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Estimation of Genetic Parameters among Breeding Soundness Examination Components and Growth Traits in Yearling Bulls¹

Colorado State University, Fort Collins 80523

Abstract

Data on breeding soundness examinations (BSE) and performance traits were obtained on 549 yearling beef bulls at the San Juan Basin Research Center, Hesperus, Co from 1976 to 1984. Genetic parameters estimated for components of BSE included percent motility (PMOT), percent primary abnormalities (PPRIM), percent secondary abnormalities (PSEC), percent normal sperm (PNOR), scrotal circumference (SC) and BSE score (BSESC). Performance traits included birth weight, weaning weight, yearling weight and average daily gain. The least squares model included birth year, age of dam and breed as fixed effects, sire/breed as a random variable, and age and percent inbreeding as covariates. Paternal half-sib estimates of heritability were PMOT, .08 ± .07; PPRIM, .31 ± .09; PSEC, .02 ± .05; PNOR, .07 ± .06; BSESC, .10 ± .06 and SC, .40 ± .09. Phenotypic correlations among BSE components and growth traits were generally favorable. Genetic correlations involving percent secondary abnormalities were highly variable with large standard errors. Seminal traits improved as age increased and became poorer as inbreeding increased.

¹ Agric. Exp. Sta. res. publ. project no. 28.

² Dept. of Anim. Sci.

³ USDA-ARS, Fort Collins

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