RIB AND VERTEBRAL NUMBERS IN SWINE: II. GENETIC ASPECTS

摘要: Genetic parameters for rib and vertebral number in swine were estimated from data 4,219 pigs produced by 78 sires 359 dams of the Lacombe breed. Regressions offspring on mid-parent were.599 ±.017 and.734 ±.020 corresponding full sib correlations analysis variance were.591 ±.071 and.591 ±.060. The genetic correlation between these two skeletal traits was as.813 ±.022 regression and.792 ±.016 components covariance.Continuous variation both demonstrated. modal phenotype (i.e., 16 pairs ribs 22 vertebrae) progeny more uniform than did parents non-modal phenotypes. Bilateral asymmetry (within-pig variance) also least among "modal" parents.