It is possible to describe a realized selection by means of an indicator, f(x): probability for an individual of value x to be selected. Various models for this indicator are proposed, in the univariate case, and on the assumption that individuals are ranked on a linear index of measured variables.E stimators are defined on the basis of these models for rating traits controlled during selection. A numeric example with ewes is given.

Jean-Michel Elsen, Loys Bodin, G. Ricordeau

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume IX. Breeding programs for dairy and beef cattle, water buffalo, sheep, and goats., , 671–677, 1986
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