Perdue Farms Inc. agreed to acquire Natural Food Holdings and its Niman Ranch brand, a pork supplier for Chipotle Mexican Grill Inc., as part of its goal to expand into organic and antibiotic-free meat.

Closely held Perdue, the third-largest U.S. chicken producer, said in a statement Tuesday it’s buying the the business from private-equity firm LNK Partners. Perdue didn’t disclose terms for the deal, which is expected to be completed soon.

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