Calculation of EPD's from crossbreeding programs may be biased if heterogeneity of variance exists and is not accounted for. Records of weaning and yearling weights of Fj calves sired by bulls of 22 breeds evaluated in a top cross experiment were used to investigate the nature of heterogeneity of variance caused by sex and sire breed cm these traits. Variances were different (P<.02) in scale but not as fractions of the phenotypic variance (P>.10) according to sex and sire breed subclasses. Adjustments for differences in scale of phenotypic variances are recommended.

F. A Rodriguez-Almeida, L. D van Vleck, L. V Cundiff

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 17. Genetics and breeding of dairy and beef cattle, swine and horses, , 202–205, 1994
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