Download or read book The Association of Persistency of Lactation and Reproductive Efficiency in Dairy Cattle written by Harold Charles Hines and published by . This book was released on 1961 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Inheritance of Persistency in Lactation in Dairy Cattle written by Thomas Murrell Ludwick and published by . This book was released on 1942 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Farm Animal Metabolism and Nutrition written by J. P. Felix D'Mello and published by CABI. This book was released on 2000 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents specially commissioned reviews of key topics in farm animal metabolism and nutrition, such as repartitioning agents, near infrared reflectance spectroscopy and digestibility and metabolisable energy assays, where major advances have recently been made or which continue to represent issues of significance for students and researchers. Authors include leading researchers from Europe, North America and Australia.
Download or read book Persistency of Lactation in Dairy Cows written by Albert Lemuel Whiting and published by . This book was released on 1927 with total page 608 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Associations of Pre and Post partum Lying Time with Metabolic Status Health Survival and Performance of Dairy Cows written by Juan M. Piñeiro and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Dairy cattle have strong behavioral need to rest and deprivation of their lying time (LT) has been associated with lameness and changes in feeding behavior and endocrinological milieu. However, the effects of LT during the transition period on metabolic stress, inflammation, health and performance have not yet been fully investigated. Therefore, the following tree specific aims were conducted. A total of 1052 Holstein cattle (401 nulliparous heifers and 651 parous cows) from 3 commercial dairy farms were enrolled for this prospective cohort study. The first aim (Chapter 3) was to evaluate the association of pre- and postpartum lying time (LT) on calcium and energy balance (NEFA and BHB), inflammation (haptoglobin and hemogram), and health status of dairy cows. Prepartum LT had significant quadratic association on serum NEFA concentration, but was not significantly associated with serum Ca concentration within 48 h after calving. Increased LT within 14 DIM was associated with increased risk of diagnosis with ketosis within 14 DIM, inflammation, and incidence of postpartum diseases. Findings from this study suggest that LT along with Ca and energy balance are critical for transition cow health. The second aim (Chapter 4) was to assess the association of post-partum LT on milk yield, components (milk fat and protein percentage), and somatic cell count (SCC). Milk yield at first DHIA test was not associated with LT within the first 14 DIM, but was negatively correlated with the daily coefficient of variation (CV) of LT within 14 DIM. However, health status was associated with milk yield and components, and health status was associated with LT within 14 DIM. The third aim (Chapter 5) was to evaluate the association of lying time (LT) within the first 14 days in milk (DIM) and health status on culling within 60 DIM, cyclicity, and reproductive performance. LT had a positive linear association with culling, for every hour increment of LT within 14 DIM the culling risk within 60 DIM increased by 1 percentage point, and negative quadratic association with cyclicity at 42 DIM. Multiparous cows with a LT of 9-13 h/d had greater probability of pregnancy up to 300 DIM compared to cows with a LT >13 h/d. These findings suggest that there is an optimum daily LT range for early postpartum cows housed in freestall barns, different than reported for mid lactation cows, with the potential for improved reproductive performance.
Download or read book Feed Efficiency Dynamics in Relation to Lactation and Methane Emissions in Dairy Cattle written by David John Seymour and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: With continued global population growth, there is a need to develop more efficient, environmentally friendly food production to meet increasing nutritional demands. Dairy production provides an opportunity to address these nutritional needs by generating a high-quality protein, fat and energy source (milk) from plant matter that is indigestible by humans. However, low feed efficiency and greenhouse gas production are challenges that need to be addressed. The objectives of this thesis were to 1) critically review methods of determining feed intake in dairy cattle, 2) develop and evaluate different measures of feed efficiency, and examine the associations of feed efficiency with aspects of 3) the lactation curve and 4) methane emissions, with the end goal of the downstream incorporation of these traits into the Canadian dairy cattle breeding program. All experimental analyses were conducted on data collected from a sample of 40 primiparous Holstein heifers over the first 150 days of lactation. It was found that feed efficiency fluctuates on a daily basis regardless of measure used, though different measures generally followed the same trends of increasing or decreasing efficiency. Persistency of lactation was found to be positively associated with increased feed efficiency and decreased methane production and intensity. No significant associations were observed between feed efficiency and methane production, though feed efficiency was associated with lower methane intensity. These collective findings suggest feed efficiency and methane emissions can be improved by selecting for dairy cattle that are smaller and have increased persistency of lactation. Efficiency and methane emissions can be further improved by improved management of body condition score and by extending lactations beyond the conventional 305-day length. Future work should focus on reformulating the equations used in net energy models to reflect the genetic progress made in cattle over recent decades, as well as longitudinal studies to characterize the lifetime efficiency of dairy cattle.
Download or read book Factors Affecting Reproductive Efficiency in Dairy Cattle written by Durward Olds and published by . This book was released on 1954 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Persistency of Lactation in Dairy Cows written by W. L. Gaines and published by Forgotten Books. This book was released on 2017-11-23 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Persistency of Lactation in Dairy Cows: A Preliminary Study of Certain Guernsey and Holstein Records The term persistency of lactation is used to refer to the degree with which the rate of milk secretion is maintained as lactation advances. Cows ordinarily reach their highest rate of milk secretion in any one lactation period, shortly after calving. Following the flush of lactation, the rate of milk secretion declines more or less rapidly until the cow goes dry naturally or is dried up artificially by discontinuing milking. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Download or read book Relationship Between Milk Yield and Post partum Reproductive Performance in Holstein Dairy Cows written by Humphrey Hamudikuwanda and published by . This book was released on 1985 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Relationship between breeding efficiency calving interval and milk written by Charles George Morgan Edgerly and published by . This book was released on 1950 with total page 238 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 296 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Feeding Dairy Cows in the Tropics written by Andrew Speedy and published by Daya Books. This book was released on 1998 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book review the various milk production system according to agro-climate and technical, economical and sociological conditions, review new knowledge in ruminant digestion nutrition and physiology, match milk production systematic available and potential feed resources, taking into account their nutritional characteristics. The book make recommendations for the development of sustainable milk production systems based on locally available feed resources. Contents Chapter 1: Medium Terms Outlook for Dairying in the Developing Countries by W Krostitz, Chapter 2: The Lactating Cow in the Various Ecosystems: Environmental Effects on Its Productvity by H D Johnson, Chapter 3: Physiological Constraints to Milk Production: Factors which Determine Nutrient Partitioning, Lactation Persistency and Mobilization of Body Reserves by Y Chillard, Chapter 4: Influence of Nutrition on Reproductive Performance of the Milking/Gestating Cow in the Tropics by K H Lotthamer, Chapter 5: The Role and Mechanisms of Genetic Improvement in Production Systems Constrained by Nutritional and Environmental Factors by O Syrstad, Chapter 6: Matching Livestock Systems with Available Resources by T R Preston, Chapter 7: Nutritional Characteristics of Tropical Feed Resources: Natural and Improved Grasslands, Crop Residues and Agro Industrial by Products by M Chenost and R Sansoucy, Chapter 8: Feeding Strategies for Improving Milk Production of Dairy Animals Managed by Small Farmers in the Tropics by R A Leng, Chapter 9: Feeding Riverine Buffaloes for Milk/Dual Purpose Production by A M El Serafy, Chapter 10: Feeding Swamp Buffalo for Milk Production by S Khajarern and J M Khajarern, Chapter 11: Future Prospects for Fodder and Pasture Production by A Aminah and C P Chen, Chapter 12: Forage and Legumes as Proteing Supplements for Pasture Based Systems by F A Moog, Chapter 13: The Development of Dairy Farming in Thailand by S Pichet, Chapter 14: Milk Production Systems Based on Pasture in the Tropics by Roberto Garcia Trujillo, Chapter 15: Dairy Production in the Semi Arid Rangelands of West Africa by Modibo Traore, Chapter 16: Feeding Systems and Problems in he Indo Ganges Plain: Case Study by V C Badve, Chapter 17: Feeding Dairy Cattle in Tropical Region of China by Cheng Naging, Chapter 18: Milk Production Systems in Tropical Latin America by J I Restrepo, E Murgueitio and T R Preston, Chapter 19: Restricted Suckling in Dual Purpose Systems, Chapter 20: Heifer Rearing in the Tropics by J Ugarte, Chapter 21: Feeding Cows for Milk Production in the Arusha/Kilimanjaro Coffee/Banana Belt of Tanzania FAO Project: Assistance to Smallholders in Dairy Development: Case Study by L S Morungu, Chapter 22: Milk Production From Tropical Fodder and Sugarcane Residues Case Study: on Farm Research in Mauritius by A A Boodoo, Chapter 23: Training in the Development of Feed Resources by R W Froemert.
Download or read book The Testing of Cows written by Joseph Lawrence Hills and published by . This book was released on 1907 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Persistency of Lactation in Dairy Cows A Preliminary Study of Certain Guernsey and Holstein Records written by W. L. Gaines and published by Sagwan Press. This book was released on 2018-02-08 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.
Download or read book The Association of Level of Milk Production with Reproductive Performance in Canadian Dairy Cattle written by University of Guelph. Dept. of Population Medicine and published by . This book was released on 2009 with total page 90 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 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:
