Download or read book The Accuracy of Various Methods of Recording in Estimating Actual 300 Day Milk Yield in Dairy Cows written by Michael J. Flanagan and published by . This book was released on 1965 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evaluation of Methods for Estimating 305 day Lactation Yield in Dairy Cattle written by Peter Malachi Saama and published by . This book was released on 1995 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Estimation of 305 Day Milk Yield from Irregular Milk Records written by Curtis C. Miller and published by . This book was released on 1966 with total page 212 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 Interval Method to Estimate Lactation Yield written by Oumer Wabe and published by LAP Lambert Academic Publishing. This book was released on 2012 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: To test the accuracy of 30-day TIM with 15 and 45-day TIM of milk recording to estimate the lactation yield and to measure the effect of genetic group, parity and season of calving on the accuracy, 1220 lactation records of Friesian x Arsi cows were utilized. The lactation yield was estimated for lactation length of 210-305 days. The accuracy was measured in terms of absolute difference and percentage difference between actual and estimated yield. The study revealed that 15, 30 and 45-day time interval can estimate lactation yield accurately to extent of less than five percent bias irrespective of genetic group and parity. The season of calving significantly (P 0.05) affected the percentage difference in 15-day TIM. The lactation yield estimated by 15-day TIM was more accurate with high R2 value 99.62%. The regression analysis indicated that actual yield of 9th period in 15-day, 5th period in 30-day and 3rd period in 45-day TIM predicted reliable estimate of 305-day yield. Thus 30 and 45-day time interval methods of recording can be used in estimation of lactation yield in crossbred cows irrespective of season of calving and parity.
Download or read book Cattle Paper written by Beverly Dabney Harris and published by . This book was released on 1916 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effect of Environment on Nutrient Requirements of Domestic Animals written by National Research Council and published by National Academies Press. This book was released on 1981-02-01 with total page 169 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Comparison of Three Mathematical Models for Estimating Lactation Yields from a Few Daily Records written by Pallawarukka and published by . This book was released on 1981 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 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 Index to Theses Accepted for Higher Degrees in the Universities of Great Britain and Ireland written by Aslib and published by . This book was released on 1963 with total page 546 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 Comparison of Two Methods for Estimating Transmitting Abilities of Dairy Cows written by Christa Freda Hanson and published by . This book was released on 1977 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Method of Increasing the Yield of the Milch cow written by and published by . This book was released on 1853 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Precision of Some Sampling Methods of Estimating the Milk Butterfat Solids Not Fat and Crude Protein Yield of Dairy Cows written by Heye Heeren Groenewold and published by . This book was released on 1958 with total page 72 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 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:
