Studies reported that the mixed yogurt culture, L. bulgaricus and S. thermophilus, appeared unaffected by the addition of prebiotics during cold storage, although a slight but not significant (p < 0.05) increase in cell concentration was observed with the addition of prebiotics (Vasiljevic, Kealy, & Mishra, 2007). Another study showed that the addition of prebiotic had a substantial positive effect on the performance of selected Lactobacillus strains