Yousefi, M. and Karkoodi, K. 2006. Effect of Probiotic Thepax® and Saccharomyces cerevisiae Supplementation on Performance and Egg Quality of Laying Hens. International Journal of Poultry Science. 6, 1 (Dec. 2006), 52–54. DOI:https://doi.org/10.3923/ijps.2007.52.54.