Abstract
Fisher et al. (1967) have shown that pancreatic xanthine dehydrogenase in newly hatched chicks is induced by feeding whereas this enzyme in the liver, kidney, and duodenum is unaffected by the ingestion of food. This induction is due to some substance(s) in the feed and not to the nutritional balance of the diet. An extensive examination of the pancreatic system has shown that there is a 3000-fold increase in total activity between day 19 (2 days before hatching) and day 15 after hatching with chicks fed a normal diet. Unfed chicks exhibit an activity of 0.4% of maximum value and egg-fed chicks a level of 6.3%. Between the second and third weeks after hatching, specific activity in the pancreas decreases to about one-half the maximum level. When these older chicks are fasted or fed egg, activity falls and refeeding the normal diet causes a sharp increase in activity to a level double that of continuously fed chicks. These results indicate that some change occurs in pancreatic tissue slightly before hatching which allows enzyme production, and after this time activity is controlled by a dietary inducer and a “repressing effect” formed in response to the inducer.
Published Version
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