Yousefi, M.; Karkoodi, K. Effect of Probiotic Thepax® And Saccharomyces Cerevisiae Supplementation on Performance and Egg Quality of Laying Hens. Int. J. Poult. Sci. 2006, 6 (1), 52–54. https://doi.org/10.3923/ijps.2007.52.54.