sentences:  The April 26 and April 27 recalls by Blue Buffalo, Canine Caviar, Diamond, Harmony Farms, and Natural Balance are claimed by all five brands to be due to unauthorized inclusion of rice protein by American Nutrition, Inc. (ANI), their manufacturer.This adds a new potential source of contamination and distrust, namely non-compliant contract manufacturers, beyond the original problematic Chinese ingredient suppliers.Diamond and Natural Balance refer to this as a "manufacturing deviation" by ANI.