The milk doesn't have to be raw — but it must have been cultured with beneficial organisms and then not heated again to get good enough whey. (gnowfglins.com)
Those antibiotics invariably change the species of bacteria and other beneficial organisms (gut flora) that live in your cat's intestine. (2ndchance.info)
I also encourage them to use crop rotation, cover crops, compost, crop diversity, and use practices that support beneficial organisms. (dotearth.blogs.nytimes.com)