I agree with bluesranger,PLEASE, don't use antifreeze to kill anything it's very in humane. I have personally seen how animals die as a result of AF consumption at my wifes animal clinic, not a pretty sight.

As far as the effects of gutting the deer in the field, I don't see where this would cause any issues with,coyotes.

KEEP HUNTING THE GREAT OUTDOORS & GOD ALIVE, PASS IT ON!