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Journal of Dairy Science Vol. 73 No. 12 3586-3590
© 1990 by American Dairy Science Association ®
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Relationships of Calving Ease with Type Traits

R. I. Cue 1, H. G. Monardes 1, and J. F. Hayes 1

1 Department of Animal Science, Macdonald College of McGill University, Ste Anne de Bellevue, PQ H9X 1C0, Canada

Type information collected by the Holstein Association of Canada was combined with calving ease data from the Quebec Dairy Herd Analysis Service. Type traits considered were overall score, general appearance, dairy character, capacity, rump, rump thurl width, rump pin setting, and set of rear legs. calving ease was considered as a direct effect and as a maternal effect in both heifers and adult cows. After editing the were 24,618 type records, 47,023 direct effect calving ease records, and 37,068 maternal effect calving ease records from 107 sires in the analyses of heifer data. There were 26,996 type records, 16,4726 direct effect calving ease records, and 45,261 maternal effect calving ease records in the analyses Of calvings involving adult cows. Multiple-trait REML was used to estimate genetic correlations between calving ease and type. The heritability of calving ease in heifers was approximately 4%, for both the direct and maternal effect, and in adult cows was approximately 1.5%. Heritability of the type traits ranged from 4 to 45%. There was a tendency for the genetic correlations between type and the direct effect of calving ease to be opposite in sign to the genetic correlations between type and the maternal effect of calving ease and for the absolute value of the correlations to be lower in adult cows than in heifers.

Key Words: type traits • calving ease • genetic correlations

Submitted on November 21, 1989
Accepted on July 9, 1990




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Copyright © 1990 by the American Dairy Science Association ®.