Abstract
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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Data availability
All data generated or analysed during this study are included in this published article as supplementary information files. In addition, the datasets generated and analysed during the current study are available in the MG-RAST. The following link can be used by the reviewer to access data as a part of data share at MG-RAST. The data will be made publically available once paper will be accepted.
Abbreviations
- NGS:
-
next-generation sequencing
- VFA:
-
volatile fatty acid
- CP:
-
crude protein
- EE:
-
ether extract
- 0D:
-
zero day
- MG-RAST:
-
metagenome rapid annotation using subsystem technology
- PAST:
-
paleontological statistics
- PCoA:
-
principal coordinates analysis
- PLS-DA:
-
partial least squares-discriminant analysis
- TSV:
-
tab separated value
- STAMP:
-
statistical analysis of metagenomic profiles
- OUT:
-
operational taxonomic units
- PC:
-
principal component
- Fr:
-
French gauge
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Acknowledgements
We are thankful to the Indian Council of Agricultural Research for providing financial support under Niche Area of Excellence Programme (Grant Letter F. No. 10 (2)/2011-EPD). We thank Dr. Ghanshyambhai Patel for providing excellent technical assistance in sample collection, maintaining animals and collecting nutritional data at Animal Nutrition Research Station, Anand Agricultural University, Anand, Gujarat, India.
Funding
All the funding for the current research work was provided by Indian Council of Agricultural Research under Niche Area of Excellence programme wide NO. ICAR letter No. 10(2)/2011-EPD dated 15-07-2014 under research project entitled “Metagenomic analysis of ruminal microbes”.
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PGK conceptualised the project, participated in sample collection and drafted the manuscript; JRT performed DNA extraction, amplicon generation and data analysis; RJP assisted in data analysis; ATH assisted technically during experimental study; MJP performed sequencing and generated data on MiSeq; RKS maintained animals and did sample collection; SJJ drafted actual research project and improved manuscript; CGJ conceptualised research idea and provided all facilities to carryout research. All authors read and approved the final manuscript.
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All animal ethics guidelines were followed and complied as per permission from Ethical Committee norms and letter No. IAEC 525-2015.
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None of the authors has any financial or personal relationships that could inappropriately influence or bias the content of the paper. The authors declare no conflict of interest.
Electronic supplementary material
Supplementary Table 1
Details PCR primers used for detection of rumen bacterial species in this study by amplicon generation followed by NGS. (XLSX 8 kb)
Supplementary Table 2
Details of numbers of reads and bases generated for all 19 samples. (XLSX 10 kb)
Supplementary Table 3
Relative abundance of each bacterial taxa at phylum level (> 1% level of abundance) as well as ratio of Bacteriodetes:Firmicutes (XLSX 19 kb)
Supplementary Table 4
Relative abundance of each bacterial taxa at genus level (> 1% level of abundance) among seven groups consist of a total 19 samples collected at different age. (XLSX 72 kb)
Supplementary Table 5
Details of individually shared genera across different age groups. (XLSX 18 kb)
Supplementary Table 6
Relative abundance of each bacterial taxa at species level (> 1% level of abundance) among seven groups consist of a total 19 samples collected at different age. (XLSX 274 kb)
Supplementary Figure 1
Rarefaction analysis for bacterial operational taxonomic units (OTUs) in each sampling. Individual rarefaction curves for each rumen sample taken to evaluate the depth of sequencing for each sample. Each age group is distinguished by different colour of trend lines. (DOCX 1583 kb)
Supplementary Figure 2
This figure shows the relative abundance of each bacterial taxa at phylum level. X-axis, samples from different age; Y-axis, the relative abundance of bacterial taxa at each phylum level (%). (DOCX 1197 kb)
Supplementary Figure 3
This figures shows the relative abundance of each bacterial taxa at genus level. X-axis, seven age groups consist of a total 19 sampling at different age: Y-axis, the relative abundance of bacterial taxa at each genus level (%). (DOCX 737 kb)
Supplementary Figure 4
PCoA analysis of genus level bacterial composition of ruminal samples taken at different age. PC1, PC2 and PC3 together explains 82% of total variation at genus level composition. It is clearly defined to make seven different groups showing different bacterial composition from all 19 samples collected at different age. (DOCX 420 kb)
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Koringa, P.G., Thakkar, J.R., Pandit, R.J. et al. Metagenomic characterisation of ruminal bacterial diversity in buffaloes from birth to adulthood using 16S rRNA gene amplicon sequencing. Funct Integr Genomics 19, 237–247 (2019). https://doi.org/10.1007/s10142-018-0640-x
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DOI: https://doi.org/10.1007/s10142-018-0640-x