Epp, M.P.Blasi, Dale A.Johnson, B.J.Kayser, J.P.Grieger, David M.2010-08-032010-08-032010-08-03http://hdl.handle.net/2097/4417A 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.BeefSteroidBrain monoamine oxidase type A (MAO-A) activityBuller steersConference paper