Question: predicting when a mare will foal?
Answer: The visual signs of a mare's readiness to foal are: Udder distension begins 2-6 weeks prior to foaling. Relaxation of the muscles of the croup 7-19 days prior to foaling; relaxation around the tail head, buttocks, and lips of the vulva. Teat nipples fill 4-6 days prior to foaling.