Experiences with a genetic evaluation using test day data
作者： L Dopp , F Reinhardt , R Reents
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摘要: A multiple lactation test day model was applied to predict genetic merit for dairy production traits in German Holstein cattle. The evaluation included a fixed herd-test-date effect, regressions on functions of days milk, random permanent environmental effects within lactation, animal effects, and residual effects. Test evaluations cows were compared obtained with as used official Germany. Correlations between EBV from test-day range .87 .92 older complete information, but low .83 .85 young few records. Adjustment heterogeneous variances across herds is one the most important next steps apply routine ___________________________________________________________________________________
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