Abstract
Summary
The lactogen content of the anterior pituitary of two types of pigeons, the common and the White King, were compared in both sexes. As in mammals, the pituitaries of the male pigeons contained only 1/2 to 1/3 as much lactogen as the female by all methods of comparison even though the male pigeon aids in the incubation of the eggs and in feeding the squabs.
The common female pigeon, although considerably lighter in body weight than the White King, contains as much or more lactogen per pituitary. Per 100 g body weight, the pituitary of the White King contains only 1/2 to 2/3 as much lactogen as the common pigeon.
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