Dynamics of the acute uterine response to infection, endotoxin infusion and physical manipulation of the reproductive tract in the mare.

The study observes the immediate response of the uterus to different types of stimulations such as infection, endotoxin infusion and physical manipulation in horses. Significantly, no observable difference was found between horses resistant or vulnerable to infection in terms of protein or white blood cell concentration. However, it was noticed that vaginal stimulation did not trigger the defense mechanisms of the uterus as opposed to the cervix and uterus stimulation.

Methodology

• The researchers examined the uterine response after infusing saline (PBS), bacterial suspension, or a lipopolysaccharide coming from Escherichia coli bacterium.
• They also separately observed the response after causing physical stimulation in the reproductive tract.

Findings

• All types of infusions triggered a response that involved both serum proteins and leucocyte (a type of white blood cell).
• The protein levels rose and peaked within a few hours after infusion.
• On the contrary, leucocyte concentration reached its peak later, around 6 hours after the infusion.
• In terms of bacterial recovery, a steep drop was noted after 12 hours from the uterus.
• In horses known to be susceptible to infection, large quantities of bacteria were again recovered after a 24-hour interval.

Comparison of Resistant and Susceptible Horses

• The researchers found no discernable difference in terms of protein or leucocyte concentration, between horses resistant or susceptible to infection.

Physical Stimulation of Reproductive Tract

• Stimulation of the cervix and uterus resulted in a reaction involving protein and neutrophil (a type of leucocyte).
• However, vaginal stimulation did not trigger similar uterine defenses as observed in cervix and uterus stimulation.

Conclusion

• The research is significant in enhancing our understanding of how a mare’s uterine response varies due to different types of stimuli. It provides an insight into the characteristics and scheduling of immediate reactions, including any potential difference between infection-resistant and susceptible horses.
• These findings may eventually contribute to more effective prevention and treatment of uterine infections in horses, further optimizing reproductive health and longevity.