They won't learn on the end of a leash, because that's not a "normal" situation.
They need to be near the birds ALL the time, even if its just in a pen beside them.
The dogs need to learn the birds are something that's there all the time, and not a "fun toy" that they only see when you let them run around.
When you're actually training them, the dogs need to be loose and you need to be out of sight.
Use the shock collar to correct them when they chase or touch a bird.
That way they associate the correction with the bird instead of with you.
Keep in mind those dogs will be puppies for another year and a half.
They can be saved with some persistant work now
They need to be near the birds ALL the time, even if its just in a pen beside them.
The dogs need to learn the birds are something that's there all the time, and not a "fun toy" that they only see when you let them run around.
When you're actually training them, the dogs need to be loose and you need to be out of sight.
Use the shock collar to correct them when they chase or touch a bird.
That way they associate the correction with the bird instead of with you.
Keep in mind those dogs will be puppies for another year and a half.
They can be saved with some persistant work now