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Effects of Age on Avoidance Learning in Pigs¹

Iowa State University, Ames

Abstract

Pigs from two breeds were tested on an avoidance learning task at ages 21, 40, 80 and 150 days. Duroc pigs were better avoidance learners than Hampshire pigs at all ages tested. The achieved level of learned responses decreased .16% per day during the test. Hence, younger pigs reached higher levels of avoidance learning performance than their older full-sibs.

The heavier pigs within the litters were the better learners. Weight accounted for 7.2% and 4.6% of the variance within litters for 80- and 150-day learning scores, respectively.

¹ Journal Paper No. J-6010 of the Iowa Agricultural and Home Economics Experiment Station, Ames, Iowa. Project No. 1424. This work has received assistance from Contract AT(11-1)-707 from the U.S. Atomic Energy Commission.

² Present address: University of Kentucky.