A comparison of multiple breed genetic evaluations between a combined population of 1,043,153 purebred and crossbred animals with 412,955 purebred only animals was conducted for direct genetic effects of birth weight (BW), direct and maternal effects of weaning gain (WG and MWG) and postweaning gain in the herd (PWG-H) and at central evaluation stations (PWG-S). Differences in breed effects were similar between the combined and purebred population. Correlations between the evaluations from the combined and purebred population were 0.76, 0.74, 0.74, 0.78 and 0.81 for BW, WG, MWG, PWG-H and PWG-S respectively. Approximate expected correlations were 0.76 for all traits. Mean accuracies for each trait were significantly higher for the combined population than the purebred population. Inclusion of crossbred information would allow for multiple breed evaluations to directly compare animals across breed, increase accuracies associated with economically important traits and increase the genetic base to select potential herd sires.

S. L Armstrong, S. P Miller, J. W Wilton, S. Griffiths

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 17. Genetics and breeding of dairy and beef cattle, swine and horses, , 249–252, 1994
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