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What is recombinant bovine somatotropin hormone, and why do some of the dairy products in my fridge have labels saying they don’t contain it?

I’d specifically like to tackle the first part of this question, and explain what recombinant bovine somatotropin (rbST)—also called recombinant bovine growth hormone (RBGH)—is. At the most basic level, Bovine Somatotropin (bST) is a protein hormone produced in the pituitary gland of a cow’s brain. bST is responsible for the regulation of milk production in lactating dairy cows. This occurs through coordination of the cow’s metabolism, such that the nutrients she consumes through her feed are efficiently used to produce milk.

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