Charles River Laboratories International, Inc.is a provider of solutions, which accelerate the early-stage drug discovery and development process. The Company�s portfolio includes research models and services required to enable in vivo drug discovery and development. The Company operates in two segments: Research Models and Services (RMS) and Preclinical Services (PCS). Through RMS segment, the Company supplies research models to the drug development industry. The Company is engaged in the production and sale of rodent research model strains, genetically and microbiologically defined purpose-bred rats and mice. It also provides a range of related services, which are designed to assist its clients in supporting the use of research models in drug discovery and development. The Company�s PCS business segment provides services that enable its clients to outsource their critical, regulatory-required safety assessment and related drug development activities to the Company.