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Prediction of transmitting abilities for Holstein type traits.
P M Vanraden1, E L Jensen, T J Lawlor
1Department of Dairy Science, University of Wisconsin, Madison 53706.
Journal of Dairy Science
|January 1, 1990
Summary
Estimating heritabilities and correlations for Holstein dairy cows revealed significant genetic variation in linear type traits. Adjusting for mate merit improved genetic trend evaluations, enhancing accuracy for breeding decisions.
Area of Science:
- Animal Breeding and Genetics
- Quantitative Genetics
- Dairy Cattle Evaluation
Background:
- Linear type traits are crucial for dairy cattle breeding programs.
- Accurate estimation of genetic parameters is essential for effective selection.
Purpose of the Study:
- To estimate heritabilities and genetic/phenotypic correlations for 14 linear type traits in Holstein cattle.
- To evaluate the impact of adjusting for mate merit on sire evaluations and genetic trends.
Main Methods:
- Utilized multiple trait REML (Restricted Maximum Likelihood) on a large dataset (779,391 daughters, 871 sires).
- Analyzed records closest to 30 months of age for individual appraisal.
- Compared sire models with and without adjustment for mate merit.
Main Results:
- Heritability estimates ranged from 0.10 (foot angle) to 0.37 (stature).
- Correlated traits significantly improved prediction reliability (up to 60% for foot angle).
- Adjustment for mate merit slightly decreased final score heritability but increased estimated genetic trend.
Conclusions:
- Genetic parameters for linear type traits provide valuable information for Holstein breeding.
- Adjusting for mate merit refines sire evaluations and genetic trend estimation.
- Implemented models enhance the accuracy of genetic evaluations for linear traits and final score.