Jerry before you give up on the hackle, do you have a shed ( not too airtight) where you could hang them on a line out of reach of the critters for a few weeks. You might want to leave the door open in nice weather and let that smell dissipate a bit. Time and fresh air can do wonders. Just putting them on the clothesline would be better but I doubt that there would be much left after a few weeks out in the weather.