the fast-casual chain , which plans on having 2,000 stores by the end of the year , removed carnitas pork burritos from roughly a third of its locations in january , but still does n't have a stable supply of the meat .
chipotle , which dropped one of its pork vendors earlier this year , only uses humanely-raised pigs that have not received added hormones , though they have become harder to acquire after demand has risen .