Abstract
This study has been applied on broilers which were given vaccine prepared from sporulated oocyst of E. tenella that attenuated by X-ray (10, 15, and 20) K rad, in its 1st day with dose 1×104oocyt/bird orally; Levamisole was used as an immunomodulator with 15mg/kg- body weight gains during 4 days after vaccination. Broilers were divided to 8 groups challenging was performed in 22 days of the immunized groups and 7thgroup by sporulated oocyst 6×104oocyst/bird. After challenge recording the quantity of the consumed feed, weight gains, and some immune examinations were also applied like: Phagocytes, delayed hypersensitivity test and organ index.
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