Mohamed Gaafar, H., and R. Mesbah. “Composition and In Vitro Gas Production Evaluation of Corn Silage Cultivated at Twenty and Thirty Thousand Plants Per Feddan ”. Global Journal of Animal Scientific Research, Vol. 8, no. 3, Nov. 2020, pp. 14-31, http://gjasr.com/index.php/GJASR/article/view/51.