Sire breeding values for the interval between first and last insemination were predicted using four Proportional Hazard models (survival analysis) and two linear mixed models to study which results in a more accurate genetic evaluation. A stochastic simulation describing the reproductive cycle of first parity cows was done, in which true breeding values for conception rate were created. The model included the effects of sire and herd. Correlations between true breeding values for conception rate and breeding values for the interval between first and last insemination predicted with the best survival analysis model or the best linear model were 0.794 and 0.744, respectively. The results showed that when pregnancy status is known, survival models are better than linear models for genetic evaluation of conception rate when using observations on the interval between first and last insemination.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume , , 24.28, 2006
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