Why do mares get moody when they are in season?

Mares can become moody when they are in season due to hormonal fluctuations associated with their estrous cycle. Increased levels of estrogen can lead to behavioral changes, such as irritability or restlessness, as well as physical discomfort. This hormonal shift can affect their mood and interactions with other horses and humans. Additionally, their heightened sensitivity during this time may cause them to react differently to stimuli in their environment.