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Journal of Dairy Science Vol. 66 No. 6 1370-1376
© 1983 by American Dairy Science Association ®
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Variances of Prediction Errors for Differences of Estimated Genetic Values of Cows in the Same and in Different Herds

D. C. Bolgiano1, R. L. Quaas and L. D. van Vleck

Department of Animal Science, Cornell University, Ithaca, NY 14853

ABSTRACT

A modification of the evaluation method for cows in the northeast United States allowed simultaneous evaluation of cows in pairs of herds and computation of variances of prediction errors of differences of genetic potential between pairs of cows within and across herds. These variances were examined for 20 pairs of herds in Holstein, Jersey, and Brown Swiss breeds. Current evaluations of cows are nearly as accurate for comparing cows from different herds as they are for comparing cows from the same herd.

FOOTNOTES

1 Department of Biostatistics, University of Washington, Seattle 98195.






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