Body weight and fecal score of TGEV-infected piglets. Piglets fed with Znlow, Znmed and Znhigh were orally infected with TGEV. (A) Body weight was recorded at given time points and (B) fecal scores (from 1 to 5, where 1 means watery and 5 hard and dry stool) were recorded daily after infection. Boxes indicate medians (n = 10) (horizontal lines) and the lower and upper quartiles (bottoms and tops of the boxes). The vertical bars in the box plots indicate the minimal and maximal values recorded. Asterisk indicates statistically significant difference (p ≤ 0.05) between the groups.