Abstract
Summary
(1) It was found that sheep pituitary glands contain the greatest amount of LH, while those from cattle had very little. Hog pituitary glands showed great variation with respect to LH content but in all cases contained much less than sheep glands. (2) The inhibiting action of the pituitary preparations paralleled their LH content. (3) Hog and sheep pituitary glands are approximately equal in producing ovarian hypertrophy. Hog preparations produced mainly follicular development while those of sheep caused the development of heavily luteinized ovaries. Hog glands, therefore, contain more FSH than those of sheep. Beef pituitary glands are a very poor source of FSH. (4) The FSH and LH content of different lots of pituitary glands of the same species varies within wide limits. Nevertheless, those of each species show definite characteristics, with respect to their FSH and LH content.
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