A lot of farms use goats milk. However, it seems a lot of farms switched to Red Cap recently, which is just whole milk you can purchase at the store. I know some farms mix it with milk replacer and some farms feed it as is.
My family and I purchase our milk for personal consumption from a farm certified to sell Raw Milk. They are subject to more stringent testing because they sell Raw Milk, however, they do not test for Johne's (pronounced “Yo-nees”), I asked them because I was going to feed my fawns this raw milk. Obviously, if they don't test for it, I will not use it and will feed Red Cap instead.
Here are a few facts about Johne's Disease from johne'sdisease.org :
* Research shows that, today, one out of 10 animals moving through livestock auction facilities has Johne’s disease.
* National Animal Health Monitoring Systems (NAHMS) study, Dairy 2007, shows that 68.1 percent of U.S. dairy operations are infected with Mycobacterium avium paratuberculosis (MAP), the bacteria known to cause Johne’s disease.
* Dairy 2007 also suggests that at least one out of every four U.S. dairy operations may have a relatively high percentage of Johne’s-infected cows in their herds.