D. Cáceres Bautista and E. M. Mogollón W, “Factors that hinder artificial insemination in sheep and its impact on fertility, pregnancy and parturition rates: : systematic literature review”, Spei domus, vol. 13, no. 26-27, pp. 1–13, Aug. 2020, doi: 10.16925/2382-4247.2017.01.05.