CHICAGO (AP) _ Grain futures were mixed Monday on the Chicago Board of Trade. Dec. corn gained 0.25 cent at…CHICAGO (AP) _ Grain futures were mixed Monday on the Chicago Board of Trade. Dec. oats lost 1 cents at $3.09 a bushel. Beef was lower and pork was lower on the Chicago Mercantile Exchange. Oct. live cattle lost 0.72 cent at $2.31 a pound.