Take a second look

A mare is exhibiting behaviour - but is tricky it her oestrus, or does something else lie behind it? Adam Jackson MRCVS explains what may be the root cause

MARES are often wonderful to own as they can be loving, and enjoy company and attention. However, caring for a mare can be difficult at times. Unpredictable and erratic behaviour, which may interfere with a mare's performance, training and management, can be frustrating for owners.

Many people think that such behaviours are associated with the mare's oestrus cycle, but in fact they may be due to other problems entirely. It is important to talk to and work with your vet to find the root of such behaviour, so that it may be addressed in a positive way.

The mare's reproductive cycle

A MARE'S oestrus cycle usually occurs from May to October with roughly seven days of oestrus (heat) and 14 of dioestrus (not in heat). There is anecdotal evidence that cycling is beginning earlier; this may be related to unusual, inconsistent weather. The ovaries become smaller and inactive from autumn to early spring; then the mare's behaviour alters as no hormones are released.

It is important to recognise the normal signs of oestrus:
● Frequent urination in small volumes 
● "Winking" (parting the vulva, exposing the clitoris) Being easily distracted by other horses
● Squealing

Although this behaviour may be challenging, we must appreciate that it is normal behaviour.

IS IT HER CYCLE?

IT is essential to distinguish if your mare's behaviour is due to her normal oestrus cycle (see box, below), an abnormal oestrus cycle or another issue.