Abstract

Maximal genetic and clonal responses were determined by varying the mating design (number of full sibs and clones) for a given test capacity of 1024 places. Responses were corrected for the influence of population size and structure, and for selection disequilibrium. Reductions in clonal and genetic responses due to these factors varied from 4-27% and from 24-32% respectively, and were largest when 4 instead of 32 sires were selected per generation and the intra-clone correlation was low. Optimal schemes for clonal response changed as a result of this correction, while schemes optimal for genetic selection were unaffected. Testing schemes optimal for clonal and genetic response were different, which creates a problem in combining the two types of selection. A reduction in intensity of clonal selection reduced clonal responses and changed optimal testing schemes.
 

I. JM de Boer, Johan AM van Arendonk

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XIV. Dairy cattle genetics and breeding, adaptation and conservation., , 267–270, 1990
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