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Heritability, Genetic and Phenotypic Correlations of Type, Certain Components of Type, and Production of Brown Swiss Cattle¹

Department of Dairy Science, University of Idaho, Moscow

ABSTRACT

The heritabilities of final type and eight components of type were estimated by doubling the intra-sire regression of daughter's single type score on dam's single type score from 3,161 daughter-dam comparisons by 294 sires. The heritability estimates were: General appearance .33, dairy character .30, body capacity .23, rump .36, feet and legs .19, mammary system .23, fore udder .28, rear udder .35, and final type .35.

The average within-sire phenotypic and genetic correlations between final type, all combinations of the components of type, and butterfat production were estimated from single type and butterfat records. Records on 3,161 daughter-dam pairs were used to estimate genetic correlations, and records on the 3,161 daughters were used to estimate phenotypic correlations.

The various genetic correlations between the components of type were positive and relatively large, indicating that positive selection can be made for these components of type simultaneously. The genetic correlation between final type and butterfat production was .24, indicating that selection on the basis of type alone should automatically bring about some genetic improvement in production.

¹ Published with the approval of the Director of the Idaho Agricultural Experiment Station as Research Paper No. 480.