I have a large lot of poison ivy. It is inbetween my chicken yard and the landlords corn field. I didn't know it was poison ivy until I decided to weedwack it I am now covered in red itchy blisters and the ivy continues to climb up and over/through my chainlink fence. I'm allergic to this stuff and it's horrible. My chickens haven't tooken interest in it like I wanted :/ Any ideas. We've tried roundup and am at a loss.