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Response to Recurrent Mass Selection for Small Size in Swine¹

University of Minnesota, St. Paul 55101

Abstract

Continued selection for decreased 140-day weight in swine resulted in observed reductions of 40% in one sublime and 28% in the other sublime from the average weight of the foundation herd when the lines were separated. The failure to distinguish between genetically small pigs and their phenocopies at the time of selection was discussed. This typical problem of a downward selection program was given as a possible explanation for the disagreement between observed and predicted responses. Estimates of moderately high 140-day weight heritabilities indicate that selection for decreased body size should continue to be effective.

Selection for reduced 140-day weight was accompanied by a reduction of one pig per litter. This may be due to a correlated response or due to the effect of an increase in inbreeding.

¹ Paper No. 7153 Scientific Journal Series, Minnesota Agricultural Experiment Station and Hormel Institute No. 582. The work was supported by the National Institute of Health Grant HE-1730.

² Present address: University of Ibadan, Ibadan, Nigeria.