Abstract
Gonadotropic and LTH cells of the pituitaries of chickens at the age of 14, 30, or 90 days, treated with estradiol dipropionate (Oe) on Day 4, 8, or 13 after hatching have been examined. The results obtained up to now can be summarized as follows: Small-sized “signet” gonadotrops were the predominant gonadotropic cells in the pituitaries of 3-month-old chickens if they were treated with a single dose of 2500 μg Oe on Day 4 or 8 after hatching. We considered the gonadotropic cells with more granulated nucleoli, pronounced dilatation of GER vesicles, and the specific granules, as LH-like cells. They were localized in the caudal lobe, and the gonadotropic cells in the cephalic lobe appeared as FSH cells. A large number of dark cells representing a regressive form of gonadotrops could be the result of the direct or indirect effect of Oe administered on Day 4 after hatching. The reciprocal interrelationship between the gonadotrops and LTH cells was expressed in the animals treated on Day 8 after hatching. In the LTH cells of the pituitary of 3-month-old chickens, GER cavities were cisternoid and in some of them a single vacuole appeared, giving an impression of “signet” LTH cells. Signs of similar reaction to Oe by gonadotrops and LTH cells were not observed in 3-month-old roosters treated with Oe on Day 13 after hatching.
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