Rocha, José Lázaro da, Valquiria Hyppolito Barnabe, Renato Campanarut Barnabe, Ed Hoffman Madureira, Claudio Alvarenga de Oliveira, and José Antonio Visintin. 1993. “Progesterone Levels in Fat-Eree Milk of Cows During Post Partum Period and Early Pregnancy Diagnosis”. Brazilian Journal of Veterinary Research and Animal Science 30 (supl.):243-47. https://doi.org/10.11606/issn.1678-4456.bjvras.1993.52039.