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International Journal of Poultry Science
Year: 2013  |  Volume: 12  |  Issue: 10  |  Page No.: 561 - 571

Evaluation of Some Natural Antioxidant Sources in Broiler Diets: 1-Effect on Growth, Physiological, Microbiological and Immunological Performance of Broiler Chicks

N.A. Selim, S.F. Youssef, A.F. Abdel-Salam and Sh.A. Nada    

Abstract: This study was conducted to evaluate the efficiency of aqueous extract of ginger root (GAE), aqueous extract of beetroot (BAE) and tomato puree (TP), as natural antioxidant sources, in broiler diets during summer season. Chicks fed on corn-soybean meal basal diets in three phases feeding system. Basal diets were formulated to contain whole strain nutritional requirements including 50 IU of vitamin E/kg. There were two control groups the first fed on basal diet (Con) and supplemented with either 50 IU/kg vitamin E (E-100, to be the second control group), or supplemented with GAE, BAE or TP at levels of 0.5 or 1% from 1 to 40 d of age. The total phenols content (in Gallic acid equivalent) of GAE and BAE were 44 and 31 μg/L, respectively and lycopene content in TP was 155 mg/kg. The environmental temperature and humidity surrounding birds during the experimental period ranged from 35 to 41°C and 30 to 45%. Growth performance, some plasma constituents and viral and bacterial immunity status at 40 d of age were recorded. The results indicated that, among examined natural additives, using BAE improved the overall body weight gain, while adding GAE to broiler diets decreased feed consumption significantly. However the worst feed conversion ratio recorded by TP group, that group recorded the best antioxidant status including plasma total antioxidant capacity and malondialdehyde. Generally, level 1% of supplementation increased the consumed feed and depressed the total bacteria count of intestine at 40 d of age. On the other side, titer of immunity against respiratory viral Diseases (ND and IB), hemoglobin, red and white blood cells increased by adding GAE to diets. Neither antioxidant source, level nor their interactions could change lipids or cholesterol compounds in plasma. The overall results indicated that the best overall broiler performance during summer season was obtained by using GAE at level of 1% as natural antioxidant.

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