A majority of Wisconsin's dairy processors won't accept milk from cows treated with rBST by the end of the year.
Recombinant bovine somatotropin, or rBST, is a growth hormone used by some farmers to prolong a cow's lactation cycle. But consumer concerns about the hormone have lead more processors to require dairy farmers not to use the treatment.
John Umhoefer, executive director of the Wisconsin Cheese Makers Association, estimates close to 90 percent of the state’s milk will be rBST free in 2018.
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