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The Incidence of Extramedullary Myelopoiesis in Bovine Adrenal Glands¹

University of Massachusetts²

Abstract

Extramedullary myelopoiesis appears to be a relatively common condition in the adrenal glands of cull dairy and beef cattle, occurring in 23% of 105 animals examined. The lesions involve any or all of the zones of the cortex and vary substantially in shape and size from gland to gland.

The data from this investigation, based upon limited numbers, indicate that the condition is not related to fertility or to pregnancy. The breed and sire data in this investigation suggest a possible genetic basis but this cannot be demonstrated without further investigation. The syndrome may be associated with the age of the individuals, being more common in older cattle.

¹ Supported by the Northeast Cooperative regional project NE-1 "Causes and Prevention of Reproductive Failures in Cattle" and by funds from Dairy Husbandry Research Branch, USDA, Beltsville, Maryland.

² Cont. No. 1075 of the University of Massachusetts, College of Agriculture Experiment Station, Amherst.