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Genetic Analysis of the Components of Type Conformation and Production in Ayrshire Cows^{1, 2,}

Department of Dairy Husbandry, West Virginia University, Morgantown

ABSTRACT

The phenotypic and genetic correlations between final type score and production in dairy cattle have been estimated by Harvey and Lush (3) and by Touchberry (7). Harvey and Lush's data show that for all practical purposes the genetic merit for over-all type conformation may be estimated independently of production and the genetic merit for production may be estimated independently of over-all type conformation with little loss in the accuracy of estimation of an individual's true breeding merit. In other words, when selection is practiced for production alone, little or nothing is to be gained by using type scores in addition to records of production. Touchberry estimated the phenotypic correlations between milk production and over-all type score and between butterfat production and over-all type score to be 0.182 and 0.258, respectively, and the genetic correlation was estimated to be zero in each instance. These estimates imply that type score should receive negative emphasis when utilized in the selection for butterfat production.

¹ Based in part on a thesis submitted in partial fulfillment of the requirements for the degree of Master of Science at West Virginia University.

² Published with the approval of the Director of the West Virginia Agricultural Experiment Station as Scientific Paper No. 494.

³ Present address: Department of Animal Husbandry, Cornell University, Ithaca, N. Y.

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