Chemical Composition of Milk and Rumen Microbiome Diversity of Yak, Impacting by Herbage Grown at Different Phenological Periods on the Qinghai-Tibet Plateau

Chemical Composition of Milk and Rumen Microbiome Diversity of Yak, Impacting by Herbage Grown at Different Phenological Periods on the Qinghai-Tibet Plateau

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To estimate how native herbage of three different phenological periods modify rumen performance and milk quality of yak grazing alpine meadow.In this study, milk composition and the diversity of the rumen microbial community were measured in 12 full-grazing female yaks Light Up Picture Frame on the Qinghai-Tibet Plateau (QTP).The nutrient composition of three phenological periods was determined: Vegetative stage (VS), bloom stage (BS), and senescent stage (SS).High-throughput sequencing of the bacterial 16S rRNA gene was used.

The results showed that crude protein (CP) content of herbage in BS was higher than that in vs.and SS (p p p p p p p Desulfovibrio, Prevotella_1, and Butyrivibrio_2 and was negatively correlated with Olsenella, Ruminococcaceae_UCG.010, and Rikenellaceae_RC9_gut_group abundances.Collectively, the results revealed that there were significant differences in nutrient composition of herbage, chemical composition of yak milk, and microbial diversity in rumen at different phenological stages.

The correlations between ruminal fermentation parameters, chemical constituents of yak milk, and some genera of ruminal bacteria might be indicative that the ruminal fermentation parameters and chemical constituents of yak milk are strongly influenced Mains Terminal Strip by the rumen bacterial community composition.