Breathe easy, livestock lovers. Housed in a vast storehouse in Fort Collins, Colorado, the USDA has 700,000 straws of liquid nitrogen-preserved sperm, from 18 different species. They’re ready. “Let’s say another foot-and-mouth disease comes along, killing off our cows,” says Dr. Harvey Blackburn, repository coordinator. “We have the ability to repopulate entire breeds.” The National Animal Germplasm Program (NAGP) started in 1999. Its fac

