Genetic and phenotypic relationships between physiological traits and performance test traits in sheep

ND Cameron, E. Cienfuegos-Rivas
1994 Genetics Selection Evolution  
Genetic and phenotypic relationships between physiological traits and performance test traits were estimated with data from lines of Texel-Oxford sheep divergently selected for carcass lean content, for the identification of physiological predictors of genetic merit for carcass lean content. At the end of the performance test, blood samples were taken from 151 animals, the progeny of 31 sires, when fed and when fasted for 30 and 54 h. Heritability estimates for traits associated with protein
more » ... ted with protein metabolism, creatinine, urea and insulin-like growth factor-1 (IGF-1), were higher with ad-libitu!n feeding than heritabilities of traits associated with lipid and energy metabolism, β-hydroxybutyrate, non-esterified fatty acids, triglyceride and glucose. Several physiological traits, !3-hydroxybutyrate, creatinine and insulin-like growth factor-1 (IGF-1), were moderately correlated with the performance test traits of liveweight and muscle depth, but only urea and insulin-like growth factor-1 were significantly correlated with backfat depth. Correlations between physiolog-
doi:10.1051/gse:19940204 fatcat:3rvn56jhffgdtmsbfzho7z52zi