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This study aimed to investigate the effect of whole grape pomace (GP), grape seed (GS) and grape pomace polyphenolic extract (GPEP) on growth performance, total antioxidant status (TAS) and complete blood count (CBC) of 40-day-old chicks (hybrid Cobb 500). A total of 432 unsexed one-day-old chicks were divided into six groups: control (CON) and five experimental groups, 10 g/kg GP, 20 g/kg GP, 5 g/kg GS, 10 g/kg GS and 15 mL/L GPEP. The results showed a higher increase in growing rate in 5 g/kg GS group, from the first week of the chicks’ life throughout their growth, the average body weight of the chicks being significantly higher (p<0.01) than CON. The broilers that received 5 g/kg seeds in the diet, 10 g/kg and 20 g/kg GP respectively, have achieved a better feed conversion ratio (FCR) than CON. The introduction of GPEP in drinking water has significantly affected (p<0.05) the growth performance in the fourth week of the experiment, lower weight gains could be due to high levels of polyphenols in grape pomace extract that may have a delayed effect on the growth of chickens. The CBC and TAS were not affected by dietary treatments (p>0.05) at 40 days of age. As a conclusion, the amount of 5 g/kg seeds, 10 g/kg and 20 g/kg pomace, can be added to the diet of the broilers, the dose of 5 g/kg seeds in the diet offering advantages in growing rate and feed valorization in weight gain

Effects of Wine by-Products on Growth Performance, Complete Blood Count and Total Antioxidant Status in Broilers