Core Microbiota for Nutrient Digestion Remained and Ammonia Utilization Increased After Continuous Batch Culture of Rumen Microbiota

Overview

Journal Front Microbiol

Specialty Microbiology

Date 2024 Feb 8

PMID 38328430

Authors

Mengyu Liu

Tong Wang

Lu Wang

Hanjie Xiao

Jinhui Li

Chunhui Duan

Lijie Gao

Yueqin Liu

Hui Yan

Yingjie Zhang

Shoukun Ji

Affiliations

Soon will be listed here.

Abstract

Introduction: This study aimed to investigate the digestive function, urea utilization ability, and bacterial composition changes in rumen microbiota under high urea (5% urea in diet) over 23 days of continuous batch culture .

Methods: The gas production, dry matter digestibility, and bacterial counts were determined for the continuously batch-cultured rumen fluid (CRF). The changes in fermentation parameters, NH-N utilization efficiency, and microbial taxa were analyzed in CRF and were compared with that of fresh rumen fluid (RF), frozen rumen fluid (FRF, frozen rumen fluid at -80°C for 1 month), and the mixed rumen fluid (MRF, 3/4 RF mixed with 1/4 CRF) with rumen fermentation.

Results: The results showed that the dry matter digestibility remained stable while both the microbial counts and diversity significantly decreased over the 23 days of continuous batch culture. However, the NH-N utilization efficiency of the CRF group was significantly higher than that of RF, FRF, and MRF groups ( < 0.05), while five core genera including , , , , and were retained after 23 days of continuous batch culture. The NH-N utilization efficiency was effectively improved after continuous batch culture , and , , , , , , and were identified to explain 75.72% of the variation in NH-N utilization efficiency with the RandomForest model.

Conclusion: Thus, core bacterial composition and function retained under high urea (5% urea in diet) over 23 days of continuous batch culture and bacterial biomarkers for ammonia utilization were illustrated in this study. These findings might provide potential applications in improving the efficiency and safety of non-protein nitrogen utilization in ruminants.

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