Wild horse roundup planned at Nev. wildlife refuge The U.S. Fish and Wildlife Service intends to round up hundreds of wild horses this week from a national wildlife refuge on the Nevada-Oregon line, putting most up for adoption and sterilizing males before they are returned to the wild in an effort to keep the herd in check. The gather at the Sheldon National Wildlife Refuge was scheduled to begin Tuesday, officials said. Refuge managers said of the 340 horses targeted for roundup, 200 of those deemed most desirable will be put up for adoption through the Tennessee-based Carr's Wild Horse and Burro Adoption Center, a private agency that has placed thousands of gathered mustangs and burros for nearly 30 years. The remaining 140 will be released back into the wild, but males will be sterilized through vasectomy to try to stem population growth, officials said....