Fraire-Cordero, Silvia, et al. “Reproductive Response of Pelibuey Sheep to the Application of Recombinant Bovine Somatotropin and a Metabolic Restorative Preparation”. Pesquisa Agropecuaria Brasileira, vol. 53, no. 12, Dec. 2018, pp. 1392-8, doi:10.1590/S1678-3921.pab2018.v53.26424.