Trait association of genetic markers in the growth hormone and the growth hormone receptor gene in a White Leghorn strain

Poultry Science
X P FengD Zadworny

Abstract

Alleles of the growth hormone (GH) gene and GH receptor (GHR) gene were analyzed for association with juvenile body weight (HBWT), age at first egg (AFE), the hen-day rate of egg production (HDR), egg specific gravity (SPG), and egg weight (EWT) in a strain of White Leghorns. The particular strain segregated at near equal frequencies for two GH alleles defined by differences at three restriction fragment length polymorphisms (RFLP) and for two GHR alleles defined by a single RFLP. The GH genotype was significantly associated with AFE (P < or = 0.04) as well as HDR from 274 to 385 d (P < or = 0.04) and 386 to 497 d (P < or = 0.0003). The GHR genotype (haploid in female chickens) had trends for association with HBW (P < or = 0.06) and HDR from AFE to 273 d (P < or = 0.07). The effects on the egg quality traits SPG and EWT were not significant. Regression analysis revealed that HDR was associated negatively with AFE and positively with HBWT. The slope of the regression line of HDR on AFE varied with the GH genotype, with the effect that the differences in HDR between GH genotypes was relatively small in chickens with early AFE and large in chickens with late AFE. Similarly, the slope of the regression of HDR on HBWT varied between...Continue Reading

Citations

Oct 26, 2011·Reproduction in Domestic Animals = Zuchthygiene·Mu-Tzu ChangMu-Chiou Huang
Apr 21, 2020·British Poultry Science·Yanli DuChangrong Ge
Jan 29, 2014·Molecular Biology Reports·Fang ChenChunMei Li
Apr 13, 2018·Asian-Australasian Journal of Animal Sciences·Peishi FengLin Yang
Oct 27, 2004·General and Comparative Endocrinology·S HarveyC Aramburo

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