Hi Richard:
In today's poultry industry, dysbiosis not only is seen in broilers but also is seen in layers (commercials and breeders) and we need a lot of steering to improve gut health in all kind of chicken. And not only the plant cell like NSP predispose the condition to change the microbiota but also the structure of feed, anti nutrient and biogenic amine do it also and foregut formation in early age and their ability to prepare the nutrient to be digested in hind gut is critical.
One of the major problems of dysbiosis in layers is peritonitis because of the dislocation of bacteria from intestine to peritoneum after inflammation of intestine.
Today it is clear that improvement of gut health and dysbiosis prevention is most important in poultry production but yet it seems we must know more about it and feed additives to control it.
Unfortunately, your article is not completely available to know what feed additive is more effective or combination of them as your study or research.