Hassen Abate, Wasihun, Nazif Amza, Sisaynesh Gudeta, and Abegaz Beyene. 2020. “Substitution Effect of Soybean Meal (glycine Max) With Different Level of Dried Water Velvet (Azolla Pinnata) Meal on Egg Production and Egg Quality Parameter of Potchefstroom Koekoek Layer”. Global Journal of Animal Scientific Research 8 (1), 104-14. http://www.gjasr.com/index.php/GJASR/article/view/35.