B., Farrag, et al. “Influence of Short- and Long-Term Administration of Melengestrol Acetate on Estrus Activity and Reproductive Performance of Nulliparous Barki Ewes.” International Journal of Environment, Agriculture and Biotechnology, vol. 3, no. 4, 2018, pp. 1276–84. Crossref, https://doi.org/10.22161/ijeab/3.4.19.