A 12-year-old Thoroughbred mare just moved to a barn that has a stallion. The owner has noted new behavior (see image) and is concerned.
What do these signs demonstrate?
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These are classic signs of estrus in the mare, including raising the tail, everting the vulva to expose the clitoris (called “winking”), urinating, and abducting the hind legs.
These signs are brought on by exposure to a stallion.
Mares in diestrus generally kick, squeal, and show animosity towards a stallion.