an increasing trendp < 0.10
The relative abundance of Christensenellaceae R-7 group and Ruminococcaceae NK4A214 group showed a linear increase ( p < 0.05) and Ruminococcaceae UCG-014 showed an increasing trend ( p < 0.10) with the dietary energy level increased, while the abundance of Succinivibrionaceae UCG-002 showed a linear decrease ( p < 0.05) and Lachnospiraceae XPB1014 group showed a decreased trend ( p < 0.10) with the dietary energy level increased ( Supplementary Table S3 ).