Document:

<PAGE>

                 ACKNOWLEDGEMENT OF 2005 EXTENDED MATURITY DATE

Virbac Corporation, PM Resources, Inc., St. Jon Laboratories, Inc., Francodex
Laboratories, Inc., Delmarva Laboratories, Inc. and Virbac AH, Inc. are the
Borrowers under the Secured Subordinated Promissory Note dated as of April 9,
2004 and the Secured Subordinated Promissory Note dated April 29, 2004 and the
Secured Subordinated Promissory Note dated May 27, 2004, all in favor of Virbac
S.A. (the "Notes"). Capitalized terms used herein but not otherwise defined
shall have the meaning ascribed to them in the Notes.

Under Section 2(b) of the Notes, the Maturity Date may only be extended for
three periods of three months. The third and final Extended Maturity Date of the
Notes is April 9, 2005. Therefore, Virbac S.A., in accordance with Section 4(c)
of the Notes, agrees to modify Section 2(b) of the Notes so that the Notes may
be automatically extended for up to five periods of three months, thus extending
the Notes' final Extended Maturity Date to October 9, 2005. Additionally, under
Section 2(b) of the Notes, as modified herein, Virbac S.A. hereby agrees to
extend the Extended Maturity Date under the Notes to July 9, 2005. Under Section
2(b) of the Notes, as modified herein, on July 9, 2005 the Extended Maturity
Date of the Notes may be extended for one period of 3 months, to October 9,
2005.

Agreed to and acknowledged by:

VIRBAC S.A.

/s/ Eric Maree                                  February 8, 2005
--------------------------                      ----------------
Name: Eric Maree                                      Date
Title: President of the Management Board<PAGE>

                                 FIRST AMENDMENT
                                       TO
                      SECURED SUBORDINATED PROMISSORY NOTE
                            DATED AS OF APRIL 9, 2004

      This First Amendment is made as of the 24th day of March, 2005, by and
among Virbac Corporation, a Delaware corporation, PM Resources, Inc., a Missouri
corporation, St. Jon Laboratories, Inc., a California corporation, Francodex
Laboratories, Inc., a Kansas corporation, Delmarva Laboratories, Inc., a
Virginia corporation and Virbac AH, Inc., Delaware corporation (collectively,
the "Borrowers"), and Virbac S.A., a company organized under the laws of the
Republic of France (the "Holder") (capitalized terms used but not defined herein
shall have the meanings ascribed to such terms in that certain Secured
Subordinated Promissory Note, dated April 9, 2004, in the original principal
amount of $3,000,000.00 by and between the Borrowers and the Holder (the
"Note")).

      WHEREAS, the parties hereto desire to amend the Note as set forth herein;
and

      NOW, THEREFORE, for and in consideration of the premises and the mutual
covenants and agreements set forth herein and other good and valuable
consideration, the receipt and sufficiency of which are hereby acknowledged by
each of the parties hereto, the parties hereto hereby agree as follows:

            1. The Note is hereby amended in all respects necessary such that
      Maturity Date shall be automatically extended for up to five (5) periods
      of three months.

            2. Except as provided for in this First Amendment, the Note, as
      amended, shall remain in full force and effect and is hereby reaffirmed.

            3. This Amendment shall be interpreted, construed and enforced in
      accordance with the laws of the State of Delaware.

                   REMAINDER OF PAGE INTENTIONALLY LEFT BLANK.
                             SIGNATURE PAGE FOLLOWS.

<PAGE>

      IN WITNESS WHEREOF, the undersigned have executed this Amendment effective
as of the date first written above.

                                      BORROWERS:

                                      VIRBAC CORPORATION
                                      A DELAWARE CORPORATION

                                      By: /s/ Jean M. Nelson
                                      ----------------------------------------
                                      Name: Jean M. Nelson
                                      Title: Executive Vice President & C.F.O.

                                      PM RESOURCES, INC.
                                      A MISSOURI CORPORATION

                                      By: /s/ Jean M. Nelson
                                      ----------------------------------------
                                      Name: Jean M. Nelson
                                      Title: Executive Vice President & C.F.O.

                                      ST. JON LABORATORIES, INC.
                                      A CALIFORNIA CORPORATION

                                      By: /s/ Jean M. Nelson
                                      ----------------------------------------
                                      Name: Jean M. Nelson
                                      Title: Executive Vice President & C.F.O.

                                      FRANCODEX LABORATORIES, INC.
                                      A KANSAS CORPORATION

                                      By: /s/ Jean M. Nelson
                                      ----------------------------------------
                                      Name: Jean M. Nelson
                                      Title: Executive Vice President & C.F.O.

                                      DELMARVA LABORATORIES, INC.
                                      A VIRGINIA CORPORATION

                                      By: /s/ Jean M. Nelson
                                      ----------------------------------------
                                      Name: Jean M. Nelson
                                      Title: Executive Vice President & C.F.O.

<PAGE>

                                      VIRBAC AH, INC.
                                      A DELAWARE CORPORATION

                                      By: /s/ Jean M. Nelson
                                         -------------------------------------
                                      Name: Jean M. Nelson
                                      Title: Executive Vice President & C.F.O.

                                      HOLDER:

                                      VIRBAC S.A.
                                      A COMPANY ORGANIZED UNDER THE LAWS OF THE
                                      REPUBLIC OF FRANCE

                                      By: /s/ Eric Maree
                                         -------------------------------------
                                      Name: Eric Maree
                                      Title: President of the Management Board<PAGE>

                                 FIRST AMENDMENT
                                       TO
                      SECURED SUBORDINATED PROMISSORY NOTE
                           DATED AS OF APRIL 29, 2004

      This First Amendment is made as of the 24th day of March, 2005, by and
among Virbac Corporation, a Delaware corporation, PM Resources, Inc., a Missouri
corporation, St. Jon Laboratories, Inc., a California corporation, Francodex
Laboratories, Inc., a Kansas corporation, Delmarva Laboratories, Inc., a
Virginia corporation and Virbac AH, Inc., Delaware corporation (collectively,
the "Borrowers"), and Virbac S.A., a company organized under the laws of the
Republic of France (the "Holder") (capitalized terms used but not defined herein
shall have the meanings ascribed to such terms in that certain Secured
Subordinated Promissory Note, dated April 29, 2004, in the original principal
amount of $4,000,000.00 by and between the Borrowers and the Holder (the
"Note")).

      WHEREAS, the parties hereto desire to amend the Note as set forth herein;
and

      NOW, THEREFORE, for and in consideration of the premises and the mutual
covenants and agreements set forth herein and other good and valuable
consideration, the receipt and sufficiency of which are hereby acknowledged by
each of the parties hereto, the parties hereto hereby agree as follows:

            1. The Note is hereby amended in all respects necessary such that
      Maturity Date shall be automatically extended for up to five (5) periods
      of three months.

            2. Except as provided for in this First Amendment, the Note, as
      amended, shall remain in full force and effect and is hereby reaffirmed.

            3. This Amendment shall be interpreted, construed and enforced in
      accordance with the laws of the State of Delaware.

                   REMAINDER OF PAGE INTENTIONALLY LEFT BLANK.
                             SIGNATURE PAGE FOLLOWS.

<PAGE>

         IN WITNESS WHEREOF, the undersigned have executed this Amendment
effective as of the date first written above.

                                      BORROWERS:

                                      VIRBAC CORPORATION
                                      A DELAWARE CORPORATION

                                      By: /s/ Jean M. Nelson
                                         -------------------------------------
                                      Name: Jean M. Nelson
                                      Title: Executive Vice President & C.F.O.

                                      PM RESOURCES, INC.
                                      A MISSOURI CORPORATION

                                      By: /s/ Jean M. Nelson
                                         -------------------------------------
                                      Name: Jean M. Nelson
                                      Title: Executive Vice President & C.F.O.

                                      ST. JON LABORATORIES, INC.
                                      A CALIFORNIA CORPORATION

                                      By: /s/ Jean M. Nelson
                                         -------------------------------------
                                      Name: Jean M. Nelson
                                      Title: Executive Vice President & C.F.O.

                                      FRANCODEX LABORATORIES, INC.
                                      A KANSAS CORPORATION

                                      By: /s/ Jean M. Nelson
                                         -------------------------------------
                                      Name: Jean M. Nelson
                                      Title: Executive Vice President & C.F.O.

                                      DELMARVA LABORATORIES, INC.
                                      A VIRGINIA CORPORATION

                                      By: /s/ Jean M. Nelson
                                         -------------------------------------
                                      Name: Jean M. Nelson
                                      Title: Executive Vice President & C.F.O.

<PAGE>

                                      VIRBAC AH, INC.
                                      A DELAWARE CORPORATION

                                      By: /s/ Jean M. Nelson
                                         ______________________________________
                                      Name: Jean M. Nelson
                                      Title: Executive Vice President & C.F.O.

                                      HOLDER:

                                      VIRBAC S.A.
                                      A COMPANY ORGANIZED UNDER THE LAWS OF THE
                                      REPUBLIC OF FRANCE

                                      By: /s/ Eric Maree
                                        _______________________________________
                                      Name: Eric Maree
                                      Title: President of the Management Board

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