Kozicki, Luiz Ernandes, Luis Carlos Woellner, Flávia Kazumi Shibata, and Marcelo Alves da Silva. 1998. “A Field Study of Postpartum Period of Dairy Cows by Rectal Palpation and Progesterone Profiles in the Milk by Radioimmunoassay”. Brazilian Journal of Veterinary Research and Animal Science 35 (5): 228-28. https://doi.org/10.1590/S1413-95961998000500008.