Three words posted on the door of the fledgling Chipotle on campus left pork lovers disappointed this week: “Sorry, no carnitas.”

The restaurant’s website states that Chipotle only purchases pigs that “are raised outside or in deeply bedded pens, are never given antibiotics and are fed a vegetarian diet.” The company discovered in a routine audit earlier this month that these “responsibly raised” principles were violated by a pork supplier.

About one-third of Chipotle’s 1,700 restaurants across the country have taken carnitas off the menu until further notice.

“Conventionally raised pigs generally do not have access to the outdoors, spend their lives in densely crowded buildings, live on hard, slatted floors with no ability to root and are given antibiotics to keep them from getting sick,” Chris Arnold, a spokesman for the chain, told Bloomberg. “We would rather not serve pork at all than serve pork from animals raised in that way.”

Arnold declined to give Bloomberg the name of the pork supplier.

A restaurant that voluntarily discloses the GMO content of its ingredients, Chipotle claims it is looking to set the standard for humane treatment of livestock and incorporate the farm-to-table movement into a multimillion-dollar corporation.

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