Many suggestons come from reserch resuts and production company.
I wonder if any have practical experiences to compare the effectiveness of organic acids, probiotic, prebiotic, plant bioactives, enzymes.....etc. as compared to AGP.
I my opinion antibiotics in feed for poultry are generally "performance permitters"' . In other words, if a flock does not reach its genetic potential of growth or egg production due to factors like health, hygiene, housing conditions or climate, antibiotics as well as other additives might allow the animals to compensate for some of the differences. But you can not predict reliably whether a certain flock will be an "underperformer".
Enzymes are another category. Especially young animals do not always have sufficient digestive capacity to liberate all the nutrients present in the diet and make use of them. Fytase as well as other enzymes can then improve the utilisation of the nutrient and enhance the performance of the animals.