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

                                   SCHEDULE TO
                                 (RULE 14d-100)
       Tender Offer Statement Pursuant to Section 14(d)(1) or 13(e)(1) of
                       the Securities Exchange Act of 1934

                               (AMENDMENT NO. 13)

                                    IBP, INC.
                            (Name of Subject Company)

                          LASSO ACQUISITION CORPORATION
                                TYSON FOODS, INC.
                        (Name of Filing Persons-Offeror)

                     COMMON STOCK, PAR VALUE $.05 PER SHARE
                         (Title of Class of Securities)
                                 _______________

                                    449223106
                      (Cusip Number of Class of Securities)

                                   LES BALEDGE
                                TYSON FOODS, INC.
                             2210 West Oaklawn Drive
                           Springdale, Arkansas 72762
                            Telephone: (501) 290-4000

   (Name, Address and Telephone Number of Person Authorized to Receive Notices
                 and Communications on Behalf of Filing Persons)
                                   Copies to:
                                 Mel M. Immergut
                                Lawrence Lederman
                       Milbank, Tweed, Hadley & McCloy LLP
                            One Chase Manhattan Plaza
                            New York, New York 10005
                            Telephone: (212) 530-5732

                            CALCULATION OF FILING FEE
                              Transaction Amount of
          valuation*                                      filing fee
    --------------------                             --------------------
       $1,570,612,320                                    $314,122.47



*    Estimated for purposes of calculating the amount of the filing fee only.

     The amount assumes the purchase of a total of 52,353,744 shares of the
outstanding common stock, par value $0.05 per share, of IBP, inc., at a price
per Share of $30.00 in cash. Such number of Shares, together with the 574,200
shares owned by Tyson Foods, Inc., represents approximately 50.1% of the
105,644,598 Shares of IBP, inc. outstanding as of December 28, 2000 (as
represented by IBP, inc. in the Agreement and Plan of Merger, dated January 1,
2001, by and between Tyson Foods, Inc., Lasso Acquisition Corporation, and IBP,
inc.).

[ ] Check box if any part of the fee is offset as provided by Rule 0-11(a)(2)
    and identify the filing with which the offsetting fee was previously paid.
    Identify the previous filing by registration statement number, or the Form
    or Schedule and the date of its filing.

Amount Previously Paid: 314,122.47       Filing Party:  Tyson Foods, Inc.
                                         (Offeror Parent) and Lasso
                                         Acquisition Corporation Form or
                                         Registration No.: Schedule TO
                                         Date Filed: December 12, 2000,
                                                     December 29, 2000 and
                                                     January 2, 2001

[ ]  Check the box if the filing relates solely to preliminary communications
     made before the commencement of a tender offer.

Check the appropriate boxes below to designate any transactions to which the
statement relates:

[_] third-party tender offer subject to Rule 14d-1.
[_] issuer tender offer subject to Rule 13e-4.
[_] going-private transaction subject to Rule 13e-3.
[_] amendment to Schedule 13D under Rule 13d-2.

Check the following box if the filing is a final amendment reporting the results
of the tender offer. [_]

AMENDMENT NO. 13 TO TENDER OFFER STATEMENT

     This Amendment No. 13 to the Tender Offer Statement on Schedule TO as the
same may have been amended from time to time (as amended hereby, the "Schedule
TO") relates to the offer by Lasso Acquisition Corporation, a Delaware
corporation ("Purchaser") and a wholly owned subsidiary of Tyson Foods, Inc.
("Tyson") to purchase the number of outstanding shares of common stock, par
value $0.05 per share (the "Shares"), of IBP, inc., a Delaware corporation
("Company"), which, together with the Shares owned by Tyson, constitutes 50.1%
of the outstanding Shares at $30.00 per Share, net to the seller in cash, upon
the terms and subject to the conditions set forth in the Supplement No. 1 to the
Offer to Purchase, dated January 5, 2001 (as amended, the "Supplement Offer to
Purchase"), and in the related Letter of Transmittal (which, together with any
amendments or supplements thereto, collectively constitute the "Offer").
Attached hereto as Exhibit (a)(23) is the Credit Agreement by and among Tyson
Foods, Inc. and certain lenders party thereto, dated as of January 12, 2001.

     Except as amended below, the information set forth in the Supplement Offer
to Purchase and the related Letter of Transmittal is incorporated herein by
reference with respect to Items 1 through 11 of this Schedule TO.

Item 7. Source and Amount of Funds or Other Consideration.

     The fourth sentence of Section 11 of the Supplement Offer to Purchase is
hereby amended and restated in its entirety:

     "Tyson has executed a Credit Agreement with various financial institutions
(including an affiliate of Merrill Lynch & Co., the Dealer Manager for the
Offer), dated as of January 12, 2001, which provides a new 364-day revolving
credit facility for the principal amount of $2.5 billion, which, when combined
with its existing revolving credit facility, would provide a back-stop for the
issuance of a total of up to $3.5 billion in commercial paper."


Item 12. Exhibits.

(a)(1)    Offer to Purchase dated December 12, 2000.*
(a)(2)    Letter of Transmittal (including Guidelines for Certification of
          Taxpayer Identification Number on Substitute Form W-9).*
(a)(3)    Notice of Guaranteed Delivery.*
(a)(4)    Letter to Brokers, Dealers, Commercial Banks, Trust Companies and
          Other Nominees.*
(a)(5)    Letter to Clients for use by Brokers, Dealers, Commercial Banks, Trust
          Companies and Other Nominees.*
(a)(6)    Form of summary advertisement dated December 12, 2000.*
(a)(7)    Press Release issued by Tyson dated December 11, 2000.*
(a)(8)    Tyson Conference call dated December 12, 2000.*
(a)(9)    Press Release issued by Tyson dated December 12, 2000.*
(a)(10)   Tyson Presentation delivered December 14, 2000.*
(a)(11)   Press Release issued by Tyson dated December 19, 2000.*
(a)(12)   Tyson Presentation delivered December 19, 2000.*
(a)(13)   Press Release issued by Tyson dated December 28, 2000.*
(a)(14)   Press Release issued by Tyson dated January 1, 2001.*
(a)(15)   Tyson Conference call dated January 2, 2001.*
(a)(16)   Supplement to the Offer to Purchase dated January 5, 2001.*
(a)(17)   Letter of Transmittal to the Supplement (including Guidelines for
          Certification of Taxpayer Identification Number on Substitute
          Form W-9).*
(a)(18)   Notice of Guaranteed Delivery to the Supplement.*
(a)(19)   Tyson Letter to IBP stockholders dated January 5, 2001.*
(a)(20)   Revised Tyson Letter to IBP stockholders dated January 5, 2001.*
(a)(21)   Tyson Shareholder Meeting dated January 12, 2001.*
(a)(22)   Press Release issued by Tyson dated January 12, 2001.*
(a)(23)   Credit Agreement by and among Tyson Foods, Inc. and certain lenders
          party thereto, dated as of January 12, 2001.
(d)(1)    Confidentiality Agreement between Parent and the Company dated
          December 4, 2000.*
(d)(2)    Proposed form of Merger Agreement to be entered into by and among
          Tyson, Purchaser and the Company.*
(d)(3)    Revised Merger Agreement, executed by Tyson.*
(d)(4)    Agreement and Plan of Merger dated as of January 1, 2001 among IBP,
          inc., Tyson Foods, Inc. and Lasso Acquisition Corporation.*
(d)(5)    Voting Agreement by and between Tyson Limited Partnership and IBP,
          inc. dated as of January 1, 2001.*
(d)(6)    Confidentiality Agreement between the Company and Parent dated
          December 18, 2000.*

*    Previously filed.


                                    SIGNATURE

After due 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.


                                 TYSON FOODS, INC.

                                        /s/ LES BALEDGE
                                 ------------------------------
                                          (Signature)
                                  Les Baledge, Executive Vice
                                 President and General Counsel
                                 ------------------------------
                                         (Name and Title)
                                         January 16, 2001
                                 ------------------------------
                                             (Date)
                                 LASSO ACQUISITION CORPORATION
                                         /s/ LES BALEDGE
                                 ------------------------------
                                           (Signature)
                                  Les Baledge, Executive Vice President
                                 ----------------------------------------
                                         (Name and Title)
                                         January 16, 2001
                                 ----------------------------------------
                                              (Date)



EXHIBIT INDEX
Exhibit No.
-----------
(a)(1)    Offer to Purchase dated December 12, 2000.*
(a)(2)    Letter of Transmittal (including Guidelines for Certification of
          Taxpayer Identification Number on Substitute Form W-9).*
(a)(3)    Notice of Guaranteed Delivery.*
(a)(4)    Letter to Brokers, Dealers, Commercial Banks, Trust Companies and
          Other Nominees.*
(a)(5)    Letter to Clients for use by Brokers, Dealers, Commercial Banks, Trust
          Companies and Other Nominees.*
(a)(6)    Form of summary advertisement dated December 12, 2000.*
(a)(7)    Press Release issued by Tyson dated December 11, 2000.*
(a)(8)    Tyson Conference call dated December 12, 2000.*
(a)(9)    Press Release issued by Tyson dated December 12, 2000.*
(a)(10)   Tyson Presentation delivered December 14, 2000.*
(a)(11)   Press Release issued by Tyson dated December 19, 2000.*
(a)(12)   Tyson Presentation delivered December 19, 2000.*
(a)(13)   Press Release issued by Tyson dated December 28, 2000.*
(a)(14)   Press Release issued by Tyson dated January 1, 2001.*
(a)(15)   Tyson Conference call dated January 2, 2001.*
(a)(16)   Supplement to the Offer to Purchase dated January 5, 2001.*
(a)(17)   Letter of Transmittal to the Supplement (including Guidelines for
          Certification of Taxpayer Identification Number on Substitute
          Form W-9).*
(a)(18)   Notice of Guaranteed Delivery to the Supplement.*
(a)(19)   Tyson Letter to IBP stockholders dated January 5, 2001.*
(a)(20)   Revised Tyson Letter to IBP stockholders dated January 5, 2001.*
(a)(21)   Tyson Shareholder Meeting dated January 12, 2001.*
(a)(22)   Press Release issued by Tyson dated January 12, 2001.*
(a)(23)   Credit Agreement by and among Tyson Foods, Inc. and certain lenders
          party thereto, dated as of January 12, 2001.
(d)(1)    Confidentiality Agreement between Parent and the Company dated
          December 4, 2000.*`
(d)(2)    Proposed form of Merger Agreement to be entered into by and among
          Tyson, Purchaser and the Company.*
(d)(3)    Revised Merger Agreement, executed by Tyson.*
(d)(4)    Agreement and Plan of Merger dated as of January 1, 2001 among IBP,
          inc., Tyson Foods, Inc. and Lasso Acquisition Corporation.*


(d)(5)    Voting Agreement by and between Tyson Limited Partnership and IBP,
          inc. dated as of January 1, 2001.*
(d)(6)    Confidentiality Agreement between the Company and Parent dated
          December 18, 2000.*

*    Previously filed.