She stands quietly with tail raised and allows him to mount her. There is a normal variation among mares in the interval between ovulations - 14 to 28 days. No one animal will have constant intervals. Lactation - to stimulate Some owners advocate preparing the pregnant mare for suckling by massaging her udder and stroking the inside of her thighs, over a 3 to 4 week period before birth. This makes her more receptive to the foal, especially if it is her first.
More milk is provided and more produced.
This applies to a stallion who has been shown to be fertile but does not mate. He may be discouraged by a non-receptive mare or not responsive to a receptive one. The problem is usually one of confidence, which responds to skilled management. This must be proven against a mare of known fertility. Given adequate food, male infertility may be due to a general infection or some abnormality in the male system.