Peña Joya, Miguel A, Agustín Góngora, and Claudia Jiménez. 2012. “Infectious Agents Affecting Fertility of Bulls, and Transmission Risk through Semen. Retrospective Analysis of Their Sanitary Status in Colombia”. Revista Colombiana De Ciencias Pecuarias 24 (4):634-46. https://doi.org/10.17533/udea.rccp.324723.