Saeed ن. ع., and Mofarrerh م. م. “The Effect of Cutting Time on Forage and Crud Protein of Alfalfa Cultivars Yield (Medicago Sativa L.) Dhamar- Yemen”. University of Aden Journal of Natural and Applied Sciences, vol. 24, no. 2, Oct. 2020, pp. 309-17, doi:10.47372/uajnas.2020.n2.a01.