Bonato, Gabriela Lucia, et al. “Estrotect® Efficiency in Identifying Estrus in Crossbred Dairy Cows”. Brazilian Journal of Veterinary Research and Animal Science, vol. 49, no. 1, Feb. 2012, pp. 19-23, https://doi.org/10.11606/issn.2318-3659.v49i1p19-23.