Fig. 2

a Effects of late gestational HS on the fecal microbial composition at phylum in primiparous sows (relative abundance > 1%). b The statistical analysis of dominant phyla in the feces due to HS (relative abundance > 1%). The values were presented as the medians, with six or five sows per group. Statistical differences between two groups at each day were calculated by the Mann-Whitney U test. HS = heat stress; TN = thermoneutral