This is a new one for me. Has anyone else ever had a filly born with a swollen udder from which you can express milk (or at least a white substance)? The filly seems normal otherwise. My vet has suggested it's related to the mare's hormone's pre-foaling but he's never seen it before either.
This does sometimes happen, and your vet is correct in his/her supposition of the relationship to the mare's hormones. One thing to be aware of (not alarmed about, just aware of! ) is to watch the filly to make sure that the udder reduces in size and she does not develop mastitis. Most will reduce just fine, but it's good to be aware of the possibilities - forewarned is forearmed...
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