Link to Resource File(s) Roelle et al 2017 WSB_SpayVac as a contraceptive in feral horses.pdf Basic Information Summary or Abstract USGS authors studied efficacy of the PZP vaccine 'SpayVac,' in a captive trial at Pauls Valley facility. Author or Creator Roelle et al Citation Information Publisher or Periodical Journal of Wildlife Management Volume # or Version # 41 Issue # 1 Document ID (DOI#) 10.1002/wsb.729 Available from BLM Library? Yes Source Information Internal/External Usage External Tagging Information BLM Program Wild Horses & Burros