WILMINGTON, Mass.--(BUSINESS WIRE)--Charles River Laboratories International, Inc. (NYSE: CRL) today reported its results for the first quarter of 2012. For the quarter, net sales from continuing operations were $286.0 million, effectively unchanged from $285.8 million in the first quarter of 2011. Foreign currency translation reduced the reported sales by 1.0%. On a segment basis, sales increased in the Research Models and Services (RMS) segment, but declined in the Preclinical Services (PCS) segment.