Concentrate supplementation improves cold-season environmental fitness of grazing yaks: responsive changes in the rumen microbiota and metabolome

作者：Simeng Yi, Hao Wu, Yue Liu, Dongwen Dai, Qingxiang Meng, Shatuo Chai, Shujie Liu, Zhenming Zhou · 发表于：Frontiers in Microbiology · 年份：2023 · DOI：10.3389/fmicb.2023.1247251 · 被引用次数：26 · 研究领域：Ruminant Nutrition and Digestive Physiology、Gout, Hyperuricemia, Uric Acid、Turfgrass Adaptation and Management

Yak ( Bos grunniens ) is an important economic animal species on the Qinghai-Tibet Plateau. Yaks grazed in the cold season often suffer from nutritional stress, resulting in low production performance. This situation can be improved by properly feeding the grazing yaks in the cold season; however, there is still little information about the effect of different feeding levels on the intestinal microflora and metabolites of yaks. Therefore, this study aimed to explore the effect of feeding different doses of concentrate supplements on rumen bacterial communities and metabolites in grazing yaks during the cold season. Feed concentrate supplementation significantly improved the production performance and rumen fermentation status of grazing yaks during the cold season, and switched the type of ruminal fermentation from acetic acid fermentation to propionic acid fermentation. Ruminal fermentation parameters and ruminal bacterial abundance correlated strongly. At the phylum level, the abundance of Firmicutes increased with increasing concentrate supplementation, while the opposite was true for Bacteroidota . At the genus level, the abundance of Christensenellaceae_R-7_group , NK4A214_group , Ruminococcus , norank_f__Eubacterium_coprostanoligenes_group , norank_f__norank_o__ Clostridia_UCG-014 , Lachnospiraceae_NK3A20_group , Acetitomaculum , and Family_XIII_AD3011_group increased with increasing concentrate supplementation, while the abundance of Rikenellaceae_RC9_gut_ group decrea...