UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

INFORMATION REQUIRED IN PROXY STATEMENT

SCHEDULE 14A INFORMATION

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

(Amendment No.      )

Filed by the Registrant x   Filed by a Party other than the Registrant o

Check the appropriate box:

o Preliminary Proxy Statement

o Confidential, For Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

o Definitive Proxy Statement

x Definitive Additional Materials

o Soliciting Material Pursuant to § 240.14a-12

MWI Veterinary Supply, Inc.

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if Other Than the Registrant)

Payment of Filing Fee (Check the appropriate box):

x No fee required.

o Fee computed on table below per Exchange Act Rules 14a-6(i)(1) and 0-11.

(1)	Title of each class of securities to which transaction applies:
(2)	Aggregate number of securities to which transaction applies:
(3)	Per unit price or other underlying value of transaction computed pursuant to Exchange Act Rule 0-11 (set forth the amount on which the filing fee is calculated and state how it was determined):

(4)	Proposed maximum aggregate value of transaction:
(5)	Total fee paid:

o Fee paid previously with preliminary materials.

o Check box if any part of the fee is offset as provided by Exchange Act Rule 0-11(a)(2) and identify the filing for which the offsetting fee was paid previously. Identify the previous filing by registration statement number, or the Form or Schedule and the date of its filing.

(1) Amount previously paid:

(2) Form, Schedule or Registration Statement No.:

(3)	Filing Party:
(4)	Date Filed:

MWI VETERINARY SUPPLY ANNOUNCES POSTPONEMENT OF 2015 ANNUAL MEETING OF
STOCKHOLDERS

BOISE, ID -- (Marketwired) -- 01/12/15 -- MWI Veterinary Supply, Inc. (NASDAQ: MWIV) (the “Company”) announced today that it has indefinitely postponed its 2015 Annual Meeting of Stockholders, originally scheduled for Wednesday, February 11, 2015, due to the recently announced Agreement and Plan of Merger, dated January 11, 2015, by and among the Company, AmerisourceBergen Corporation and Roscoe Acquisition Corp., a wholly-owned subsidiary of AmerisourceBergen Corporation.

About MWI Veterinary Supply, Inc.:

MWI Veterinary Supply, Inc. is a leading distributor of animal health products across the United States of America and United Kingdom. MWI sells both companion animal and production animal products including pharmaceuticals, vaccines, parasiticides, diagnostics, micro feed ingredients, supplies, pet food, capital equipment and nutritional products. MWI is also a leading innovator and provider of value-added services and technologies used by veterinarians and producers.

Notice to Investors

The tender offer for the outstanding common stock of the Company (the “Offer”) has not yet commenced.  This communication is for informational purposes only and is not an offer to purchase or a solicitation of an offer to sell any securities of the Company.  The solicitation and offer to buy common stock of the Company will only be made pursuant to an Offer to Purchase and related materials.  At the time the tender offer is commenced, AmerisourceBergen Corporation and Roscoe Acquisition Corp. will file a tender offer statement, containing an offer to purchase, a form of letter of transmittal and other related documents with the SEC, and the Company will file a Solicitation/Recommendation Statement on Schedule 14D-9 with the SEC with respect to the Offer.  Investors are strongly advised to read these tender offer materials, as well as any other documents relating to the Offer and the associated transactions that are filed with the SEC, carefully and in their entirety when they become available, as they may be amended from time to time, because they will contain important information about the Offer that the Company’s stockholders should consider prior to making any decisions with respect to the Offer.  Investors may obtain a free copy of the Solicitation/Recommendation Statement and other documents (when available) that the Company files with the SEC at the SEC’s website at www.sec.gov, or free of charge from the Company at www.mwivet.com.