The rate of genetic progress in selecting for a character with female phenotypes only was studied using two single-locus deterministic models and one simulation model with 32 loci (two alleles with initial frequencies of 0.5 at each locus). There was random mating in all generations or random mating and full-sib mating in alternate generations among the selected individuals. For deterministic models the saving of time due to inbreeding in reaching a given proportion of the maximum response (50, 75 and 90 %) was about 20-40 %, increasing with the degree of dominance and with the proportion of the maximum response. For simulation the corresponding saving of time was about 10-20 %. It was concluded that the models generally exaggerate the advantage from the inbreeding method in real populations, the success depending decisively on the genetic composition of the base population.

S. Sirkkomaa

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XII. Biotechnology, selection experiments, parameter estimation, design of breeding systems, management of genetic resources., , 297–302, 1986
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