LA CROISSANCE DU PANCRÉAS CHEZ LE RAT PENDANT LA VIE POST-NATALE

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Abstract
In function of body weight 3 stages of growth were ascertained in post portum rats using allometrical relations. In the 1st stage the animals are aged between 2 and 15 days and weigh between 4 and 16 g. In this stage the weight of the pancreas (k = 0.735) increases proportionally less than that of the body; whereas the cell count of pancreatic tissue increases in the same proportion (k = 0.969). Thus, it would seem, given the discrepancy between the allometrical coefficients, that the cell circumference decreases in this stage. In the 2nd stage, encompassing the 15th to the 30th day, the alometrical coefficients are for the pancreas k = 2.170 and for the cell count k = 1.818, which implies a more rapid growth of the pancreas relative to the body. In the 3rd stage (older animals) the coefficients are found to decrease again so that pancreas growth is similar to that of the first stage. The study of the relative pane reas weight (mg of pancreas/100 g body weight) in function of the age agrees with the results acquired with allometrical relations insofar as 3 evolutionary phases were differentiated. It was furthermore detected that sexual differences in the relative weight set in after the 26th day of the post partum life.