U. M Kolo, et al. “Haematogical Indices and Serum Biochemistry of Sheep Fed a Concentrate Diet Supplemented With Graded Levels of Exogenous Enzyme in the Semi-Arid”. Global Journal of Science Frontier Research, vol. 19, no. D3, Mar. 2019, pp. 13-18, https://journalofscience.org/index.php/GJSFR/article/view/2528.