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Genetic Parameter Estimates Based on Selected and Control Beef Cattle Populations^1,2,3,4,

University of Kentucky, Lexington 40546, North Carolina State University, Raleigh 27607, University of Tennessee, Knoxville 37916, and US Department of Agriculture, Knoxville, TN 37916

Abstract

Genetic parameters were estimated for birth weight, weaning weight, postweaning rate of gain and yearling weight from beef cattle data collected on populations subjected to selection as well as from data collected on genetic control populations. Data from three stations in the Southern Region were combined and analyzed separately for each line-sex of calf combination (select males, control males, select females, control females). Heritability estimates for birth weight, weaning weight, postweaning rate of gain and yearling weight for genetic control males were 1.7, 1.3, 7.0 and 3.0 times larger, respectively, than estimates for select males. Corresponding values for genetic control females were 1.1, 2.4, 2.3 and 3.5 times larger than estimates for select females. Results obtained for the genetic correlations were more inconsistent than those obtained for the herita-bilities; however, phenotypic correlations were similar for the genetic control and select populations.

¹ Published with the approval of the Director of the Kentucky Agr. Exp. Sta. as Journal Article 80-5-173.

² Published with the permission of the Dean, North Carolina State Univ., Raleigh.

³ Published with the permission of the Dean, Univ. of Tennessee Agr. Exp. Sta., Knoxville.

⁴ A publication of Southern Regional Beef Cattle Breeding Project, S-10.

⁵ Dept. of Anim. Sci., Univ. of Kentucky, Lexington.

⁶ Dept, of Anim. Sci., North Carolina State Univ., Raleigh.

⁷ Dept. of Anim. Sci., Univ. of Tennessee, Knoxville.

⁸ ARS, USDA, Univ. of Tennessee, Knoxville.