can a person take antlers off a deer elk etc. with the meat when salvaging it

Yes, as long as you follow the salvage reporting requirments outlined at  fishandgame.idaho.gov/roadkill. By notifying Idaho Fish and Game within 24 hours and completing reporting requirements (to obtain a free permit) within 72 hours, a person can now: Recover and keep wildlife species classified as upland birds, upland game animals, big game, furbearers, unprotected wildlife, and predators that may be lawfully hunted or trapped that have been killed by accidental vehicle-collisions.  Protected non-game wildlife, Threatened or Endangered species, migratory birds (which are federally protected), and other wildlife species not lawfully hunted or trapped may not be recovered, possessed, or salvaged. Purchase or sell wildlife parts, except the edible flesh, of wildlife species classified as big game, upland game, upland game birds, furbearers, or rattlesnakes that may be lawfully hunted or trapped that have been killed by accidental vehicle-collisions.  Bighorn sheep cannot be purchased, bartered, or sold.   Retain and consume the meat of wildlife species classified as big game, upland game animals, upland game birds, and furbearing animals which may be lawfully hunted or trapped that have been killed by accidental vehicle-collisions.   Persons salvaging and consuming this meat do so at their own risk.