Multiple-Trait Prediction of Lactation Yields for Dairy Cows
Open Access
- 1 November 1996
- journal article
- Published by American Dairy Science Association in Journal of Dairy Science
- Vol. 79 (11), 2044-2055
- https://doi.org/10.3168/jds.s0022-0302(96)76578-5
Abstract
A multiple-trait procedure is described for predicting 305-d lactation yields for milk, fat, and protein that incorporates information about standard lactation curves and covariances between yields for milk, fat, and protein. Test day yields are weighted by their relative variances, and standard lactation curves of cows from similar breed, region, lactation number, age, and season of calving are used for the estimation of lactation curve parameters for each cow. Accuracies of the test interval method and the multiple-trait procedure were comparable. In addition, the multiple-trait procedure can handle long intervals between test days as well as test days with milk only recorded and can make 305-d predictions on the basis of just one test day record per cow. The procedure also lends itself to the calculation of peak yield, day of peak yield, yield persistency, and expected test-day yields, which could be useful management tools for a producer on a milk recording program.Keywords
This publication has 12 references indexed in Scilit:
- Use of test day yields for genetic evaluation of dairy sires and cowsLivestock Production Science, 1993
- ACCOUNTING FOR COVARIANCES AMONG TEST DAY MILK YIELDS IN DAIRY COWSCanadian Journal of Animal Science, 1987
- Comparison of different methods of predicting 305-day milk yield using means calculated from within-herd lactation curvesLivestock Production Science, 1987
- On fitting curves to lactation dataAnimal Science, 1978
- Nonlinear Techniques for Predicting 305-Day Lactation Production of Holsteins and JerseysJournal of Dairy Science, 1977
- Estimating Holstein Lactation Curves with a Gamma CurveJournal of Dairy Science, 1977
- ESTIMATING THE SHAPE OF THE LACTATION CURVECanadian Journal of Animal Science, 1976
- Accuracy of Test Interval Method of Calculating Dairy Herd Improvement Association RecordsJournal of Dairy Science, 1968
- Test Interval Method of Calculating Dairy Herd Improvement Association RecordsJournal of Dairy Science, 1968
- Algebraic Model of the Lactation Curve in CattleNature, 1967