Breed again if ovulation does not occur by 48 hours. This requires assistance from your veterinarian in predicting ovulation time and confirming ovulation occurrence. Rectal palpation of the ovaries and sometimes ultrasound examination are necessary for this response. The great majority of twins are aborted before they are born, or fail to develop into viable foals. Modern ultrasound technology and skillful manual dexterity by your veterinarian allow early detection of twins and reduction to a single pregnancy.
Emphasis here is on the word early.
Results of reduction are much better before 20 days, and the process is much easier on the mare. About The Author Dr. A. C. Asbury retired to Versailles, Ky., after a practice and academic career devoted to equine reproduction.