Cattlemen's Day, 2004; Kansas Agricultural Experiment Station contribution; no. 04-242-S; Report of progress (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service); 923; Beef; Steroid; Brain monoamine oxidase type A (MAO-A) activity; Buller steers
A grazing/feedlot field study was conducted to evaluate the steroid hormone profile and brain monoamine oxidase type A (MAOA) activity of steers exhibiting characteristics attributed to the Buller Steer Syndrome in a feedlot environment. Differences of serum progesterone, testosterone, and estrogen were found in bullers at different phases of production. Brain MAO-A activity was greater in bullers than in non-bulling steers. This study suggests that MAO-A activity, under potential influence of steroidal hormones in the steer brain, may be a plausible mechanism that induces Buller Steer Syndrome.
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Epp, M.P.; Blasi, Dale A.; Johnson, B.J.; Kayser, J.P.; and Grieger, David M.
"Steroid hormone profiles and brain monoamine oxidase type A (MAO-A) activity of buller steers,"
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