Research is being done to determine whether the use of phytogenics in place of growth factor antibiotics is beneficial or not for animals (especially monogastrics)
I think the effect exist, and for many, the effect is positive. We performed studies on citrus extract on broiler gut and we observed a positive effect. Either on villi length and the whole intestine volume. This may explain the positive effects observed on the zootechnical performances of citrus extract supplementation in broiler chicken feed.
Thank you for your opinion. Indeed, most scientific researchs has shown, the effect on the digestive mucosa. Unfortunately other phytogenics gave no results.