J. Anim Sci.
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J. Anim Sci. 1981. 53:940-945.
© 1981 American Society of Animal Science
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Interactions Involving Sires, Breed of Dam and Age of Dam for Performance Characteristics in Limousin Cattle1

M. E. Massey2 and L. L. Benyshek3

University of Georgia, Athens 30602

Abstract

Field records provided by the North American Limousin Foundation performance testing program were edited into two data sets and analyzed to determine the importance of the sire x breed of dam and age of dam x breed of dam interactions. The data sets contained records on 50% Limousin calves with Hereford or Angus dams. Significant interactions were found between sire and breed of dam for birth weight, preweaning average daily gain, adjusted 205-day weaning weight, yearling weight, adjusted 365-day weight and weight per day of age. The percentage of total variation accounted for by the interaction ranged from .2 for postweaning average daily gain to 1.7 for yearling weight. Percentages of total variation accounted for by the sire components ranged from 1.5 for postweaning average daily gain to 6.3 for birth weight. The correlation of breeding values for the same trait across breeds of dams ranged from .57 to .85. Estimates of heritability were reduced when the sire x breed of dam interaction was considered in the estimation procedure. Estimates of genetic correlations between traits tended to be increased when the interaction was taken into consideration. The age of dam x breed of dam interaction was significant for preweaning average daily gain, adjusted 205-day weaning weight, postweaning average daily gain and weight per day of age.

Footnotes

1 The authors wish to acknowledge that a portion of this research was financially supported by The North American Limousin Foundation, Denver, CO 80216.

2 This paper represents part of a dissertation submitted by the senior author to the Graduate School, Univ. of Georgia, in partial fulfillment of the requirements for the Ph.D. degree in Anim. Sci.

3 Anim. and Dairy Sci. Dept.






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