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1 July 2013 Evaluation of Bison (Bison bison) Semen from Yellowstone National Park, Montana, USA, Bulls for Brucella abortus Shedding
Rebecca K. Frey, P. Ryan Clarke, Matt P. McCollum, Pauline Nol, Kammy R. Johnson, Brent D. Thompson, Jennifer M. Ramsey, Neil J. Anderson, Jack C. Rhyan
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Abstract

To determine if bison (Bison bison) bulls from Yellowstone National Park (YNP), Montana, USA, shed an infective dose of Brucella abortus in semen, 50 YNP bulls were captured on public lands in Montana during the winter and early spring (April–May) of 2010 and 2011. The bulls were immobilized, and blood and semen samples were collected for serology and Brucella culture. Thirty-five bulls (70%) were antibody-positive, and B. abortus was cultured from semen in three (9%) of the 35 antibody-positive or suspect bulls, though not at concentrations considered an infective dose. Eight bulls (six antibody-positive, two negative) had palpable lesions of the testes, epididymides, or seminal vesicles consistent with B. abortus infection. Breeding soundness exams and semen analysis suggested that antibody-positive bulls were more likely to have nonviable ejaculate (8/35; 23%) than bulls without detectable antibody (2/15; 13%).

Rebecca K. Frey, P. Ryan Clarke, Matt P. McCollum, Pauline Nol, Kammy R. Johnson, Brent D. Thompson, Jennifer M. Ramsey, Neil J. Anderson, and Jack C. Rhyan "Evaluation of Bison (Bison bison) Semen from Yellowstone National Park, Montana, USA, Bulls for Brucella abortus Shedding," Journal of Wildlife Diseases 49(3), 714-717, (1 July 2013). https://doi.org/10.7589/2012-04-118
Received: 23 April 2012; Accepted: 1 February 2013; Published: 1 July 2013
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