Peres, Karen Regina, et al. “Utilization of the First Ovulatory Cycle of Seasonal Breeding for Embryo Production in Mares in Tropical Conditions”. Brazilian Journal of Veterinary Research and Animal Science, vol. 43, no. 2, Apr. 2006, pp. 270-9, https://doi.org/10.11606/issn.1678-4456.bjvras.2006.26509.