Abstract
1. 1. The influence of length of light:dark cycle on motor activity, food intake and growth has been investigated in young pigs subject to either 12 hr light:12hr dark, or 9hr light:9hr dark. 2. 2. Motor activity was positively correlated with the light phase in both groups. No differences were found in growth rate or in the average amount of food eaten in a 72 hr period between the two treatments. Body conformation and composition were also similar. 3. 3. Thus, unlike many other mammals the young pig can synchronize its activity to a non-circadian rhythm. Moreover, this does not affect growth.
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