Bertan, Claudia Maria, Mario Binelli, and Ed Hoffmann Madureira. 2006. “Estrous Characterization in Cross-Bred Heifers (Bos Taurus Indicus X Bos Taurus Taurus) by Radiotelemetry”. Brazilian Journal of Veterinary Research and Animal Science 43 (6): 816-23. https://doi.org/10.11606/issn.1678-4456.bjvras.2006.26562.