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A Simple Method of Obtaining Selection Index Weights¹

North Dakota State University^,3, Fargo 58105

Abstract

A simplified method of obtaining selection index "b" weights was derived for a single trait selection in the situation where the covariances among the averages of the records of the genetic groups are equal and the covariances between the averages of the records of the genetic groups and the true value predicted are equal. The variances of the averages need not be identical, nor is there a limit to the number of genetic groups. A computer is not needed. The obvious situations of applicability are those in which one-half genetic values of parents are predicted from progeny performance when only a hand calculator is available. The method involves little more than adding up the reciprocals of the differences resulting when the common covariance among the genetic groups is subtracted from the variances of the averages of the genetic groups.

¹ Published with the approval of the Director of the North Dakota Agr. Exp. Sta. as Journal Article No. 1206.

² Current address: P. O. Box 12915, Central Post Office, Ibadan, Oyo State, Nigeria.

³ Anim. Sci. Dept.