Title (eng)

Bacterial diversity in semen from stallions in three European countries evaluated by 16S sequencing


Pongpreecha Malaluang   Swedish University of Agricultural Sciences / Mahasarakham University

Jane M. Morrell   Swedish University of Agricultural Sciences

Christine Aurich   University of Veterinary Medicine Vienna

Antonio Rocha   University of Porto

Tiago Guimaraes   University of Porto

Christina Nagel   University of Veterinary Medicine Vienna

Yongzhi Guo   Swedish University of Agricultural Sciences

Adnan Niazi   Swedish University of Agricultural Sciences / Uppsala University



Description (eng)

The microbiome plays a significant role in shaping the health and functioning of the systems it inhabits. The seminal microbiome of stallions has implications for the health of the reproductive tract, sperm quality during preservation and antibiotic use in semen extenders. Diverse bacteria are present on the external genital tract and a mix of commensal microorganisms populates various parts of the reproductive tract, influencing the seminal bacterial content. Other sources of bacteria include the environment, semen collection equipment, and personnel. The bacterial load can adversely affect sperm quality and fertility, particularly in artificial insemination, where semen is extended and stored before use. Antibiotics are frequently used to inhibit bacterial growth, but their effectiveness varies depending on the bacterial strains present. The aim of this study was to assess the bacterial diversity in semen from 37 healthy stallions across three European nations (Germany, Portugal, and Sweden) using 16S sequencing. Semen samples were collected from individual stallions at three AI centers; DNA extraction, sequencing, and bioinformatic analysis were performed. Differences in bacterial diversity among the stallions were seen; although bacterial phyla were shared across the regions, differences were observed at the genus level. Climate, husbandry practices, and individual variability likely contribute to these differences. These findings underscore the importance of tailoring antibiotic strategies for semen preservation based on regional bacterial profiles. The study presents a comprehensive approach to understanding the intricacies of the stallion seminal microbiome and its potential implications for reproductive technologies and animal health.

Object languages





Creative Commons License
This work is licensed under a
CC BY 4.0 - Creative Commons Attribution 4.0 International License.

CC BY 4.0 International



Animals; Male; Horsesmicrobiology; Semenmicrobiology; Bacteriaisolation & purificationclassificationgenetics; RNA, Ribosomal, 16Sgenetics; Microbiota; Sweden; Portugal; Germany

Member of the Collection(s) (1)

o:605 Publications / University of Veterinary Medicine Vienna