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Metagenomic characterisation of ruminal bacterial diversity in buffaloes from birth to adulthood using 16S rRNA gene amplicon sequencing.
Functional & Integrative Genomics 2018 October 25
Microbial colonisation in the forestomach of a ruminant is one of the most crucial factors in determining many of its physiological developments and digestive capabilities. The present study attempts to identify establishment pattern of microbes in relation to food, age and rumen development in the buffalo calves at every fortnight interval from birth to 6 months of age, followed by every month till animals became 1 year of age. Diversity study based on 16S rRNA gene sequencing identified rapidly changing bacterial population during initial 60 days of life, which got assemblage as rumen became physiologically mature with increasing age of animals. A lactate fermenting aerobic to facultative anaerobic genera found during initial 30 days of life were expeditiously replaced by strict anaerobic cellulolytic bacterial population with increasing age. The study confirms that initial colonisation mainly depends on the oral cavity and skin of the mother, followed by the surrounding environment and feed offered, which is reversed in order once animal gets older. Some of the well-described genera based on culture-dependent studies like Ruminococcus spp. were found to be in lesser proportion suggesting an additional role of other microbes or niche in cellulose degradation. We report the presence of Porphyromonas spp. and Mannheimia glucosidal for the first time in bovine infants.
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