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Description: This stallion (bay) is approaching the mare's (pinto) head to 'tease' her from behind the wall. He will nuzzle the mare to test whether the mare is in heat (estrus). A mare in heat is receptive to the stallion, indicating that she will stand to be mounted and bred. This information can help determine the mare's optimal time for breeding. A good teasing stallion should be enthusiastic and assertive without being aggressive or rough. Commonly, a mare in estrus may nuzzle the stallion with her ears cocked in his direction and her tail raised and lifted away from him. Additional signs of heat can include squatting, body arching, fence pushing, urinating and vulvar winking (eversion of the vulvar lips). A mare in heat may demonstrate various combinations of these signs, but seldom all of them.