The use of grape seed-, olive leaf- and pomegranate peel-extracts as alternative natural antimicrobial feed additives in broiler diets

Summary The study was conducted to investigate the effects of the grape seed-, olive leaf- and pomegranate peel-extract supplementation to diets on performance, serum lipid profile and ileum bacteria content of broilers at 42 d of age. The diets were as follows: a basal diet (CONT) which contained no feed additive, a diet supplemented with either a probiotic (Protexin TM) (P), oleuropein (as olive leaf extract) (OLE100 and OLE200), proanthocyanidin (as grape seed extract) (GSE100 and GSE200) and proanthocyanidin (as pomegranate peel extract) (PPE100 and PPE200) at two levels of 100 and 200 mg/kg.