Prepartum vaginal microbiota and postpartum uterine microbiota in cows

  • Ali Bazzazan Department of Clinical Sciences, Faculty of Veterinary Medicine, University of Montréal, Saint-Hyacinthe, Quebec, Canada
  • Marcio Costa Department of Biomedical Sciences, Faculty of Veterinary Medicine, University of Montréal, Saint-Hyacinthe, Quebec, Canada
  • Mariela Segura Research Group on Infectious Diseases in Production Animals, and Swine and Poultry Infectious Diseases Research Centre, Faculty of Veterinary Medicine, University of Montréal, Saint-Hyacinthe, Quebec, Canada
  • Réjean Lefebvre Department of Clinical Sciences, Faculty of Veterinary Medicine, University of Montréal, Saint-Hyacinthe, Quebec, Canada
DOI: https://doi.org/10.58292/CT.v17.10988
Keywords: Microbiota, dairy cows, vagina, uterus

Abstract

Postpartum uterus clears bacteria within 6 weeks; however, up to 40% of dairy cows cannot eliminate uterine infection. Culture-independent approaches based on the analysis of the 16S rRNA gene indentified reduced richness and diversity in the reproductive tract of cows with endometritis. Goal was to characterize the vaginal microbiota before calving and the uterine microbiota after calving in cows that had or not developed endometritis. We compared the results of DNA sequencing with conventional culture methods in uterine samples collected 21 days after calving. Vaginal samples (via cytobrush) from multiparous cows (n = 61) were obtained 1 week before calving (-1w) and uterine samples 1 week (+1w), 3 weeks (+3w), and 5 weeks (+5w) after calving. Samples of healthy cows (n = 11) and cows with endometritis (n = 11) were selected for DNA extraction and 16S rRNA sequencing. Richness and diversity measures in the uterine microbiota were not different between healthy and diseased groups (Chao p = 0.17, Simpson p = 0.29) at -1w, +1w and +5w. Uterine microbiota composition differed (p = 0.03) between groups only at 3 weeks after calving. Diseased cows had a lower relative abundance of Firmicutes and Bacteroidetes and a higher abundance of Actinobacteria than healthy cows. Bacteria that grew in culture were often represented within the most abundant bacterial genera in the DNA sequencing 3 weeks after calving.

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Published
2025-02-13
How to Cite
Bazzazan A., Costa M., Segura M., & Lefebvre R. (2025). Prepartum vaginal microbiota and postpartum uterine microbiota in cows. Clinical Theriogenology, 17. https://doi.org/10.58292/CT.v17.10988
Issue
Vol. 17 (2025): Issue in progress
Section
Research Reports
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