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Histology of the Pituitary, Testis, and Adrenal in Relation to Reproduction in the Bull

Department of Animal Husbandry, University of California, Davis

ABSTRACT

The relation between the histology of the endocrine organs and reproduction in bulls has not been studied extensively. Most of the reports dealing with normal and impaired fertility have been limited to the changes occurring in a single organ. In order to estimate the relative importance of the several possible causes of impaired fertility, the histology of the pituitary, adrenal, and testis in bulls is being studied at this station.

Smith and Smith (11) described the separation of the anterior lobe of the bovine pituitary into a central and peripheral zone. Bassett (1) described the central portion of the anterior lobe as a core running through the gland. She also stated that the peripheral portion of the lobe contains many alpha cells, whereas the central portion is devoid of alpha cells but rich in beta cells. Bassett (1) and Hall (6) described two kinds of beta cells in the anterior pituitary of cattle.