Two different approaches: a character state model (CSM), and a reaction norm model (RNM) were tested in Cuban Zebu sires Offspringxs weight records. CSM considered the final weight in 2 environmental groups as different traits, and Spearman correlation between breeding values in both environments were tested. RNM considered a sire model with contemporary group as a fixed effect and the random regression of sire into the contemporary group averages standardized as environmental describer. Heritability's estimates varied all over the environment gradient in different ways depending on the model, and the order of fit of Legendre Polynomial. The highest heritability estimates were obtained by RNM18L3 model (h2=0.26±0.04) and genotype-environmental interaction (GEI) was significant for CSM and RNM3, since for all other analyzes, rg was close to 1. These results suggest the subjectivity of detection of GEI depending on the definition of environmental describer
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume Genetic Improvement Programs: Selection for harsh environments and management of animal genetic resources (Posters), , 422, 2014
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