Hidalgo V., Y., Velásquez V., C., Chagray A., N., Llapapasca G., N., & Delgado C., A. (2018). Relationship between two methods of heat detection and reproductive efficiency in Holstein cows. Revista De Investigaciones Veterinarias Del Perú, 29(4), 1364-1371. https://doi.org/10.15381/rivep.v29i4.15388