Some of us have been involved in this for a good while and by default have used dogs inherently with high prey drive. Such dogs often have a have a primary use totally unrelated to poultry although that does not rule out non-aggressive interactions. A good hunting or guard dog does not have to kill a chicken when opportunity presents itself in order to be good at its primary use. When many are used for hunting, even for birds, the dogs need to stay after proper game and not go on trash. For dogs I am used to using; poultry, deer, and mice are trash so they are expected to be ignored. Dogs that go after trash need further training and if you are not able to get job done then you get rid of dog or give up on its ability as a hunter. Genetics are a factor but the trainers abilities are at least as important. The training is also not just some generic skill. Training for different activities especially involving other animals involves different type of effort than involved with obedience, showing, and being aggressive to humans and each of those latter activities are also different.
Get control over you dogs so they can slow down and control their instincts.
Get control over you dogs so they can slow down and control their instincts.