I have not seen blood in the milk, but someone who takes some of my doe's milk said there was something in one of the bottles that looked like blood. Keep in mind - she pours it into her own small neck quart bottles (ones that hold juice and have a small neck) using her own funnel from home. If there WAS blood in the milk, wouldn't I have seen it when I milked or filtered or bottled it? I am having a hard time seeing how I could have missed that. She's not upset, but I am! Ok, not really upset, but I don't want to overlook a quality control issue if there is one.