Grains end mixed Tuesday, with livestock mostly higher.  Jim McCormick, AgMarket.Net, says corn and soybeans slid on possible tariffs being placed on Mexico, Canada and China.  Wheat ended higher on short covering. Positioning ahead of end of the month and first notice day was also evident.  Cattle ended mostly higher with new highs for the move with import restrictions on Mexican feeder cattle due to New World Screwworm.  Hogs also extended gains into new contract highs.  

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