CHICAGO (AP) — Grain futures were mixed Tuesday in early trading on the Chicago Board of Trade. Wheat for March delivery was off 18.20 cents at $4.1540 a bushel; March corn fell 2.60 cents at 3.4660 a bushel; March oats rose 1.60 cents at $2.5220 a bushel while January soybeans advanced 28.40 cents at $9.6940 a bushel. Beef and pork were higher on the Chicago Mercantile Exchange. February live cattle was up 1.32 cents at $1.1820 a pound; January feeder cattle rose 1.23 cents at $1.4543 a pound; February lean hogs gained 1.35 cents at $.7258 a pound.