CHICAGO (AP) - Grain futures were lower Tuesday in early trading on the Chicago Board of Trade.Wheat for Sept delivery was unchanged at $5.44 a bushel; Dec corn was 2.75 cents lower at $3.665 a bushel; Dec oats were unchanged at $3.305 a bushel; while Nov soybeans dropped 19.5 cents to $10.60 a bushel.Beef mostly higher and pork lower on the Chicago Mercantile Exchange.Oct live cattle was .22 cent