Another option not discussed here worked for me and my hell hound. This might get some negative feedback but it really doesn't hurt that bad put it on and shock yourself first if you want, I did.
Get a shock collar and crank it to max power, slap it on him and when he goes for the chicken, boom. If he goes for it again and he's not so smart, boom again. He shouldn't ever do it again. Cheaper and easier than fencing. My dog will defeat any physical fence eventually if determined, mental fences are harder to cross.
The thing is, a fence gives permission to cross it as long as you can, you've conditioned the dog to think- Oh there's a fence let's see if I can get in this is fun. With the collar his only conditioning is "whoa what the hell I went for this chicken and got shocked not sure why but I don't like that so I'm not doing that anymore." Key is to hide behind a tree or something and let him loose so that he thinks he decision to go for the chicken results in shock (classical conditioning) NOT "my master tells me not to go for the chicken and then I do and get shocked" you want it to be HIS choice not to go for them.