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Histology of the Pituitaries, Adrenals, Ovaries, and Uteri of Dairy Cattle Associated with Different Reproductive Conditions

Department of Animal Husbandry, University of California, Davis

ABSTRACT

Previous studies of the pituitaries, adrenals, ovaries, and uteri of cattle have indicated a relationship between histological changes in these organs and various conditions of reproduction. Several of the cell types found in the anterior lobe of the pituitary have been found to undergo changes in structure or number in relation to the animal's reproductive condition. Garm (5), in a study of normal dairy cows, described the following cell types: chromophobes, acidophils with a small nucleus, acidophils with a large nucleus, small basophils, large basophils, hyaline basophils, and heterotrophic basophils. In cows with nymphomania he found an increase in frequency of large basophils, chromophobes with a large nucleus, hyaline basophils, and hypertrophic amphophils. Two kinds of beta cells in the central zone of the anterior lobe have been described by Bassett (1) and Hall (8), Bassett reporting that the small basophil cells were almost absent from steer pituitaries but were increased in pregnant cows or cows treated with stil-bestrol.