bis

f2L At & 39
January 30, 2006 orc

HUF G0 SCURETARI A)

Ms. Jean A. Webb

Secretary

Commodity Futures Trading Commission

Three Lafayette Center

1155 21* Street, N.W.

Washington, D.C. 20581

, Reference File #2625.01

Non-Material Agricultural
Rule Changes

Dear Ms. Webb:

Pursuant to Commission Regulation 40.4(b), the Chicago Board of Trade (CBOT®) hereby
submits the following:

- Amendments to Regulations 3701.06, 3702.03 and 3701.02 per the attached texts
(additions bold and underlined; deletions bracketed and struck through).

As summarized below, these amendments will bring CBOT Rough Rice contracts into greater
conformity with the other products in the Exchange’s agricultural complex. These changes
reflect input which the CBOT received via a recent survey of rice industry market participants.

1) Revised Regulation 3701.06 will change the last trading day for Rough Rice futures from the
eighth to last business day of the delivery month to the business day prior to the 15" calendar
day of the delivery month. With this change, the last trading day for Rough Rice futures will
conform with the last trading day for all other CBOT agricultural futures.

2) Revised Regulation 3702.03 will change the last delivery day for Rough Rice futures from
the last business day of the delivery month to the seventh business day following last trading
day. With this change, the last delivery day for Rough Rice futures will conform with the
last delivery day for Wheat and Oat futures, which also are warehouse receipt products.

3) Revised Regulation 3701.02 will change the open auction regular trading hours for Rough
Rice futures. Currently 9:15 a.m. to 1:30 p.m., the revised hours will be 9:30 a.m. to 1:15
p.m. (Central Time). This trading hours change also will apply to Rough Rice options, as
determined by the Board pursuant to Regulation 3810.01. With this change, the open auction
trading hours for Rough Rice futures and options will conform with the open auction trading
hours for all other full-sized CBOT agricultural contracts.


January 30, 2006
Ms. Jean A. Webb
Page Two

The CBOT intends to implement the last trading day and last delivery day changes (revised
Regulations 3701.06 and 3702.03) for newly listed contract months beginning with the May
2007 Rough Rice futures contract. This contract month has not yet been listed for trading, and
thus has no open interest. The CBOT intends to implement the revised Rough Rice trading hours
as of May 1, 2006.

There were no opposing views among the CBOT Board of Directors concerning these
amendments.

The CBOT certifies that these amendments comply with the Commodity Exchange Act and the
tules thereunder.

Sincerely,

Paul J. Draths
Vice President and Secretary

b012406


Additions are bold and underlined. Deletions are [Bracketed-with-strikethrough].

3701.06 Termination of Trading - No trades shall be made after the business day preceding the 415"
calendar day [duringthe-tast busin days] of the trading month. Any trades remaining open
during this period shall be settled by delivery or a bona fide exchange of futures for the cash commodity
or over-the-counter transaction.

3702.03 Delivery Dates - For the trading months of January, March, May, July, September and
November, delivery may be made by the seller upon any business day of the delivery month the seller
may select. Delivery must be made no later than the seventh business day following the last trading
day [last business-day] of the delivery month.

3701.02 Trading Months and Hours - Futures contracts shall be traded initially for delivery during the
months of September, November, January, March, May and July of each year. The number of months to
be open at one time shall be at the discretion of the Exchange. Trading shall be conducted from 9:30[45]
a.m. to 1:15[30] p.m. Chicago Time, except in the expiring contract on the last day of trading when trading
shall cease at 12:00 Noon.