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Techno-functional characterization of fecal lactobacilli isolates of Bos indicus calves for probiotic properties

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Abstract

In this study, 105 bacterial colonies were isolated from the feces of newborn healthy Bos indicus calves and 37 isolates were confirmed using morphological, biochemical tests, and genus-specific PCR as lactobacilli. 11 isolates were then short-listed for in vitro probiotic testing based on their ability to dwell under acid and bile stress. Species-level identification using 16S rRNA gene sequencing revealed that they were Ligilactobacillus salivarius. These isolates flourished in 0.4% phenol, depicting resistance in adverse conditions encountered in the gastrointestinal tract. The results of cell surface hydrophobicity were found to be 74.50% for RBL12 and 62.62% for RBL09 in hexadecane and xylene, respectively, and that of auto-aggregation was highest in RBL26 (58.92%). These isolates also produced digestive enzymes like amylase, protease, and β-galactosidase. Further assays reiterated their antimicrobial and coaggregation potential against diarrhea-causing pathogens like Escherichia coli ATCC-25922 and Salmonella arizonae ATCC-13314. Biosafety assessment revealed that none of the tested isolates were hemolytic and mucinolytic in nature. Furthermore, the antioxidant potential of the isolates was also confirmed using 1,1‑diphenyl‑2‑picrylhydrazyl (DPPH) and ferric ion-reducing antioxidant power (FRAP) assay. Along with efficient utilization of inulin, isolates showed promising adhesion ability to the HT-29 cell line. The current findings hence conclude that these Lactobacillus isolates can be exploited as animal probiotics for potential application in young calves to foster gut health and immunity.

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All data generated or analyzed during this study are included in this published article [and its supplementary information files].

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Acknowledgements

The authors would like to express their sincere gratitude to Director, ICAR-NDRI, Karnal, for providing all the necessary facilities to carry out the research work.

Funding

This work was supported by grants from ICAR-NCVTCC, Hisar, India (F.No: NCVTC/Budget/2019–20/860).

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Contributions

RC: Writing ‐ review & editing, Methodology. SK: Conceptualization, Funding acquisition, Project administration, Writing ‐ review & editing, Formal analysis. BK: Writing – review & editing, Software. MB: Methodology, Formal analysis. VV: Writing ‐ review & editing, Software. NT: review the manuscript. RHM: Conceptualization, Formal analysis, Software. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Sachin Kumar.

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The authors declare no competing interests.

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The experiments were done in compliance with appropriate rules and guidelines laid down by the Institutional Animal Ethics Committee (IAEC) registered (Registration number: 1705/GO/ac/13/CPCSEA) Committee for the Purpose of Control and Supervision of Experiments in Animals (CPCSEA), New Delhi, Ministry of Environment, Forests and Climate Change, Government of India.

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Supplementary Information

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11259_2023_10077_MOESM1_ESM.jpg

Supplementary file1 Survivability percentage of lactobacilli isolatesexposed to acid (pH 2) and bile (Ox-bile 0.3%); Values are mean ± S.E.M. ofthree replicates (JPG 29 KB)

Supplementary file2 Matrix plot of CSH (%) hexadecane, CSH (%) xyleneVs auto aggregation  (JPG 28 KB)

Supplementary file3  Mucin degradation assay of the isolates (JPG 1151 KB)

Supplementary file4 (DOCX 24 KB)

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Chouraddi, R., Kumar, S., Kumar, B. et al. Techno-functional characterization of fecal lactobacilli isolates of Bos indicus calves for probiotic properties. Vet Res Commun 47, 1285–1302 (2023). https://doi.org/10.1007/s11259-023-10077-2

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  • DOI: https://doi.org/10.1007/s11259-023-10077-2

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