I use a BozShepherd/Kangal on my 300+ Acer ranch, he is socialized with ppl but his job is to protect the livestock he is with miniature cattle ,potbelly pig, free range chickens and ducks. It takes alot of work but the pay off is worth it. I sleep good at night knowing my critters are safe under his watchful eye. He will not tolerate large birds to land or wild hogs to cross into our ranch he takes his job seriously. When looking to purchase a guardian dog make sure you go to a breeder who raises the dogs AS GUARDIANS and go with livestock guardian breeds ONLY. They have been bred for 1000s of years to do the job. While many have success using there pet dogs of various breeds there has also been much heartache along with trying to use the incorrect breed..after all if you want to have a dog pull a sled your not going to use a pug , if you want a duck retrieving dog your not going to purchase a English bulldog ECT ECT ECT... Use the correct tool for the job.
No lgd bred for poultry. Other breeds have potential. No absolutes / only at this time. I and others have been doing it successfully for too long and most dogs despite current use have farmstedq guarding in their background which is much closer ideal for guarding poultry than what is done with herds for thousands of years.
I also do not peddle which can cause conflict of interest if advising.