Ezema, C.; Eze, D. C. Probiotic Effect of Yeast (Saccharomyces Cerevisiae) on Hen-Day Egg Performance, Serum and Egg Cholesterol Levels in Laying Chicken. Pak. J. Nutr. 2014, 14 (1), 44–46. https://doi.org/10.3923/pjn.2015.44.46.