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Efficiency and Effectiveness of Selection in Crossbred Swine

University of Nebraska¹

Abstract

SELECTION studies have received considerable attention in the Regional Swine Breeding Laboratory during recent years. These studies have been concerned primarily with selection in inbred lines. The results of a cooperative study of selection in inbred lines are reported by Dickerson et al. (1953). In general, these results have indicated that progress is not as rapid as might be expected on the basis of selection differentials and heritability estimates for productivity items. The purpose of this investigation was to study selection for productivity traits in a swine herd of crossbred origin.

Material and Methods

Nebraska initiated a crossbreeding project at the Lincoln Station in the spring of 1946. Initial crosses were Landrace x Duroc. Two Landrace boars obtained from the Beltsvi]le Station were mated to ten gilts from North Platte Line I0, to farrow in the spring of 1946, and to 10 gilts from the Lincoln outbred herd to farrow in the fall of 1946.

¹ Published with the approval of the Director as Paper No. 623. Journal series, Nebraska Agricultural Experiment Station in cooperation with the Regional Swine Breeding Laboratory, Ames, Iowa, Bureau of Animal Industry, U.S.D.A. This paper is condensed from a thesis submitted to the Graduate Faculty of the University of Nebraska in partial fulfillment of the requirements for the degree of Doctor of Philosophy.