Calving ease (CE) is an economically important reproductive trait, especially for the beef industry. In Canada, herds in the breeding program of Beef Improvement Ontario (BIO) are using rotational and terminal crossbreeding systems. They record both birth weight (BW) and CE. Genetic evaluation of CE is currently performed by transforming the categorical data to Snell scores, adjusting it by heterosis, and applying a linear bivariate model. BIO would like to improve this system by estimating heterosis dynamically and using a bivariate model, assuming a threshold model for CE and a linear model for BW, to improve the accuracy of genetic evaluation of CE. This study used simulation based on parameters from the current evaluation to 1) evaluate the performance of a linear-threshold model in a multibreed population using a Bayesian approach and 2) determine if this linear-threshold model is suitable for estimating direct and maternal heterosis.  

Y. Wang, S. P Miller, Flavio S Schenkel, J. W Wilton, Paul J Boettcher

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 2002. Session 17, , 17.1, 2002
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