What question did this study set out to answer?

To assess long-term growth responses in Ross 308 broiler breeders across four generations using nonlinear models.

May 7, 2026Journal of Animal Breeding and Genetics0 citations

Phenotypic Responses to Selection in Ross 308 Broiler Breeders: Long‐Term Growth Assessed With Nonlinear Models Across Four Generations

LALajan Salahaldin AhmedUniversity of Anbar HAHaval Ismail AzizSalahaddin University-Erbil

Key Points

To assess long-term growth responses in Ross 308 broiler breeders across four generations using nonlinear models.
Utilized the Gompertz model and Richards model for growth trajectory assessment
Measured sex- and generation-specific growth variation
Analyzed inflection point weights for male and female breeders
Predicted growth values closely aligned with observed data
Significant phenotypic improvement in growth traits over generations
The Gompertz model effectively describes growth dynamics in broiler breeders

Abstract

= 0.9974-0.999; MSE = 1521.5-1988.5; RMSE = 39.03-44.59), while the Richards model effectively captured sex- and generation-specific variation in growth trajectories. Inflection point weights ranged from 1819.5 to 2012.5 g in males and from 1433.7 to 1573.4 g in females. Predicted values were closely aligned with observed data across models, indicating good descriptive performance of the fitted functions. These findings highlight consistent phenotypic improvement in growth traits across generations and demonstrate that the Gompertz model provides a practical and robust framework for describing and monitoring growth dynamics in broiler breeder populations, supporting its use in selection and management decisions.

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