Thu September 4, 2003 03:35 PM ET By Bob Burgdorfer CHICAGO (Reuters) - The U.S. cattle industry is enjoying one of its best years ever -- even if it's largely at the expense of its huge trading partner and neighbor, Canada. U.S. cash cattle prices traded this week near the record highs last seen a decade ago, and feedlots are now raking in unheard-of profits of $150 to $200 for each fattened steer and heifer they sell to beef plants. High cattle prices and significant profits are likely to continue through the balance of the year, analysts said, because cattle...