The Bush administration is taking major steps to boost confidence in the U.S. beef supply at home and abroad, where more than 30 countries have banned American beef products since mad cow disease first surfaced in Washington state a week ago. The changes announced Tuesday include a ban on meat from cows that can't walk or stand on their own and a promise to speed creation of a nationwide animal tracking system. Agriculture Secretary Ann Veneman said consumers shouldn't see an increase in prices as a result. A spokesman for the meatpacking industry, however, said beef prices could increase "pennies...