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Average Relationship Within a Herd

Plant Breeding Department, Cornell University, Ithaca, New York¹

ABSTRACT

Methods have been developed, based on the use of variances and covariances, for obtaining coefficients of inbreeding and relationship. These have been extended to the problem of estimating average values of the coefficient within a herd, and they also enable interherd coefficients of relationship to be calculated. Results are given of an analysis made of a sample of 17 purebred Jersey herds in New Zealand, using these methods. The mean inbreeding coefficient for a herd was 1.6%, and the mean coefficient of relationship was 0.078.

¹ Paper No. 435 of the Plant Breeding Dept., and No. BU-75 of the Biometrics Unit, Cornell University. The bulk of this paper was prepared when the author was with the New Zealand Dairy Board, Wellington, New Zealand.