الفهرس 
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Abstract
This study was designed to determine the physiological effects of addition Eltroxine in diets of Sinai laying hens at level of 0.0, 40, 60 or 80µg/ El./ kg diet. The experiment was repeated during winter and summer season at two different ages (22 or 42 weeks) . Results revealed that the level of 40 mg Eltroxine had significantly increased the body weight, eggs number and egg mass chick weight at hatch and plasma alkaline phosphatase level , while these traits adversely affected at level of 80 µg/ kg diet. Plasma T4 level was significantly increased compared with the control at level of 60 and 80 µg Eltroxine While , T3 was not affected at any level of Eltroxine. Applied treatments lead to increased outer and inner diameter follicle at level of 40 and 60 µg compare to the control as well as increased height and number of epithelial cells. Result of this study showed that the level of 40 mg Eltroxine has profound positive effects of some productive and reproductive performance in sinai laying hens.