Major advances in genetic evaluation techniques

Journal of Dairy Science
R L Powell, H D Norman

Abstract

The past quarter-century in genetic evaluation of dairy cattle has been marked by evolution in methodology and computer capacity, expansion in the array of evaluated traits, and globalization. Animal models replaced sire and sire-maternal grandsire models and, more recently, application of Bayesian theory has become standard. Individual test-day observations have been used more effectively in estimation of lactation yield or directly as input to evaluation models. Computer speed and storage are less limiting in choosing procedures. The increased capabilities have supported evaluation of additional traits that affect the net profitability of dairy cows. The importance of traits other than yield has increased, in a few cases due to an antagonistic relationship with yield. National evaluations combined internationally provide evaluations for bulls from all participating countries on each of the national scales, facilitating choices from among many more bulls. Selection within countries has increased inbreeding and the use of similar genetics across countries reduces the previously available outcross population. Concern about inbreeding has prompted changes in evaluation methodology and mating practices, and has promoted interest i...Continue Reading

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Citations

Sep 19, 2014·Animal : an International Journal of Animal Bioscience·D M McGillJ J Lievaart
Jul 9, 2014·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·William PitchersIan Dworkin
Oct 26, 2012·Journal of Animal Science·W M SnellingA Reverter

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