Fig. 6From: Dietary oregano essential oil supplementation improves intestinal functions and alters gut microbiota in late-phase laying hensProposed functions of essential oil in late-phase laying hens. Items with a red up-arrow indicated the increased bacteria, activity of digestive enzyme, villus height to crypt depth ratio or mucosal gene expression in the essential oil-supplemented group compared to the control, whereas those with a green down-arrow indicated the decreased ones in the essential oil-supplemented groupBack to article page