Four litters produced by father-daughter matings (back crosses) resulting in animals with an inbreeding coefficient of 25 percent were typed with 21 informative genetic markers with respect to identical homozygosity. On the basis of these markers the realized inbreeding was found to vary between 6 and 42 %. The linear decrease in weight at day 1,26, 88 and 136 regressed on relative degree of identical homozygosity was estimated to -.71, -4.8, -10 and -31 kg respectively. Correspondingly a decrease in daily gain of 182 g and an increase of 2.3 percent of lean was found. Calculations show that the effect of each locus with identical homozygosity was generally small and in most cases the effect was, as expected, negative on growth.

K. Christensen, M. Fredholm, A. K Wintero, S. Andersen

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 19. Selection and quantitative genetics; growth; reproduction; lactation; fish; fiber; meat., , 155–158, 1994
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