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The phenomena of social facilitation of feeding behaviour in chicks were investigated.Forty-eight White Leghorn chicks were divided at random into three groups: 8 chicks were caged individually (Group 1), 16 chicks were caged in pairs (Group 2) and 24 chicks were caged by three chicks (Group 3). They were brought up from 1 to 5 weeks of age in 8 brooding cages per group. The living space per chick was 15×25×21cm equally in each group. Chicks in each brooding cage were visually isolated from each other.The total amount of feed intake and the body weight of chick were measured weekly for each group throughout the experimental period, and the amount of feed intake within first 30 minutes after feeding were measured only from 4 to 5 weeks of age. Synchronization on feeding behaviour in Group 2 and Group 3, and duration time of feeding behaviour in three groups were investigated by both direct observation and photographing intermittently at intervals of 10 seconds.The amounts of feed intake, the body weights and their weekly gains were increased in proportion to colony sizes from 1 to 3 birds, and there were significant differences among three groups. The variation of body weights was smaller and the feed efficiency was better in Group 2 than the other groups.It was observed that chicks in every groups had intaken about 10% of total amount of feed in a day within first 30 minutes after feeding, and this amount of feed soon after feeding was more in Group 1 and less in Group 3 than in Group 2.In Group 2 and Group 3, the frequencies of the case where plural chicks were feeding together at the same time were significantly higher than where a bird alone. The total fregency of feeding behaviour within an unit time in Group 3 had a tendency to be more frequent than in Group 2. Duration time of feeding behaviour was inclined to be longer in Group 1 than other the groups.It was concluded that feeding behaviour in chick was socially so facilitated that group feeding brought synchronization of feeding and increase in feed intake per chick, and that chick in Group 1 had the lower threshold of feeding stimulus because of the lack of social stimulus for facilitation of feeding behaviour.
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