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Cystic Pituitary in Young Cattle with Vitamin A Deficiency¹

Two Plates (Five Figures)

Animal Nutrition Division, Bureau of Animal Industry, and Division of Nutrition and Physiology, Bureau of Dairy Industry, United States Department of Agriculture, Beltsville Research Center, Beltsville, Maryland

Cases of cystic pituitary glands have been found in young beef and dairy cattle either suffering from vitamin A deficiency or with a history of early severe vitamin A depletion. The cysts occurred either in the residual lumen or within the posterior lobe, often causing compression of the gland and injury to the glandular parenchyma. No evidence of repair in a cystic pituitary was found in an animal that was vitamin A deficient early in life but later fed adequate amounts of carotene, suggesting that the injury of the gland may be permanent.

Manuscript received 12 January 1942.