In the estimation of breeding values the performance of ah animal is estimated linearily. The animal gets the more points the higher the performance in the trait is. This kind of evaluation is correct for characteristics as for example daily gain because each extra gain in performance trait produces additional economical profit.

For characteristics of meat quality and stress susceptibility however a linear approach is not valid because these traits have an optimum level. An increase in performance beyond the optimum does not produce additional profit but economical loss.

M Appel, E. Kalm

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 8. Symposia (2), , 558-564, 1982
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