EXHIBIT 99.10


                                                                         4/24/02
Mr. John G. Tramontana
Chairman of the Board
Bigmar, Inc.

        RE:         RESIGNATION AS DIRECTOR OF BIGMAR, INC.

Dear Mr. Tramontana:

         This letter confirms my emailed April 15, 2002 resignation as a member
of the board of directors of Bigmar, Inc. ("the Company"). My resignation has
been tendered to the Company in the context of the recent decision of the
Delaware Chancery Court, which invalidated consents to remove you and the other
four European directors from the board. Should this ruling be set aside on
appeal or otherwise, I reserve the right to seek reinstatement as a director.

         Over many months, I and the other U.S. directors of the Company have
had great difficulty obtaining timely, adequate and reliable information
regarding the Company's finances and operations from the management in
Switzerland. Consequently, it was becoming increasingly more difficult for me to
function effectively as a director of the Company and exercise business judgment
on the board as then constituted and with the incumbent management in place. I
have had strong reservations over the direction in which the operating
management in Switzerland has been conducting the affairs of the Company,
including dissatisfaction with such management's attention to internal financial
controls and adherence to governance practices.

         The manner in which the April 16, 2002 meeting of the Company's board
of directors was noticed, with an extensive agenda covering significant matters
affecting the Company and with no financial information and virtually no other
supporting information provided in advance of that meeting, was a further
instance of this unacceptable course of action and forced my decision to resign
prior to that meeting.

                                                       Very truly yours,


                                                       /s/ Cynthia R. May

                                                       Cynthia R. May