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While in the United States , the average slaughter weight of a hog is 250 pounds , in Mexico the average slaughter weight is about 200 pounds , Hayes says.Caspers added that when U.S. lightweight hogs began to flow into Mexico in the late 1990s , Mexico responded by initiating an antidumping case . Since launching ADCS in the late 1990s , Wilkes has built relationships with key legislators on Capitol Hill . " The 19-year-old company , which went public in the late 1990s , has spent the past several years expanding its sales force to keep up with demand from businesses and consumers for IT products . House Democrats are confident they can approve an energy package Thursday which includes a conservation fee on oil and gas from the Gulf of Mexico , seeks to recoup royalties lost because of a government error in drilling leases in the late 1990s , and rolls back several oil industry tax breaks . PhotodiscFish farms are in danger of losing any ground they may have gained over the past few years to becoming a sustainable industry , according to Rebecca Goldburg , a senior scientist with Environmental Defense in New York.While aquaculture is proving less wasteful now than in the late 1990s , it is using up more resources than ever before .