Investor Relations

WILMINGTON, Mass., April 6 /PRNewswire-FirstCall/ -- Charles River Laboratories International, Inc. (NYSE: CRL) will release first-quarter 2005 financial results on Tuesday, May 3, 2005, after the market closes. A conference call has been scheduled to discuss the results on Wednesday, May 4, 2005, at 8:30 a.m. E.T.

Investors will have the opportunity to listen to a live webcast of the conference call through the Investor Relations section of the Company's website at http://ir.criver.com. A replay will be accessible through the website approximately two hours following the conference call and will remain available until Wednesday, May 11, 2005.

Charles River Laboratories, based in Wilmington, Massachusetts, is a global provider of solutions that advance the drug discovery and development process. Our leading-edge products and services are designed to enable our clients to bring drugs to market faster and more efficiently. Backed by our rigorous, best-in-class procedures and our proven data collection, analysis and reporting capabilities, our products and services are organized into three categories spanning every step of the drug development pipeline: Research Models and Services, Preclinical Services, and Clinical Services. Charles River's customer base includes all of the major pharmaceutical companies, biotechnology companies, government agencies and many leading hospitals and academic institutions. Charles River's 8,000 employees serve clients in more than 50 countries. For more information on Charles River, visit our website at http://www.criver.com.

Investor Relations Contact:
Susan E. Hardy
Director, Investor Relations
(978)658-6000 Ext.1616

SOURCE Charles River Laboratories International, Inc.
/Web Site: http://www.criver.com /
(CRL)