A bivariate threshold sire and maternal grand sire model was used to study genetic variation of calving ease (CE) and stillbirth (SB) data from in Holsteins. Bayesian approach with Gibbs sampler was implemented to estimate fixed and random effects and (co)variance components. Both direct and maternal heritabilities were found to be significant for CE and SB however, the genetic correlations between direct and maternal effects were not important for CE and SB. The existence of significant positive and moderately high direct and maternal genetic correlations between CE and SB indicate that a complicated calving may result in stillbirth in dairy cattle.

Y. Gevrekci, Y. M Chang, K. Kizilkaya, Daniel Gianola, K. A Weigel, Y. Akbas

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume , , 01.26, 2006
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