The construction and use of a selection index combining production, management and conformation traits is described. Relative economic values were estimated Irom multiple regressions of national trading accounts, from a profit function estimating the effects of a cows liveweight on dairy farm income and from the effects of differences in stayability. After liveweight, management traits had the highest economic values of the secondary traits. Our method of estimating economic values allows for a wide range of secondary traits in the index and for intermediate optima or lowest acceptable values to be taken into account.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XIV. Dairy cattle genetics and breeding, adaptation and conservation., , 86–89, 1990
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