A federal judge yesterday tossed out a lawsuit from ranchers who were aiming to stop the feds from reintroducing wolves in the Southwest. The New Mexico Cattle Growers Association and other ranchers had filed suit claiming that the wolves would kill more cattle than wildlife officials had predicted. The reintroduction effort in the Southwest is now in its second year, and about 22 wolves are roaming the region in three packs. Five wolves were shot to death last year, and one wolf turned up dead yesterday, perhaps hit by a moving vehicle.