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Journal of Dairy Science Vol. 59 No. 1 137-152
© 1976 by American Dairy Science Association ®
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Estimating Son's Progeny Test from His Pedigree Information1

K. R. Butcher and J. E. Legates, Dean

Department of Animal Science
School of Agriculture and Life Sciences, North Carolina State University Raleigh 27607

ABSTRACT

United States Department of Agriculture Dairy Herd Improvement files were used to assemble pedigrees on 705 artificial insemination and 2293 nonartificial Holstein bulls. Each pedigree contained estimates of breeding values (twice Predicted Differences) for son, sire, and maternal grandsire based on proofs of first lactation daughters versus herdmates with all lactations, and various estimates of breeding value of the dam from deviations of her individual lactations from herdmates. Pedigrees on 340 sons entering artificial insemination as young bulls gave correlations of .47 between son and son's pedigree index, .43 between son and sire, .24 between son and maternal grandsire, and .21, .16, .16, .08, and .08 between son and dam's lactations one through five. With the exception of the correlations of son with dam's lactations four and five, values are close to expected. Young bull indexes based on United States Department of Agriculture Predicted Differences and Cow Indexes can provide an effective tool for screening applicants for a young sire sampling program. Possible refinements would be to give the dam's first lactation more weight than later lactations or to use only the first three lactations in computing her Cow Index.

FOOTNOTES

1 Paper number 4637 of the Journal Series of the North Carolina Agricultural Experiment Station, Raleigh.






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Copyright © 1976 by the American Dairy Science Association ®.