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Journal of Animal Science, Vol 69, Issue 10 3952-3958, Copyright © 1991 by American Society of Animal Science

JOURNAL ARTICLE

Genetic parameters for calving ease and survival at birth in Angus field data

A. C. Cubas, P. J. Berger and M. H. Healey
Iowa State University, Ames 50011.

Calving performance records from the American Angus Herd Improvement Registry files were used to estimate variance components for calving ease and survival to 24 h. Genetic parameters for direct and maternal effects were estimated by using a sire-maternal grandsire model. Data included two independent samples of 19 and 34 herds with complete calving information. Maternal variance for calving ease was much larger than the variance for the direct effect of the sire. Maternal heritability for calving ease was .27 and .20 in the two samples of herds, respectively. Heritabilities for direct effects were .21 and .07. The genetic correlations between direct and maternal effects were -.93 and -.80. There was little genetic variation in survival at birth. Parameter estimates were within the allowable parameter space in the sample of 19 herds. Heritability for the direct effect of the sire on survival was .04. Maternal heritability was .09, and the direct-maternal correlation was -.85.


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D. G. Riley, C. C. Chase Jr., T. A. Olson, S. W. Coleman, and A. C. Hammond
Genetic and nongenetic influences on vigor at birth and preweaning mortality of purebred and high percentage Brahman calves
J Anim Sci, June 1, 2004; 82(6): 1581 - 1588.
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Copyright © 1991 by the American Society of Animal Science.