Research Article 
Enhancement of Broiler Performance and Immune Response by -Tocopherol Supplemented In Diets
Azza A. Attia, A. E. Abou-Zeid, F. F. Mohamed and Haitham M. Yakout
Pakistan Journal of Biological Sciences, 2001, 4(8), 1029-1035.
Abstract
The impact of different levels of dietary vitamin-E supplementation on broiler production and immunity was investigated. One hundred and sixty birds were randomly assigned to four equal groups of forty birds each. Birds were fed starter and finisher diets supplemented with different levels of vitamin-E (0, 400, 800 or 1200 mg/kg diet). Statistical differences among treatments were noted for body weight at the sixth week of age, which increased significantly (P< 0.05) by elevating vitamin-E levels, while body weight gain, feed consumption and feed conversion were not influenced by dietary treatments. The white blood cells (WBC`s) counts increased significantly (P<0.001) with elevating the vitamin-E levels, whereas, the red blood cells (RBC`s), hemoglobin (Hb), mean corpuscular volume (MCV) and packed cell volume (PCV%) were not statistically affected by any of the treatments. The immunological parameters were significantly (P<0.001) affected by dietary treatments. Increasing level of vitamin-E caused certain structural alterations in thymus gland rather than bursa of Fabricius comparing to that of low levels
ASCI-ID: 1-2098
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