ArticleJournal of animal breeding and genetics = Zeitschrift fur Tierzuchtung und Zuchtungsbiologie2026
Phenotypic Responses to Selection in Ross 308 Broiler Breeders: Long-Term Growth Assessed With Nonlinear Models Across Four Generations.
Article in Journal of animal breeding and genetics = Zeitschrift fur Tierzuchtung und Zuchtungsbiologie, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Phenotypic responses to selection in growth performance of Ross 308 broiler breeders were evaluated using longitudinal body weight records from hatch to 64 weeks across four successive generations (G1-G4). The effects of generation, sex, and their interaction on body weight were examined, and sex-specific growth trajectories were modelled using eight nonlinear growth functions (Gompertz, Richards, Logistic, Brody, von Bertalanffy, Weibull, Hossfeld, and López). Generation and sex exerted highly significant effects on body weight across most ages (p ≤ 0.0001), with males consistently heavier than females and sexual dimorphism becoming evident after 4 weeks of age. At 60 weeks, fourth-generation birds exhibited higher body weights than first-generation birds (males: 5036.5 vs. 4744.3 g; females: 4152.2 vs. 3858.3 g), indicating progressive phenotypic improvement across generations. A significant generation × sex interaction (p ≤ 0.05) indicated that the magnitude of sexual dimorphism varied among generations. Model performance was evaluated using the coefficient of determination (R
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