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                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13G
--------------------------------------------------------------------------------


                    Under the Securities Exchange Act of 1934

                                (Amendment No. )*


                                PERRIGO COMPANY(1)
            ---------------------------------------------------------
                                (Name of Issuer)


                                  COMMON STOCK
            ---------------------------------------------------------
                         (Title of Class of Securities)


                                    714290103
                         ------------------------------
                                 (CUSIP Number)


                                DECEMBER 31, 2000
             (Date of Event Which Requires Filing of this Statement)
            ---------------------------------------------------------


Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:

                                [X] Rule 13d-1(b)
                                [ ] Rule 13d-1(c)
                                [ ] Rule 13d-1(d)


----------

(1)  The remainder of this cover page shall be filled out for a reporting
     person"s initial filing on this form with respect to the subject class of
     securities, and for any subsequent amendment containing information which
     would alter the disclosures provided in a prior cover page.

     The information required in the remainder of this cover page shall not be
     deemed to be "filed" for the purpose of Section 18 of the Securities
     Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of
     that Section of the Act but shall be subject to all other provisions of the
     Act (however, see the Notes).



   2


Schedule 13G                                                       Page 2 of 6
CUSIP No. 714290103                                            PERRIGO COMPANY
--------------------------------------------------------------------------------
     1    NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

               Berger Small Cap Value Fund(2)   ID No.  36-3344166
--------------------------------------------------------------------------------
     2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                      (a) [ ]
                                                                      (b) [ ]
--------------------------------------------------------------------------------
     3    SEC USE ONLY

--------------------------------------------------------------------------------

     4    CITIZENSHIP OR PLACE OF ORGANIZATION

               Massachusetts
--------------------------------------------------------------------------------
                              5    SOLE VOTING POWER

                                         -0-
       NUMBER OF              -------------------------------------------------
         SHARES               6    SHARED VOTING POWER
      BENEFICIALLY
        OWNED BY                     3,953,690(3)
          EACH                -------------------------------------------------
       REPORTING              7    SOLE DISPOSITIVE POWER
         PERSON
          WITH                           -0-
                              -------------------------------------------------
                              8    SHARED DISPOSITIVE POWER

                                     3,953,690(3)
--------------------------------------------------------------------------------
     9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

               3,953,690
--------------------------------------------------------------------------------

    10    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
                                                                           [ ]
--------------------------------------------------------------------------------

    11    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

               5.38%
--------------------------------------------------------------------------------

    12    TYPE OF REPORTING PERSON

               IV
--------------------------------------------------------------------------------


----------
(2)  Berger Small Cap Value Fund is a portfolio series established under the
     Berger Omni Investment Trust, an open-end management investment company
     registered under the Investment Company Act of 1940, as amended.


(3)  Perkins, Wolf, McDonnell & Company is the sub investment advisor delegated
     with investment and voting authority.




   3

Schedule 13G                                                       Page 3 of 6
CUSIP No. 714290103                                            PERRIGO COMPANY
--------------------------------------------------------------------------------


Item 1.

         (a)      Name of Issuer: PERRIGO COMPANY

         (b)      Address of Issuer"s Principal Executive Offices:

                  515 EASTERN AVENUE
                  ALLEGAN, MICHIGAN 49010

Item 2.

         (a)      Name of Person Filing:

                  (1)      BERGER SMALL CAP VALUE FUND(4)

         (b)      Address of Principal Business Office:

                  (1)      BERGER SMALL CAP VALUE FUND
                           210 UNIVERSITY BOULEVARD, SUITE 900
                           DENVER, COLORADO  80206

         (c)      Citizenship:

                  (1)      Berger Small Cap Value Fund:     MASSACHUSETTS

         (d)      Title of Class of Securities:   COMMON STOCK

         (e)      CUSIP Number:    714290103

Item 3. If this statement is filed pursuant to Rule 13d-1(b), or 13d-2(b),
        check whether the person filing is a:

         (a)       Broker or Dealer registered under Section 15 of the Act
            -----

         (b)       Bank as defined in section 3(a)(6) of the Act
            -----

         (c)       Insurance Company as defined in section 3(a)(19) of the Act
            -----


----------

(4)  Berger Small Cap Value Fund is a portfolio series established under the
     Berger Omni Investment Trust, an open-end management investment company
     registered under the Investment Company Act of 1940, as amended.


   4


Schedule 13G                                                       Page 4 of 6
CUSIP No. 714290103                                            PERRIGO COMPANY
--------------------------------------------------------------------------------


         (d)  X     Investment Company registered under section 8 of the
            -----   Investment Company Act

         (e)        Investment Adviser registered under section 203 of the
            -----   Investment Advisers Act of 1940

         (f)        Employee Benefit Plan, Pension Fund which is subject to the
            -----   provisions of the Employee Retirement Income Security Act
                    of 1974 or Endowment Fund; see section 240.13d-1(b)(1)(ii)
                    (F)

         (g)        Parent Holding Company, in accordance with section
            -----   240.13d-1(b)(1)(ii)(G) (Note:  See Item 7)

         (h)      Group, in accordance with section 240.13d-1(b)(1)(ii)(H)
            -----

Item 4. Ownership

         (a)      Amount Beneficially Owned:

                  (1)      Berger Small Cap Value Fund:  3,953,690
                                                        ----------

         (b)      Percent of Class:

                  (1)      Berger Small Cap Value Fund       5.38%
                                                        ---------


         (c)      Number of shares as to which such person has:

                  (i)      Sole power to vote or to direct the vote:       0
                                                                         ---
                  (ii)     Shared power to vote or to direct the
                           vote:                                   3,953,690(5)
                                                                 -----------

                  (iii)    Sole power to dispose or to direct the
                           disposition of:                                 0
                                                                         ---

                  (iv)     Shared power to dispose or to direct the
                           disposition of:                         3,953,690(5)
                                                                 -----------

Item 5. Ownership of Five Percent or Less of a Class:

              N/A


----------

(5)  Perkins, Wolf, McDonnell & Company is the sub investment advisor delegated
     with investment and voting authority.

   5



Schedule 13G                                                       Page 5 of 6
CUSIP No. 714290103                                            PERRIGO COMPANY
--------------------------------------------------------------------------------


Item 6. Ownership of More than Five Percent on Behalf of Another Person:

              N/A

Item 7. Identification and Classification of the Subsidiary Which Acquired the
        Security Being Reported on By the Parent Holding Company:

              N/A

Item 8. Identification and Classification of Members of the Group:

              N/A

Item 9. Notice of Dissolution of Group:

              N/A

Item 10. Certification:

              BY SIGNING BELOW I CERTIFY THAT, TO THE BEST OF MY KNOWLEDGE AND
              BELIEF, THE SECURITIES REFERRED TO ABOVE WERE ACQUIRED AND ARE
              HELD IN THE ORDINARY COURSE OF BUSINESS AND WERE NOT ACQUIRED AND
              ARE NOT HELD FOR THE PURPOSE OF OR WITH THE EFFECT OF CHANGING OR
              INFLUENCING THE CONTROL OF THE ISSUER OF SUCH SECURITIES AND WERE
              NOT ACQUIRED AND ARE NOT HELD IN CONNECTION WITH OR AS A
              PARTICIPANT IN ANY TRANSACTION HAVING SUCH PURPOSE OR EFFECT.




   6


Schedule 13G                                                       Page 6 of 6
CUSIP No. 714290103                                            PERRIGO COMPANY
--------------------------------------------------------------------------------



                                    SIGNATURE

         After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.


                                      BERGER SMALL CAP VALUE FUND:


                                      February 14, 2001
                                      ----------------------------------------
                                      Date

                                      /s/ Brian S. Ferrie
                                      ----------------------------------------
                                      Signature

                                      Brian S. Ferrie, Vice President
                                      ----------------------------------------
                                      Name/Title