Download or read book The Relative Accuracy of Estimating the Production of Dairy Cows as Affected by Length of Testing Interval and Method of Estimating Production written by Ross M. Young and published by . This book was released on 1964 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt: Production records for dairy cows were first based on the yield of butter for a seven day period any time during the lactation. Later, 365- day records based on production for one day in each calendar month came into general use. The records preferred at present are 305- day records based on monthly test day production, but calculated using the centering date method. The centering date estimate is based on milk and butterfat production from two consecutive milkings per month. The sampling day is centered as nearly as possible in the test month period which need not coincide with the calendar month. The reason for the general acceptance of the 305- day records is the desire of the dairyman to freshen the dairy cow annually, which means milking for ten months and dry for two months. Records calculated by the centering date method more nearly represent actual production than records calculated by other methods that have been used. It is generally accepted that if the present testing program is used properly it can be of great value to the dairy farmer from the standpoint of herd improvement and for selecting animals for a breeding program. However, only a small percentage of the dairymen take advantage of a testing program. One of the limiting factors has been the cost of testing and record keeping. It has been suggested that bimonthly or trimonthly test periods might provide as much information as the monthly testing interval and at the same time reduce the cost to the individual dairymen. It is reasonable to speculate that with reduced costs there would be an increased number of herds tested. This would help compensate the testing supervisor and data processing center for lost income resulting from less frequent testing, and at the same time provide more information for national sire proving programs. However, bimonthly or trimonthly testing has not been accepted because of the possibility of larger error being involved in individual records. This larger error occurs because the curvelinear shape of the lactation is not taken into account and a cow is given credit for the same production over the entire testing period, resulting in either under or over estimation of the record. The objective of this study is to measure the relative accuracy of estimating 305- day production of dairy cows by using different testing intervals and different methods to estimate production. Monthly, bimonthly, and trimonthly intervals are studied. Methods include the centering date method and three methods using factors designed to extend production from each test day to a 305-day estimate with the test day estimate averaged to determine the final estimate of production for 305 days.
Download or read book A Comparison of Three Systems of Testing for Estimating Lactation Yield written by Pallawarukka and published by . This book was released on 1977 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Indian Journal of Dairy Science written by and published by . This book was released on 1997 with total page 462 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Evaluation of Alternate Monthly Testing Procedures to Estimate Production Traits written by Paulo Ebling Rodrigues and published by . This book was released on 1973 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Estimating Profitability of Dairy Cows written by Samuel Brody and published by . This book was released on 1936 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Review for written by Institouto Geōrgikōn Ereunōn (Cyprus) and published by . This book was released on 1995 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Farmers Guide written by and published by . This book was released on 1907 with total page 1116 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Lactation Genomics and Phenomics in Farm Animals Where are we at written by Xiao-Lin Wu and published by Frontiers Media SA. This book was released on 2023-05-12 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Study of Methods for Estimating Milk Production in Range Beef Cows and Factors Associated with the Milk Production Estimate written by Kern S. Hendrix and published by . This book was released on 1971 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Milk Revised Estimates 1965 69 written by and published by . This book was released on 1973 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Agricultural Economics Report written by and published by . This book was released on 1959 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effect of Equal and Unequal Sampling Intervals on Accuracy of Estimating Total Lactation Yield written by Saloma-Lee Mildred Anderson and published by . This book was released on 1987 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Feed Efficiency in the Beef Industry written by Rodney A. Hill and published by John Wiley & Sons. This book was released on 2012-06-18 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt: Feed Efficiency in the Beef Industry provides a thorough and concise overview of feed efficiency in beef cattle. It frames the great importance of feed efficiency to the industry and details the latest findings of the many scientific disciplines that intersect and aim to improve efficient and sustainable production of nutritious beef. The vast majority of production costs are directly tied to feed. With increased demand for grains to feed a rapidly increasing world population and to supply a new demand for alternative fuels, feed costs continue to increase. In recent years, the negative environmental impacts of inefficient feeding have also been realized; as such feed efficiency is an important factor in both economic viability and environmental sustainability of cattle production. Feed Efficiency in the Beef Industry covers a broad range of topics ranging from economic evaluation of feed efficiency to the physiological and genetic bases of efficient conversion of feed to high quality beef. Chapters also look at how a fuller understanding of feed efficiency is leading to new selective breeding efforts to develop more efficient cattle. With wide-ranging coverage from leading international researchers, Feed Efficiency will be a valuable resource for producers who wish to understand the complexities, challenges, and opportunities to reduce their cost of production, for students studying the topic and for researchers and professionals working in the beef industry.
Download or read book Irish Journal of Agricultural Research written by and published by . This book was released on 1988 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Production of Dairy Cows as Affected by Frequency and Regularity of Milking and Feeding written by Thompson Elwyn Woodward and published by . This book was released on 1931 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cumulated Index Medicus written by and published by . This book was released on 2000 with total page 1808 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Relation of Production to Income from Dairy Cows written by John Chambers McDowell and published by . This book was released on 1922 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: And conclusions. pp. 20.
