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Selection of Fine-Wool Rams Based on Record of Performance Data

Texas Agricultural Experiment Station

Abstract

Studies are reported which had as their primary objective the development of a selection index for application to performance records on finewool rams. Included are estimates of the relative economic importance, phenotypic and genotypic correlations and heritability of rate of gain, body conformation, face covering, skin folds, staple length and clean wool production. The heritability estimates obtained were weaning weight and rate of gain, 0.22; conformation, 0.04; face covering, 0.54; skin folds, 0.34; staple length, 0.48; and clean wool, 0.22. The index derived indicated that primary emphasis should be placed on rate of gain, face covering and staple length.

¹ Acknowledgment is made to Dr. W. T. Hardy and staff of Substation 14, Sonora for assistance in collecting the data used.

² Assistant Animal Husbandman, Substation 23, McGregor, Texas, and former Assistant Animal Husbandman, Substation 14, Sonora, Texas.