Where are you? And how do you know for sure it was coyotes. 6 deer in one night sounds like a little much for some coyotes. Sounds like feral dogs killing for fun to me.
LOL dude u been watching to much tv its a proven fact that coyotes are fawns number one predator y would u say hogs, hogs are more scavengers and by the way bud broken glass and hamburger meat is the way to go with the coyotes poison isn't broken glass won't contaminate anything and it will wipe them out.