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 Maintaining Optimum Reproductive Efficiency in Georgia Dairy Herds written by J. N. Maddux and published by . This book was released on 1975 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Optimum Reproductive Efficiency in Dairy Herds written by J. N. Maddux and published by . This book was released on 1982 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Optimum Reproductive Efficiency in Dairy Herds written by Rick Hardin and published by . This book was released on 1986 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Experiments in Breeding Holstein Friesian Cattle for Milk and Butterfat producing Ability and an Analysis of the Foundation Cows and of the First Out bred Generation written by Milton Henry Fohrman and published by . This book was released on 1939 with total page 90 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 Improved Reproductive Efficiency in Dairy Herds Through an Understanding of Management Problems and Conception Failure written by Paul Lee Craven and published by . This book was released on 1974 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Factors Affecting Calf Crop written by Michael J. Fields and published by CRC Press. This book was released on 2021-11-18 with total page 385 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 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 Attempts to Increase the Reproductive Efficiency of Dairy Heifers and Lactating Dairy Cows written by Carrie Renee Johnson and published by . This book was released on 2012 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Reproductive Efficiency of Dairy Cows in West Virginia written by Dale Alan Coleman and published by . This book was released on 1983 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Relationship Between Production Level and Reproductive Efficiency in Dairy Cattle written by Charles R. Mosley and published by . This book was released on 1971 with total page 35 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Reproductive Efficiency in Dairy Cattle written by University of Missouri. Agricultural Experiment Station and published by . This book was released on 1953 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book An Analysis of the Factors Affecting the Reproductive Performance written by Herbert Ray Williams and published by . This book was released on 1976 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Measuring and Improving Reproductive Efficiency of Dairy Herds in the Lower Latitudes written by H. B. Perdok and published by . This book was released on 1978 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Evaluation of Reproductive Efficiency in Lactating Dairy Cows Through Physiologic Evaluation and Synchronization Modification written by Charles Dexter Young and published by . This book was released on 2015 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reproductive performance of lactating dairy cows has decreased as milk production has increased as a result of genetic selection. Milk production alone is not the reason for decreased reproductive performance, as fertility issues are multifactorial and collaborative. Research chapters contained within have taken an applied approach focusing in two different areas of fertility. One approach was development of an evaluation system to identify lactating cows with decreased fertility prior to breeding; while another approach was to modify an ovulation synchronization protocol during periods of heat stress in order to improve fertility. The first focus was development and evaluation of a size and position score based on a one to three scale and assigned to lactating cows during a pre-breeding exam. This score was a reflection of the cervical and uterine horn diameter, and of the position of the reproductive tract in relation to the pelvis. Results indicated that cows with the largest reproductive tracts (score 3) had a 15% decrease in conception rates following artificial insemination compared to the smallest reproductive tracts (score 1). Score two reproductive tracts (intermediate) exhibited decreased conception rates compared to score one, but greater than score three. Identification of cows with lower potential fertility will allow producers to make the most economically, efficient decision when artificially inseminating lactating dairy cows. The second research focus modified an ovulation synchronization protocol by including an intravaginal progesterone releasing device (CIDR) nine days prior to artificial insemination during periods of heat stress. Use of a CIDR has shown to be beneficial with modest improvements in fertility in cool seasons, especially in anovular cows. This modification did not prove to be beneficial in improving conception rates during periods of heat stress. Lactating dairy cows with or without a progesterone releasing device had comparable conception rates. This research remains informative since use of a CIDR is expensive. This research exhibits this additional expense does not lead to positive results, thereby discouraging producers from incurring an unnecessary expense.

Download or read book A Study of the Effect of Veterinary Therapy on the Reproductive Efficiency of Dairy Cows with Abnormal Postpartum Uteri and the Genetic Merit of Artificially Sired Herdmates as Compared with Naturally Sired Daughters in the Same Herd written by Devegowda Gopal and published by . This book was released on 1977 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt: