Effects of different concentrations of a white grape marc extract on broiler performance, apparent ileal digestibility, antioxidant capacity, intestinal barrier function and nutrient transport markers.

The current study evaluated the effect of a white grape marc extract (GME) on growth performance, gut health, and intestinal function in broiler chickens at different dosages to determine a dose-related efficacy of the extract without inducing any adverse effects. Four hundred male broiler chickens received a basal diet without (CON) or with the GME at different levels, based on its polyphenolic concentration: 200 (LPP), 750 (MPP), and 1,500 (HPP) mg/kg, respectively. Growth performance parameters were recorded during the whole trial.