Data from 2032 Angus cows were analyzed with threshold-liability sire models under a Bayesian setting, to assess genetic variability in calving success (CS), defined as a different binary trait for each of the second (CS2), third (CS3) and fourth (CS4) calving opportunity. Sire (herd) variances ranged from 0.08 to 0.10 (from 0.10 to 0.20) and heritabilities from 0.27 to 0.35, with large credibility intervals. Herd correlations between CS at different calving opportunities were positive. Genetic correlation between CS2 and CS4 was positive (0.68), whereas those involving adjacent calving opportunities (CS2-CS3 and CS3-CS4) were negative, -0.39 and -0.54, respectively. The residual correlation between CS2-CS3 was negative (-0.32). CS is moderately heritable. The quality of data recording should be improved.

Jorge I Urioste, Y. M Chang, Daniel Gianola

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume , , 03.12, 2006
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