RENO, Nev. (AP) - Six wild horses rounded up on federal land in the West and sold to a private owner have been slaughtered - four months after Congress did away with protection for wild mustangs, a government official said Thursday. "This is something we regret and are very disappointed" about, said Celia Boddington, a spokeswoman for the U.S. Bureau of Land Management in Washington, D.C. "We make every possible effort when the horses are sold to make sure the animals are placed in good homes for long-term care." In December, Congress replaced a 34-year-old ban on slaughtering any mustang...