Effect of exercise on scrotal surface temperature in the stallion.

This research paper investigates how exercise influences the scrotal surface temperature (SST) in stallions, with additional evaluation of the effects of the suspensory support system. The study found that exercise significantly impacts SST, with the presence of suspensory generally causing an increase in SST.

Study Objective and Introduction

• The overarching objective of the study was to gain insight into the effect of exercise on scrotal surface temperature (SST) in the stallion, with an added investigation into the impact of the suspensory. As highlighted in the introduction, controlling the temperature of the testes lower than the body temperature is crucial for the normal process of spermatogenesis. This temperature regulation is typically maintained through muscular contractions of the tunica dartos, activity of the scrotal sweat glands and the operation of the arterio-venous counter current heat exchange mechanism at the pampiniform plexus. The researchers set out to understand whether exercise, which is known to elevate core body temperature, also influences SST. The effects of an added suspensory were also evaluated.

Significance of the Study

• Prior studies have established that increased intra-testicular temperature can negatively affect spermatogenesis, leading to a decline in the health and functionality of spermatogenic cells. In horses, heavy exercise has been shown to considerably increase core body temperatures. However, no existing data evaluates whether this increased body temperature from exercise also affects the SST. Therefore, the significance of this study lay in bridging this gap in knowledge and clarifying whether SST is influenced by exercise and how this could impact spermatogenesis in the stallion.

Research Approach and Findings

• The research strategy consisted of exercising stallions on a treadmill and through riding. Evaluations were conducted both with and without the use of suspensory. The findings indicated that exercise significantly affected SST. Furthermore, the use of suspensory generally led to an increase in SST. The research also suggested that air circulation around the scrotum is essential for testicular thermoregulation, as deduced from SST measurements in stallions that were exercised both on a treadmill and through riding.