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Journal of Dairy Science Vol. 62 No. 8 1304-1313
© 1979 by American Dairy Science Association ®
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Daughters' Maternal Grandsires in Sire Evaluation

R. W. Everett, R. L. Quaas and A. E. McClintock1

Department of Animal Science, Cornell University, Ithaca, NY 14853

ABSTRACT

First lactation records of 808,796 artificially sired cows in the Northeast United States were used to compare sire evaluations with and without maternal grandsires in the model. Maternal grandsires were identified on 55.7% of the records. Including maternal grandsire increased percent filled subclasses in absorbed best linear unbiased prediction equations by 43% (Guernseys) to 95% (Holsteins). Rank correlations between sire evaluations for the two models ranged from .91 (Ayrshires) to .97 (Holsteins). Product moment correlations ranged from .92 to .98. Holstein sires changed an average of 52 kg of milk. Negative assortative mating (good sires and poor maternal grandsires) was observed in the Guernsey and Brown Swiss breeds. Positive assortative mating (good sires and good maternal grandsires) occurred in the Ayrshires, Holsteins, and Jerseys. Including maternal grandsires of cows in the model is a step toward utilizing more genetic relationships in a practical sire evaluation system.

FOOTNOTES

1 Milk Marketing Board, Thames Ditton, Surrey, England.




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H. D. Norman, P. M. VanRaden, R. L. Powell, J. R. Wright, and W. R. VerBoort
Effectiveness of National and Regional Sire Evaluations in Predicting Future-Daughter Milk Yield
J Dairy Sci, February 1, 2005; 88(2): 812 - 826.
[Abstract] [Full Text] [PDF]


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