high (3 - 5%) and low (1.5 - 2.5%)levels of dietary fat supplementation of replacement heifers did not have a negative affect in reproductive performance and body composition traits significantly, compared to controls (pasture-base, no supplementation. However, a positive response with respect to some body composition traits was observed in animals fed the higher level of dietary fat in 2004 and 2005 studies. Overall, growth of animals grazing ryegrass outperformed animals supplemented with dietary fat in a dry lot system; yet when dietary fat supplementation was integrated with a ryegrass pasture system, besides the positive effects in body composition traits metabolic changes in relevant reproduction hormones were observed with the addition of dietary fat treatment. Finally, the use of information on body composition traits of replacement beef heifers through the use of real-time ultrasound technology in the decision-making process resulted in a small financial return in these studies. However, the use of this alternative technology in a replacement beef heifer program may have additional value beyond the limited feeding periods reported here. These may include, a greater ability to predict heifer fertility as linked to growth and developmental characteristics (e.g., body composition traits), yet this requires further study.

Download or read book The Effects of Nutrition on Cattle Reproduction written by Cattle Reproduction Improvement Council and published by . This book was released on 1979 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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 Nutritional and Physiological Factors Influencing Postpartum Reproduction in First Calf Beef Heifers written by Gregory F. Benoit and published by . This book was released on 1985 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: