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Abstract
1. The proline disappearance from the jejunal and ileal lumen of chickens aged from 1 day to 15 weeks were studied using a perfusion method "in vivo”.
2. A decrease in proline transport was observed from younger to older animals. The 2 intestinal segments showed different behaviours, the 1‐day and 1‐week‐old animals showed the same value in the jejunum, whereas in the ileum a progressive decrease in proline transport was observed from the first week of life.
3. The differences observed in the 2 segments could be attributed to the different rates of growth of the jejunum and ileum with age; the jejunum showed a peak of growth in the second week of life whereas the ileum showed a peak of growth in the first week. Proline transport in the jejunum decreased until the fifth week and remained constant thereafter.