Abstract
Pigs were reared in either a warm (35°C) or a cold (10°C) environment for 6 weeks. When exposed to a 15°C environment in which they could obtain 6 sec of infrared heat by pushing a panel switch, pigs reared in the cold obtained more reinforcements than pigs reared in the warm whether they were tested (a) immediately after removal from their respective environments, or (b) after exposure to an intermediate temperature (22.5°C) for 15–18 hr. Possible explanations for the difference in reinforcement rate are discussed. It is concluded that the higher reinforcement rate in cold-reared pigs than in warm-reared pigs is due to them having a greater thermal demand as a result of their inferior tissue insulation and, to a higher set-point than the warm-reared pigs.
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