This depends on the type of anestrus. Most cases of prolonged corpus luteum function can be treated with the hormone prostaglandin. Winter anestrus is not as easy to treat. Light therapy is best starting out in late November or early December. Mares should be put on 16 hours of light. One method is to place mares in a 12 x 12 foot box stall lit with a 200-watt incandescent bulb. Other methods are to put in paddocks that are lighted. The amount of light is adequate when you can read a newspaper with your back to the light source in the farthest most corner of the paddock. Hormone treatments have been developed to induce estrous cycles in the anestrous mare. Mares are treated with gonadotropin-releasing hormone to mimic the changes in FSH and LH during a normal cycle. Continuous infusion, pulsatile infusion, implants and twice daily injections can initiate follicular growth and ovulation in the absence of photoperiodic stimulation. Normal corpus luteum function follows the treatment.
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