Love this site-thanks to everyone for your kindness and conviction!! About 2 weeks ago I noticed a brownish-red sediment in the bottoms of my milk jars after they had sat in the fridge for a couple of days. My husband is the most comitted to drinking it and said it had an off taste even before I told him about the rings. SO...I called the vet to make sure we didn't treat for mastitis unneccesarily. Both of the mastitis tests that my vet ran came back negative. But he says that it looks like blood and recommended that we treat with vitamin K for 5 days. She does have a dry sister that we sometimes put with her, but noone has horns. Has anyone heard of this bleeding into the udder? Is it genetic? What does the vitamin K do? Thanks!!