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Composition of Cows' Milk. II. Genetic Influences ¹

Department of Dairy Science Virginia Polytechnic Institute, Blacksburg

ABSTRACT

Heritabilities and genetic correlations were estimated from 4,552 records on 3,472 Holstein-Friesian cows by 630 sires. Heritabilities by paternal half-sib correlation of deviations from herdmates were milk yield, .23; fat yield, .09, solids-not-fat yield, .22; fat per cent, .45; and solids-not-fat per cent, .47. Heritabilities by regression of daughter on dam with 438 pairs of records were milk yield, .37; fat yield, .22; solids-not-fat yield, .27; fat per cent, .55; and solids-not-fat per cent, .25. Genetic correlations among yields were milk fat, .79; milk solids-not-fat, .95; fat solids-not-fat, .85. Selection for milk yield should give 94% as much gain in solids-not-fat yield as would direct selection for solids-not-fat yield.

¹ Research supported in part by grants from the Dairy Foundation of Virginia, Inc.

² Present address: Department of Biology, Shepherd College, Shepherdstown, West Virginia.