Results from the first two generations of a selection experiment on income minus feed cost (ICMF) between 21 and 40 weeks of age are presented. The experiment consists of two identically selected lines and a random bred control line, each of 20 male and 80 female breeders. Mass selection on the female side and no selection on the male side is performed. A selection intensity of around 18 % can be observed. Averaged over the two lines, ICMF was 3.2 % resp. 6.9 % above the control for the first and the second selected generation. A realized heritability of .15 was found for ICMF. Feed efficiency was slightly improved by 1.5 % and 2.8 % respectively. After two generations, average correlated responses of 1.7 g in egg weight, 197 g in egg mass, -23 g in body weight and 38 g in feed consumption occured and no change in age at first egg and number of eggs were found. Genetic correlations between ICMF and other traits are given.

C. Hagger, C. Marguerat

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume X. Breeding programs for swine, poultry, and fish., , 299–303, 1986
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