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Journal of Dairy Science Vol. 72 No. 3 664-670
© 1989 by American Dairy Science Association ®
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Inverse Numerator Relationship Matrix Approximation1

J. F. Taylor and M. A. Tomaszewski

Department of Animal Science, Texas A&M University, College Station 77843

ABSTRACT

Genetic evaluation by BLUP requires knowledge of the inverse numerator relationship matrix among breeding values. When pedigree information is complete, the true relationship matrix can be determined and an exact inverse found. When pedigree information is incomplete, an exact inverse of an approximate relationship matrix is obtainable. The usual algorithm for the inverse numerator relationship matrix may be derived assuming each unidentified parent to be a different base population animal.

FOOTNOTES

1 Technical Article 23829 of the Texas Agricultural Experiment Station, College Station 77843. Project 2491, a contribution to Southern Regional Project S49, Genetic Methods of Improving Dairy Cattle for the South.






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