Urzúa González, Ernesto, Luis Ángel Valdés Pérez, Agustín Garza, Gabriela Mapes, Carlos G Gutiérrez, y Joel Hernández-Cerón. 2017. «Pregnancy Rate in Dairy Cows Treated With Human Chorionic Gonadotropin Five Days After Insemination». Austral Journal of Veterinary Sciences 49 (2):119-22. https://doi.org/10.4067/S0719-81322017000200119.