Glucocorticoid assessment in the domestic horse: The impacts of time and climatic variables on sample integrity.

The research article investigates how different environmental conditions can impact the levels of faecal glucocorticoid metabolites (FGM) – stress hormones – in horse faeces and therefore the accuracy of stress monitoring in horses.

Research Objectives:

• The purpose of this study was to analyze the effects of various climates and time conditions on the concentration of FGM in equine faeces.
• The research aims to improve the process and dependability of stress assessment in domestic horses.

Methods:

• The research was conducted as an in vitro experiment, using controlled environmental conditions to imitate a mix of weather and seasonal patterns.
• The conditions included a temperate climate, high heat, a combination of high heat and rainfall, a mix of temperate climate and rainfall, fluctuation between high heat and temperate climate, and a freeze/thaw cycle. These conditions were maintained over a five-day period.
• Enzyme-linked immunoassay, a laboratory technique used to measure antigens (molecules capable of inducing an immune response) in biological samples, was used to quantify FGM in the faecal samples.

Results:

• The research found that when exposed to room temperature and high heat, the FGM levels in the faecal samples significantly increased over time.
• In contrast, the FGM levels in the faecal samples showed no change when subjected to other environmental conditions.

Conclusions and Recommendations:

• The researchers recommend duplicating the study in the field and with known high and low concentrations of FGM to provide more insight into the optimal sampling routines.
• The study concluded that when monitoring the adrenal activity in horses, it’s crucial to take into account the impact of climate on the integrity of faecal samples to better inform sampling schedules and enhance the reliability of the results.