AmerisourceBergen Corp., a U.S. drug distributor, agreed to buy MWI Veterinary Supply Inc. for $2.5 billion to add fast-growing animal-health supplies.

Amerisource will offer $190 a share in cash for Boise, Idaho-based MWI, the companies said in a statement today. The price is 8.2 percent above the closing level for MWI on Jan. 9.

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