INHIBITION OF THE CARMINE-CELL REACTION IN THE PITUITARIES OF CATS WHICH MATE BUT DO NOT OVULATE

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Abstract
Various non-specific abdominal operations in the cat, if done early after mating, interfere with the usual effect of coitus which normally stimulates the gonadotrophic activity of the ant. pituitary gland and thus induces ovulation. Evidence of stimulation of the pituitary is the appearance of acidophiles with an affinity for azocarmine rather than orange G (for-mol-corrosive sublimate fixation, Azan staining method). The extent of the carmine-cell reaction in pituitaries of cats which mate but do not ovulate is significantly less than that which is found in animals after a normal mating. Also the preovulatory degranulation of the carmine-cells does not occur. No interference with ovulation occurs in animals operated upon 6 hrs. postcoitum. At this time the carmine reaction normally has passed its maximum, with evidences of degranulation, and the cumulus reaction in the mature ovarian follicle has already begun.

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