Mussabekov, A. ., D. . Yermakhan, M. . Maulenkulova, and A. . Bekzhankyzy. “The Effectiveness of Yeast Additives Added to the Diet When Fattening Bulls”. Scientific Journal of Animal Science, vol. 10, no. 1, Jan. 2022, pp. 712-5, http://sjournals.com/index.php/sjas/article/view/1666.