I am glad you are willing to work with them. May I make a few suggestions?
First, you are the pack leader, they need to be reminded of this. They are going through a learning period, playing with the chickens gives them practice for the future hunting skills they are developing. I would take each pup one at a time to start with, place it on a long line, and supervise closely. A well timed growled 'Leave it!' with a physical correction (if needed). Praise the instant the pup looks away from the bird and looks to you (his leader).
For this to work, though, you need the foundation. Obedience lessons, focus (Look at me), No, Leave it, Stay, etc. There are some great books out there that can give you the basics on training and canine behaviour. I recommend The Art of Raising a Puppy and How to be Your Dog's Best Friend by the Monks of New Skete.
Exercise the pups well before trying the chicken training. Tired dogs are good dogs.
Second, make sure you know your dogs and what it takes to get their attention. If I put a shock collar on either my Brenna or Coulter, I would have a disaster on my hands. It 'might' work with William and Hoppy. It has worked on Sic Puppy, but I don't recommend them as a start. The problem I see with the shock collar is youare the leader, therefore youneed to give the correction, not some inanimate object. Your dogs need to learn from and respect you, not that collar.
Training is a lifelong commintment. There are no quick fixes. Be patient, be firm, be consistant. You will impress yourself with the results.
Best wishes.
If I can help you with details, you are more than welcome to PM me. Dogs and training are a passionate hobby for me.