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Recombinant Bovine Growth Hormone
rBGH is a genetically engineered variant of the natural growth hormone produced by cows. Sold to dairy farmers under the trade name Posilac (formerly owned by Monsnato, now owned by Eli Lilly), injection of this hormone forces cows to boost milk production by about 10%, while increasing mastitis, lameness, and reproductive complications.
Thanks to consumer pressure (including OCA's Millions Against Monsanto campaign), major retailers, dairies, and cafes, from Kroger to Starbucks, have commited to sourcing milk from rBGH-free cows.