Journal of Microbiology

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Understanding the Diversity and Roles of the Ruminal Microbiome: Gi Beom Keum, Sriniwas Pandey, Eun Sol Kim, Hyunok Doo, Jinok Kwak, Sumin Ryu, Yejin Choi, Juyoun Kang, Sheena Kim, Hyeun Bum Kim; J. Microbiol. 2024;62(3):217-230. Published online April 25, 2024; DOI: https://doi.org/10.1007/s12275-024-00121-4

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The importance of ruminal microbiota in ruminants is emphasized, not only as a special symbiotic relationship with ruminants but also as an interactive and dynamic ecosystem established by the metabolites of various rumen microorganisms. Rumen microbial community is essential for life maintenance and production as they help decompose and utilize fber that is difcult to digest, supplying about 70% of the energy needed by the host and 60–85% of the amino acids that reach the small intestine. Bacteria are the most abundant in the rumen, but protozoa, which are relatively large, account for 40–50% of the total microorganisms. However, the composition of these ruminal microbiota is not conserved or constant throughout life and is greatly infuenced by the host. It is known that the initial colonization of calves immediately after birth is mainly infuenced by the mother, and later changes depending on various factors such as diet, age, gender and breed. The initial rumen microbial community contains aerobic and facultative anaerobic bacteria due to the presence of oxygen, but as age increases, a hypoxic environment is created inside the rumen, and anaerobic bacteria become dominant in the rumen microbial community. As calves grow, taxonomic diversity increases, especially as they begin to consume solid food. Understanding the factors afecting the rumen microbial community and their efects and changes can lead to the early development and stabilization of the microbial community through the control of rumen microorganisms, and is expected to ultimately help improve host productivity and efciency.

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