Charles River to Redeem Senior Convertible Debentures Due 2022

March 29, 2005

Charles River Laboratories International, Inc. announced that it has called for redemption all of its $185 million, 3.5 percent Senior Convertible Debentures due Feb. 1, 2022. Notices of redemption are being mailed to holders of the Debentures. The redemption date has been set at April 19, 2005. The Debentures are convertible into shares of Charles River's common stock at a conversion price of $38.87. The Debentures may be converted at any time before the close of business on April 18, 2005.

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