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Intrapopulation Versus Reciprocal Recurrent Selection in Swine¹

University of Wisconsin, Madison 53706

Abstract

The lack of response to intrapopulation selection for certain performance traits in swine during the development of mildly inbred lines suggested selection between complementary strains for maximizing performance (Dickerson, 1952; Dickerson et al., 1954). This approach for capitalizing on specific combining ability was proposed as recurrent selection by Hull (1945) and as reciprocal recurrent selection by Comstock, Robinson and Harvey (1949) for corn and, subsequently, with reference to swine, by Comstock (1960, 1961). Research on reciprocal selection with swine was started in the early 195O's at Wisconsin and at several other experiment stations cooperating in the Regional Swine Breeding Laboratory.

The main objective of the present study was to compare the performance of crossbred progeny which came from stock selected primarily on crossbred performance (reciprocal recurrent selection—R.R.S.) with those which came from stock selected on the basis of pure-bred performance (intrapopulation selection—I.S.).

The investigation was carried out from the fall of 1953 through the spring of 1965, during which period seven and five cycles of selection were completed in the intrapopulation index selection (I.S.) and reciprocal recurrent selection (R.R.S.) groups, respectively.

¹ Published with the approval of the Director of the Agricultural Experiment Station. Paper No. 1275 from the Genetics Laboratory and No. 543 from the Department of Meat and Animal Science in cooperation with the Regional Swine Breeding Laboratory, A.H.R.D., A.R.S., U.S.D.A.

² Present address: Regional Poultry Farm, (Government of India), Hessarghatta, Bangalore, India.

³ Present address: Department of Animal Science, Iowa State University, Ames.

⁴ The authors wish to acknowledge the help of Drs. G. E. Bradford, O. W. Robison and Messrs. P. V. Hurt and J. L. Wheaton in collecting data through 1961. They also appreciate the important role played by the herdsmen Alfred Gerbitz and Marvin Lehr throughout the experiment.