Participancts at the Midwest Governors’ Conference spent Monday looking at a different kind of defense. The Immigration and Naturalization Service may try patrolling the borders for illegal crossings, but ag officials want to ward off germs. The patrol for livestock disease never stops, according to the USDA’s Jim Mosely. The deputy ag secretary told representatives from 13 states in Omaha Monday his agency’s working with the states to keep the borders secure from infectious diseases like foot-and-mouth, which could devastate the livestock industry and the nation’s food supply and economy. The trick, said Mosely, is to protect against agro-terrorist attack without closing the nation’s borders to business.