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A Discussion of the Genetic Aspects of Weight, Mature Weight and Rate of Maturing in Hereford and Angus Cattle¹

University of Arkansas, Fayetteville 72701 and U.S. Department of Agriculture, Knoxville, Tennessee 37919

Abstract

PAST genetic studies in beef cattle have emphasized point evaluation of growth over relevant economic time periods. In general, the measurements considered have been confined to constant ages, constant time periods or, occasionally, over a constant weight period (Swiger et al., 1962; Brown and Gifford, 1962; Thrift et al., 1970; Nelms and Bogart, 1955). Many aspects of development patterns and interperiodic relationships have been neglected as a consequence of using a few select measurements to evaIuate growth. Certain characteristics of growth such as rate of maturing and mature size cannot be measured on immature animals, yet these or related measures are necessary to give perspective to the single measurements made on animals. This concept was considered in some detail by Brody and his coworkers, yet it has received only limited consideration since 1950 (Brody, 1945; Taylor, 1965; Fitzhugh and Taylor, 1971; Timon and Eisen, 1969).

One objective of this study was to obtain estimates of mature weights and rate of maturing for Hereford and Angus females.

¹ Published with the approval of the Director of the Arkansas Agricultural Experiment Station.

² Department of Animal Science, University of Arkansas, Fayetteville.

³ Animal Science Research Division, A.R.S., University of Tennessee, Knoxville.

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