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Estimation of Genetic and Phenotypic Parameters of Weaning Traits in Beef Cattle¹

Cornell University, Ithaca, New York

Abstract

The genetic and phenotypic parameters of average daily gain from birth to weaning (ADG) and type score at weaning (TS) have been evaluated from 4,838 records on beef cattle in New York. The records were drawn from 39 herds with 121 sires of the Angus breed and from 16 herds with 55 sires of the Hereford breed for the years 1949 to 1960 inclusive.

The data were tested for the presence of interaction effects. Estimates were obtained by an iterative procedure of the effects of sex, age-of-dam and year differences on the two traits. The records were adjusted for these fixed effects and components of variance and covariance were estimated for herds, sires, herds by years, and error. These components were used to compute estimates of the heritability of each trait and of the genetic, phenotypic and environmental correlations between them.

¹ Based in part on a thesis submitted by the senior author to the Graduate School, Cornell University, in partial fulfillment of the requirements for the Ph.D. degree.

² Present address: Animal Breeding and Genetics Department, The Agricultural Institute, Castleknock, Co. Dublin, Ireland.