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Genetic Analysis of Open Field Behavior in Swine¹

Iowa State University, Ames

Abstract

Data on open field score (OF) of 1853 Duroc and Hampshire pigs were obtained from a swine irradiation project at Iowa State University. OF is the number of squares, marked on the floor of a strange pen, into which a pig stepped in the first 2 min. when put into the pen alone.

Heritability of OF was 0.16. OF was significantly affected by season of the year. The effect of breeds and the interaction of sex by season of the year approached significance. OF had a significant phenotypic correlation of – .23 with weight at 154 days, but was uncorrelated with weights at younger ages or with backfat thickness on the live animal.

¹ Journal Paper No. J-5308 of the Iowa Agricultural and Home Economics Experiment Station, Ames, Iowa. This work was supported by Contract AT(11-1)-7O7 from the U. S. Atomic Energy Commission. The senior author held a Thomas Lawrence Pawlett Traveling Scholarship, from the University of Sydney, and a Fulbright Travel Grant.

² Present address, School of Agriculture, University of Melbourne, Parkville, N. 2., Australia.