Figure 1: (a) Yak and cows’ milk (b) Yak and cows’ colostrum: Concentration of IgG and LF in liquid whey supernatant from yak and cows’ milk as well as colostrum respectively after centrifugation. a,b,cDifferent superscripts within one protein type in both graphs indicate significant difference between different source (P < 0.05). Each value is the average of 20 samples determinations, error bars indicates standard errors.