Relationships between insulin-like growth factor 2 gene polymorphism and growth curve parameters of Nigerian indigenous purebred and crossbred chickens
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Keywords

genotype
IGF-2
growth
chicken
Marshal

How to Cite

Relationships between insulin-like growth factor 2 gene polymorphism and growth curve parameters of Nigerian indigenous purebred and crossbred chickens. (2024). Tropical Agriculture, 101(1), 56-67. https://doi.org/10.37234/

Abstract

This study aimed to investigate the impact of insulin-like growth factor 2 (IGF-2) gene polymorphism on growth curve parameters in Nigerian indigenous purebred and crossbred chickens. The weight of each chick was measured weekly over a period of 20 weeks. Four non-linear growth models (Brody, Gompertz, Logistics, and Von Bertalanffy) were applied to evaluate the relationship between age and body weight. This analysis was conducted using the NLIN procedure of SAS (Version 9.2). A total of 120 blood samples were obtained from 120 chickens at 20 weeks of age for the purpose of DNA extraction, gene amplification, and digestion. The study found that the mean expected heterozygosity values for the Normal feather, Normal feather X Marshal crossbred, Naked neck, Naked neck X Marshal crossbred, Frizzle feather X Marshal crossbred, and Frizzle feather populations were 0.660, 0.592, 0.573, 0.604, 0.541, and 0.488, respectively. The association between IGF-2 genotypic alleles (AA, AB, BB) and growth curve parameters was examined using four growth models. The results indicated a significant association between the genotypic alleles and the growth curve parameters, with the exception of the asymptotic weight and maturing rate in the Gompertz model. The IGF-2 gene shows potential as a valuable selection tool for both purebred and crossbred populations of Marshal and Nigerian indigenous chickens.

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