Presence of genotype by environment interaction has been investigated in a traditional french layer chicken, the "Gauloise Doree". In this genotype, reproducers are chosen in a controlled environment, in which animals are submitted to a classical photoperiod program used for layers. At the opposite, their offspring are reared outside and submitted to natural variation of day length. We thus compared performances of 90 hens issued from 9 sires places either under classical light program (C) or under a light program simulating a birth in spring (S). Laying curves were very different in both environment, and performances much better in C than in S (70.4 vs 42.6 eggs laid until 52 weeks). Interaction between sire and treatment were significant on egg length, yolk redness and defective eggs percentage. Moreover, sires ranked very differently in both environments, i.e. males susceptible to be chosen as reproducers are very different in C and S. For some traits such as mean length of series or egg colour (L), the correlation of sires ranks in C and S is negative, i.e. males with the best value in C are those with the worse value in S.

A. L N'Dri, S. Mignon-Grasteau, N. Sellier, C. Beaumont, D. Gourichon, M. Tixier-Boichard

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume , , 07.15, 2006
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