Heritability and variance components were estimated across a time trajectory defined by hatching week, for body weight of birds recorded at the age of 35 days, in a high hygiene (selection) environment (BWT) and a lower hygiene (commercial) environment (SBWT). There were 53,297 BWT and 10,783 SBWT records. For either trait, heritability and sire variance estimates significantly changed across the trajectory. Heritability estimates for BWT were between 0.11 and 0.47 and for SBWT they ranged from 0.16 to 0.50. The genetic correlation between the two environments was estimated to be 0.34. Broiler breeding programs may benefit from taking into account changes in genetic parameters over time, for more efficient use of resources and faster gain.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume , , 07.05, 2006
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