I've mixed raw and p&h milks before. When I used 1/2 raw and half p&h I had a 13% yield (making gouda.) When I use all raw I have an 18% yield. I save about $2/gal using p&h but I would rather have the cheese than the $$! My raw milk comes from Normande cows. However, for a few months during winter I must use all p&h or not make cheese at all; at that point, I welcome any milk!
Christine