Robert J. Peterson JoAnn R. Smith c/o IBP, inc. 800 Stevens Port Drive Dakota Dunes, South Dakota 57049 June 27, 2001 Re: Voting Agreement ---------------- Reference is made to the Voting Agreement (the "Voting Agreement"), dated as of January 1,...

                                                                  EXHIBIT (d)(6)



                            Tyson Limited Partnership
                             0000 Xxxx Xxxxxxx Xxxxx
                            Xxxxxxxxxx, XX 00000-0000



Xxxxxx X. Xxxxxxxx
XxXxx X. Xxxxx
c/o IBP, inc.
000 Xxxxxxx Xxxx Xxxxx
Xxxxxx Xxxxx, Xxxxx Xxxxxx  00000
                                              June 27, 2001


              Re:  Voting Agreement
                   ----------------

     Reference is made to the Voting Agreement (the "Voting Agreement"), dated
as of January 1, 2001, between the undersigned (the "Stockholder") and IBP, inc.
(the "Company") and the Agreement and Plan of Merger (the "Merger Agreement"),
dated of January 1, 2001, among Tyson Foods, Inc., Lasso Acquisition
Corporation and the Company. The Stockholder has reviewed the terms and
conditions of the Stipulation and Order (including Annex A thereto) dated the
date hereof (the "Stipulation"), which modifies the Merger Agreement. The
Stockholder hereby confirms that this letter is written approval (as
contemplated by Section 1(i) of the Voting Agreement) of the modifications to
the Merger Agreement effected by the Stipulation and that the terms of the
Voting Agreement remain in full force and effect.


                                              Tyson Limited Partnership



                                          By: /s/ Xxx Xxxxx
                                              --------------------------------
                                              Xxx Xxxxx
                                              Managing General Partner

cc:   Xxxxxx X. Xxxxx, Esq.
      Xxxxxxx X. Xxxxxxx, Esq.