Table 2. Partial enriched pathway of differential metabolites.

Pathway ID in KEGG database	Description of pathway	Compounds number
rno01100	Metabolic pathways	46
rno00240	Pyrimidine metabolism	8
rno00520	Amino sugar and nucleotide sugar metabolism	6
rno01230	Biosynthesis of amino acids	5
rno00400	Phenylalanine, tyrosine and tryptophan biosynthesis	4