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Evaluation of Two Rotational Crosses of Swine on the Basis of Their Crossbred Progeny Performance^1,2,

University of Minnesota, St. Paul

Abstract

There is a need for evaluating standard and new breeds of swine according to their performance records. The results obtained from comparing different breeds of swine would be of interest to both the commercial producer and the purebred breeder. The commercial producer would be able to select the higher producing breeds with better combining abilities when determining his crossbreeding program; the purebred breeder could concentrate on the more promising breeds for further development and improvement in the pure breeds. A generally accepted crossbreeding system in this country today is a rotational crossing program with major emphasis on the use of crossbred sows.

A three breed rotational crossbreeding system in swine provided the data for this study. The objective of the work reported here was to compare two rotational crosses of swine on the basis of their crossbred progeny performance. The first rotation included three new breeds of swine developed at the University of Minnesota and the second was a standard breed rotational cross of three widely used breeds in the United States.

¹ Paper No. 6768, Scientific Journal Series of the Minnesota Agricultural Experiment Station in cooperation with A.H.R.D., A.R.S., The Regional Swine Breeding Laboratory, U.S.D.A.

² This work was supported by a grant from the Louis W. and Maude Hill Family Foundation, St. Paul.

³ This paper represents part of a thesis submitted by the senior author to the Graduate School of the University of Minnesota in partial fulfillment of the requirements for the degree of Master of Science.