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The development of pancreatic tissue (fresh weight, total proteins, RNA and DNA) and of the level of pancreatic enzymes (trypsin, chymotrypsin, lipase and amylase) of the piglet has been followed from birth to the age of 8 weeks in 10 animals at each of 7 stages. There was an increase with age and body weight of the total fresh weight of the exocrine pancreas. From birth until 4 weeks the development of the pancreatic gland was due to hyperplasia; from the 4th week till the 8th week of age, it was due both to hyperplasia and hypertrophy. There was a specific period, at the age of 3–4 weeks, from which total enzymatic activities markedly increased. Furthermore, from the 4th week of age there was a rise in the intake of total dietary proteins, fat and carbohydrates, due to the intake of solid food.

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