Total genomic DNA was extracted from all fecal samples using the PowerSoil® DNA Isolation Kit (MO BIO, USA) following the manufacturer’s instructions. PCR was then performed to amplify the V3-V4 variable region of 16S rRNA gene. The 16S amplicon library was constructed using the TruSeq® DNA PCR-Free Sample Preparation Kit (Illumina, USA) and sequenced on an Ion S5TM platform at Zhejiang Institute of Microbiology (Hangzhou, China).
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