Document:

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                    ACKNOWLEDGEMENT OF 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, both 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.

The Extended Maturity Date under the Notes is July 9, 2005. Under Section 2(b)
of the Notes the Maturity Date may be extended for up to three periods of three
months. Virbac S.A. hereby agrees to extend the Maturity Date under the notes
until October 9, 2004. This Acknowledgement of Extended Maturity Date does not,
under any circumstances, constitute a waiver of the automatic extension to
Maturity Date set forth in Section 2(b) of the Notes.

Agreed to and acknowledged this 3rd day of June, 2004:

VIRBAC S.A.

/s/ Eric Maree
__________________________           ________________________
Name: Eric Maree                              Date
Title: President of the Management Board<PAGE>

                               VIRBAC CORPORATION
                                    FORM 10-Q
                               SEPTEMBER 30, 2003

Exhibit 10.19

Secured Subordinated Promissory Note for $2,000,000 by and among Virbac
Corporation, PM Resources, Inc., St. JON Laboratories, Inc., Francodex
Laboratories, Inc., Virbac AH, Inc., Delmarva Laboratories, Inc., and Virbac,
S.A., dated June 4, 2004.

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      THIS NOTE HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS
AMENDED ("THE SECURITIES ACT"), OR ANY APPLICABLE STATE SECURITIES LAWS. THIS
NOTE HAS BEEN ACQUIRED FOR INVESTMENT AND NO INTEREST HEREIN MAY BE SOLD,
DISTRIBUTED, ASSIGNED, OFFERED, PLEDGED OR OTHERWISE TRANSFERRED UNLESS (A)
THERE IS AN EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT AND
APPLICABLE STATE SECURITIES LAWS COVERING ANY SUCH TRANSACTION INVOLVING THIS
NOTE, (B) THE BORROWERS RECEIVE AN OPINION OF LEGAL COUNSEL ADDRESSED TO THE
HOLDER OF THIS NOTE (CONCURRED IN BY LEGAL COUNSEL FOR THE HOLDER) STATING THAT
SUCH TRANSACTION IS EXEMPT FROM REGISTRATION, OR (C) THE BORROWERS ARE OTHERWISE
SATISFIED THAT SUCH TRANSACTION IS EXEMPT FROM REGISTRATION.

      THIS NOTE IS SUBJECT TO A SUBORDINATION AGREEMENT IN FAVOR OF FIRST BANK
DATED AS OF APRIL 9, 2004.

June 3, 2004                                                       $2,000,000.00

                               VIRBAC CORPORATION
                      SECURED SUBORDINATED PROMISSORY NOTE

      FOR VALUE RECEIVED, Virbac Corporation, a Delaware corporation (the
"Company"), PM Resources, Inc., a Missouri corporation ("PM"), St. Jon
Laboratories, Inc., a California corporation ("St. Jon"), Francodex
Laboratories, Inc., a Kansas corporation ("Francodex"), Delmarva Laboratories,
Inc., a Virginia corporation ("Delmarva") and Virbac AH, Inc., a Delaware
corporation ("AH", with Virbac , PM, St. Jon, Francodex, Delmarva and AH being
hereafter sometimes referred to individually as a "Borrower" and collectively as
the "Borrowers"), hereby promise to pay to the order of Virbac S. A. or its
registered assigns (the "Holder"), the maximum aggregate principal sum of Two
Million Dollars ($2,000,000.00) or such lesser amount of any loans made by
Holder to Borrowers as recorded on the books and records of Holder, together
with interest thereon at the rate(s) set forth in Section 1 below. This Secured
Subordinated Promissory Note (this "Note") shall be subordinate to the
indebtedness (the "Senior Indebtedness") of Borrowers under that certain Credit
Agreement, dated September 7, 1999, as previously amended, most recently by the
Seventh Amendment, dated March 1, 2004, and as the same may be further amended
hereafter (the "Credit Agreement") and the obligation of Borrowers to repay the
principal and interest due to the Holder under this Note shall be secured by a
collateral pledge of all the current and future assets of Borrowers pursuant to
the Amended and Restated Security Agreement, dated as of April 29, 2004, entered
into by Borrowers and the Holder named therein (the "Security Agreement"), which
lien shall be subordinate to any lien granted by Borrowers to secure payment of
the Senior Indebtedness pursuant to the terms of the Subordination Agreement
entered into by the Holder in favor of First Bank, dated as of April 9, 2004.
This Note shall rank pari passu with that certain Secured Subordinated
Promissory Note by Borrowers in favor of Holder, dated as of April 9, 2004, in
the amount of $3,000,000.00 and that certain Subordinated Promissory Note by
Borrowers in favor

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of Holder, dated as of April 29, 2004, in the amount of $4,000,000.00 (the
"April Notes"). The April Notes, together with this Note, shall be referred to
collectively herein as the "Notes." Upon payment in full of all principal and
interest payable hereunder, this Note shall be surrendered to the Borrowers for
cancellation.

      At any time it is requesting a loan, the Company shall give written or
telecopy notice to Holder, which notice shall be irrevocable and shall be given
by no later than 9:00 a.m. (Central Time) four days prior to the date it
requests that Holder make a loan hereunder. Each such notice shall specify the
date the loan is requested (which shall be a business day) and the dollar amount
of such loan. Holder shall use commercially reasonable efforts to provide
currently available cash to Borrowers on the date specified in Borrowers'
request but shall not be liable to Borrowers or any other person if it fails to
provide currently available cash to Borrowers on or before the close of business
on the specified date if such failure is a result of the process and procedures
necessary to transfer cash balances across international borders.

      The following is a statement of the rights of the Holder and the
conditions to which this Note is subject, and to which the Holder, by the
acceptance of this Note, agrees:

1.    Calculation of Interest.

      (a) From the date hereof until all of Borrowers' obligations under this
Note have been fully satisfied, the principal outstanding under this Note from
time to time shall bear interest on a basis of a 360-day year for the actual
number of days amounts are outstanding hereunder, at a variable rate initially
equal to five and one half percent (5.5%) per annum (the "Base Rate") as
adjusted in accordance with the provisions of subsection (b) below (such rate,
as adjusted, the "Adjusted Rate").

      (b) On the first day of each calendar month beginning with July 1, 2004
(each such day an "Interest Rate Adjustment Date"), the interest rate to be
charged against the outstanding principal balance for the remainder of that
calendar month will be recalculated by adding to the Base Rate such amount equal
to the higher of (i) the amount by which the Current One Month LIBOR US Dollar
Rate exceeds the LIBOR Reference Rate or (ii) the amount that the Current One
Month EURIBOR Rate exceeds the EURIBOR Reference Rate, provided, however, that:

            (i)   No adjustment shall be made to the Base Rate on any Interest
                  Rate Adjustment Date prior to the first Interest Rate
                  Adjustment Date until either the Current One Month LIBOR US
                  Dollar Rate exceeds the LIBOR Reference Rate or the Current
                  One Month EURIBOR Rate exceeds the EURIBOR Reference Rate,
                  respectively, by more than 50 basis points (0.5%); thereafter,
                  the Adjusted Rate will be adjusted on each Interest Rate
                  Adjustment Date as set forth in the first paragraph of this
                  Section 1(b); and

            (ii)  Although the Adjusted Rate may decrease following any decrease
                  in the one month LIBOR Spot Rate or Current One Month EURIBOR
                  Rate, it shall not be adjusted below five and one half percent
                  (5.5%) per annum.

                                       2
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      (c) For purposes of the forgoing:

            (i)   "Current One Month LIBOR US Dollar Rate" means the average
                  rate of interest equal to the per annum rate of interest at
                  which United States dollar deposits with a duration of one
                  month are offered in the London Interbank Market two business
                  days prior to the applicable Interest Rate Adjustment Date, as
                  calculated and reported daily by TELERATE

            (ii)  "Current One Month EURIBOR Rate" means the average rate of
                  interest equal to the per annum rate of interest at which Euro
                  deposits with a duration of one month are offered in the
                  London Interbank Market two business days prior to the
                  applicable Interest Rate Adjustment Date, as calculated and
                  reported daily by TELERATE.

            (iii) "EURIBOR Reference Rate" means the Current One Month EURIBOR
                  Rate as measured on March 31, 2004 or 2.024%.

            (iv)  "LIBOR Reference Rate" means the Current One Month LIBOR US
                  Dollar Rate as measured on March 31, 2004 or 1.09%.

      (d) On the last day of each calendar month beginning June 30, 2004 the
amount of interest due under this Note shall be calculated by applying the
Adjusted Rate as determined on the first day of such calendar month (or with
respect to the June 30, 2004 calculation by applying 5.5%) to the daily
outstanding principal balance under this Note. In making this calculation,
amounts will be deemed outstanding as of the beginning of the business day on
which holder initiates the transfer of such funds to Borrowers regardless of the
date on which such funds actually become available to Borrower in the United
States. Following the monthly calculation of interest due on this Note as
provided above, Holder shall deliver a written invoice to Borrowers. Each
invoice delivered by Holder to Borrowers hereunder shall show in reasonable
detail the method used to calculate the amount of interest shown on each such
invoice and shall be reasonably presumptive evidence of the interest then due
and owing on this Note.

2. Payments. All payments due hereunder shall be paid in United States dollars
and shall be made by wire transfer of immediately available funds to the account
or accounts from time-to-time specified in writing by Holder. Payments shall be
deemed to have been made on the date on which Borrowers initiated the transfer
of funds regardless of the date on which such funds actually become available to
Holder. Payment of the principal and interest on this Note shall be due and
payable as provided below.

      (a) Payments of interest on this Note shall be payable by Borrowers
          monthly, not more than three (3) business days following Borrowers'
          receipt of an invoice from Holder as set forth in Section 1(d) above.
          Any accrual and unpaid interest outstanding as of the Maturity Date
          (as defined below) shall be paid together with the principal payment
          as provided in Section 2(b) below.

                                       3
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      (b)   The principal of this Note shall be due and payable in a single
            installment upon the earlier to occur of October 9, 2004 (the
            "Maturity Date") or an Event of Default (as defined in Section 3
            hereof); provided, however, that the Maturity Date shall
            automatically be extended for up to three (3) periods of three
            months (with the last day of each such three (3) month period
            beginning an "Extended Maturity Date") unless Holder gives notice to
            Borrowers that it does not intend to extend the applicable Maturity
            Date or Extended Maturity Date. Such notice must be provided no more
            than thirty (30) and not less than fifteen (15) days prior to the
            Maturity Date or Extended Maturity Date, as the case may be.
            Notwithstanding the foregoing, Borrowers may, at any time, prepay
            all or any portion of the principal of and accrued interest on this
            Note without premium or penalty.

      (c)   Each payment made by Borrowers shall be applied first to the
            reimbursement of any costs, fees and expenses accrued by Holder,
            together with interest thereon, as provided in Section 4(b) below,
            second to the payment of any and all late charges, third to the
            payment of any and all accrued and unpaid interest and fourth to the
            payment of the principal of this Note.

3. Events of Default. The following events shall constitute an "Event of
Default" under this Note:

      (a) Borrowers shall fail to pay any amount owed as required under the
terms of this Note or the April Notes.

      (b) Proceedings for the appointment of a receiver, trustee, liquidator or
custodian of any of Borrowers or all or a substantial part of the property
thereof, or an involuntary case or other proceedings seeking liquidation,
reorganization or other relief with respect to any of Borrowers or the debts
thereof under any bankruptcy, insolvency or other similar law now or hereafter
in effect shall be commenced, and an order for relief entered or such proceeding
shall not be dismissed, discharged or stayed within ninety (90) days of
commencement;

      (c) Any of Borrowers shall (i) apply for or consent to the appointment of
a receiver, trustee, liquidator or custodian of itself or of all or a
substantial part of its property, (ii) be unable, or admit in writing its
inability, to pay its debts generally as they come due, (iii) make a general
assignment for the benefit of its creditors, (iv) be dissolved or liquidated in
full or in part, (v) commence a voluntary case or other proceeding seeking
liquidation, reorganization or other relief with respect to itself or its debts
under any bankruptcy, insolvency or other similar law now or hereafter in effect
or consent to any such relief or to the appointment of or taking possession of
its property by any official in an involuntary case or other proceeding
commenced against it, or (vi) take any action for the purpose of effecting any
of the foregoing;

      (d) Any of Borrowers fail to satisfy in any material respect, or otherwise
breach, any of the representations, warranties or covenants in the Notes or the
Security Agreement.

      (e) The occurrence and continuance of an Event of Default (as defined
therein) under the Security Agreement.

                                       4
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      (f) The occurrence and continuance of an event of default under the Credit
Agreement by and among Borrowers and Senior Lender dated September 7, 1999, as
amended, or any ancillary documents thereto.

If an Event of Default (other than an Event of Default specified in Section 3(c)
or Section 3(d) hereof) occurs and is continuing, then the Holder may declare
the outstanding principal amount and any accrued interest on this Note and all
other payments payable hereunder to be forthwith due and payable immediately,
without presentment, demand, protest or further notice of any kind, all of which
are hereby expressly waived by Borrower, to the fullest extent permitted by
applicable law. If an Event of Default specified in Section 3(c) or Section 3(d)
hereof occurs and is continuing, then the outstanding principal amount and any
accrued interest on this Note and all other payments payable hereunder shall
become and be immediately due and payable without any declaration or other act
on the part of the Holder, and the Holder may take all actions or exercise
remedies provided for pursuant to the Security Agreement, or otherwise, with
respect to the pledged Collateral (as defined in the Security Agreement). The
Holder by notice to the Company may rescind an acceleration and its consequences
if the rescission would not conflict with any judgment or decree and if all
existing Events of Default have been cured or waived, other than nonpayment of
principal or interest that has become due solely because of such acceleration.
No such rescission shall affect any subsequent default or impair any right
thereto.

4.    Miscellaneous.

      (a) Usury. It is the express intent of the Borrowers and the Holder hereto
that the payment of all or any portion of the outstanding principal amount of
and accrued interest under this Note be exempt from the application of any
applicable usury or similar laws under any state, federal or foreign
jurisdiction. Each of the Borrowers hereby irrevocably waive, to the fullest
extent permitted by law, any objection or defense which any Borrower, may now or
hereafter have to the payment when due of any and all Note principal or accrued
interest arising out of or relating to a claim of usury or similar laws and each
of the Borrowers hereby agrees that neither it nor any of its affiliates shall
in the future bring, commence, maintain, prosecute or voluntarily aid in any
action at law, proceeding in equity or other legal proceeding against the Holder
based on a claim that Borrowers' payment obligations under this Note violate the
usury or similar laws of any state, federal or foreign jurisdiction.
Notwithstanding the foregoing, in the event any interest is paid on this Note
which is deemed to be in excess of the then legal maximum rate, then that
portion of the interest payment representing an amount in excess of the then
legal maximum rate shall be deemed a payment of principal and applied against
the principal amount due under this Note.

      (b) Expenses. Borrowers agree to pay all costs of collection, including
reasonable attorneys' fees, incurred by the Holder in collecting or enforcing
this Note. The Borrowers agree to pay Holder upon demand, the amount of any and
all expenses, including fees, expenses and disbursements of Holder's counsel and
of any other expert or agent acting on Holders behalf, that Holder may incur in
collecting or enforcing this Note or in exercising rights under the Security
Agreement or the Subordination Agreement. Notwithstanding the forgoing, any
expense incurred by Holder as provided above shall be treated as an advance of
principal pursuant to this Note and shall bear interest at the then applicable
rate from the date such expense was incurred by Holder until the date paid by
the Borrowers.

                                       5
<PAGE>

      (c) Waiver. Any provision of this Note may be amended, waived or modified
upon the written consent of Borrowers and the Holder. A waiver or consent given
hereunder shall be effective only if in writing and in the specific instance and
for the specific purpose for which given.

      (d) Severability. In case any provision of this Note is deemed to be
invalid, illegal or unenforceable, the validity, legality and enforceability of
the remaining provisions will not in any way be affected or impaired thereby.

      (e) Governing Law. This Note shall be governed by and construed in
accordance with the laws of the State of Delaware without regard to the
conflicts of law principles thereof.

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<PAGE>

      IN WITNESS WHEREOF, the undersigned has caused this Note to be duly
executed and delivered by its proper and duly authorized officer as of the date
first written above.

                                                   VIRBAC CORPORATION

                                                   By: /s/ David Eller
                                                       -------------------------
                                                   Name: David Eller
                                                   Title: President

                                                   PM RESOURCES, INC.

                                                   By: /s/ David Eller
                                                       -------------------------
                                                   Name: David Eller
                                                   Title: President

                                                   ST. JON LABORATORIES, INC.

                                                   By: /s/ David Eller
                                                       -------------------------
                                                   Name: David Eller
                                                   Title: President

                                                   FRANCODEX CORPORATION, INC.

                                                   By: /s/ David Eller
                                                       -------------------------
                                                   Name: David Eller
                                                   Title: President

                                                   DELMARVA CORPORATION, INC.

                                                   By: /s/ David Eller
                                                       -------------------------
                                                   Name: David Eller
                                                   Title: President

                                                   VIRBAC AH, INC.

                                                   By: /s/ David Eller
                                                       -------------------------
                                                   Name: David Eller
                                                   Title: President

                                       7

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