Steroid hormone profiles and brain monoamine oxidase type A (MAO-A) activity of buller steers

Authors

M.P. Epp
Dale A. Blasi
B.J. Johnson
J.P. Kayser
David M. Grieger

Keywords

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

Abstract

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.

Recommended Citation

Epp, M.P.; Blasi, Dale A.; Johnson, B.J.; Kayser, J.P.; and Grieger, David M. (2004) "Steroid hormone profiles and brain monoamine oxidase type A (MAO-A) activity of buller steers," Kansas Agricultural Experiment Station Research Reports: Vol. 0: Iss. 1. https://doi.org/10.4148/2378-5977.1632