Effect of Gender Bias on Equine Fecal Microbiota.

The research article is an exploration of gender-based differences in the intestinal microbiota of Przewalski’s horses, a type of wild horse. It found that gender did significantly alter the dominant microbial communities, with male horses showing higher levels of potentially disease-related microorganisms.

Study Objectives and Method

• The researchers set out to determine if gender plays a role in shaping the intestinal microbiota of Przewalski’s horses, a species of wild horse. They sought to fill the knowledge gap, as no previous studies had documented whether there are gender-related differences in the intestinal microbiota of equines.
• To explore the microbial community, the researchers analyzed fecal samples from seven female Przewalski’s horses (FRPHs) and seven male Przewalski’s horses (MRPHs).
• Their analysis was carried out using 16S rRNA sequencing, a common technique used to identify and compare bacteria present in a sample. Following the sequencing, they conducted a diversity analysis and difference analysis.

Findings

• The study found that the females demonstrated higher Shannon diversity than the males. Shannon diversity is a measure of species diversity within a community, taking into account both abundance and evenness of the species present.
• However, there was no notable difference detected in Simpson diversity between the genders. Simpson diversity is another measure of diversity that places more emphasis on the most abundant species.
• In terms of beta diversity, which compares the diversity between different ecosystems (in this case, the gastrointestinal tracts of male and female horses), a significant difference was found.
• The researchers observed that while gender had a minimal effect on the overall composition of the microbiota, it did significantly alter the dominant microbial communities at each level of classification.
• The male horses showed significantly higher levels of spirochetes, deltaproteobacteria, fibrobacteria, spirochaetia, desulfovibrionales, fibrobacterales, spirochaetales, and spirochaetaceae – microorganisms related to various diseases.
• Meanwhile, the top 10 genera contained fewer organisms in the female horses compared to the male horses.

Significance of the Study

• The research provides the first documentation of gender-related differences in the intestinal microbiota profiles in equines, an area that had not previously been studied.
• The study’s findings suggest that gender should be considered a significant biological variable when conducting future microbiota studies. Considering this variable might lead to improved knowledge about disease susceptibility and health differences between male and female horses.