Changing title is long-term what I think is best to tackle problem. In the end, dogs used specifically for poultry will still be classified as livestock guarding dogs, regardless of breeding, but those used for sheep and goats may need to be called sheep / goat dogs which they used to be called by many. I have always been in the camp that no dog breed was developed specifically for guarding chickens (records of my postings will support that here) although many have had that as part of there varied set of responsibilities (i.e. English Sheep Dog in U.S.). Since interest has been renewed in the raising of chickens under free-range conditions, dogs may again become important for that. Certainly the larger Molossers have some of the size and aggressive attributes for such a vocation but they may not be optimal for poultry flocks were dispersion and flock motility set poultry apart from sheep and goats. Most free-range keepers will be using some sort of confinement that potentially restricts a guard dog's movement or at least makes it's job more complex. Additionally, predators that target poultry will be different in respect to their options when countering a guarding dog's efforts that would otherwise target sheep or goats.
We need to start identifying characteristics of dogs well suited for protecting poultry and that make require as little snobbery on our part. I have been playing this game for a while and gotten to see some things that work very well. I also like dogs that are flexible in what they can do. Speed, smarts, good carrying voice but barking only when threat is close, and ability to tend with heavy brush are first concerns.
In the end some sort of cross involving a Molosser type dog may be involved but so will be selection for standardizing of performance (I do not say looks), Bad hips and heat stress need to be considered for dogs that need to be actively patrolling dispersed charges and also exhibit some bonding to the charges as well.