I've had 2 outstanding chicken dogs. First was a free lab/Australian shepherd puppy. Born on a farm with chickens to a hunting momma. Did not spend 10 minutes having to train her. Could stand her ground with coyotes but was better at alerting the male dog and sending him in. Second was a lab/ GP pound puppy. Raised with mean geese. Had some ADHD issues with humans until he was about 3. Could hold his own against 5 coyotes, never touched a feather on any chicken and again zero training. Both dogs had 80 acres to patrol. Yes I would lose a few every year but that's the price of free ranging. They saved many more than they lost.
Don't get hung up on a specific LGD. There are many good chicken dogs out there. Most LGD breeds are challenging to train, are wired differently (roam, not food or people driven), require quality fencing, are expensive to feed, are super sized (my female Akbash is 126#) and therefore will be short lived. Most alert, active, 75# family friendly dog can do the job. They won't be crazy about sleeping out in the middle of a snow storm but who is? Oh yeah, my dog.