الفهرس 
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Abstract
The present study was carried out at Mehalet Mousa Turkey Research Station, Kafr El-Sheikh, belonging to the Animal Production Research Institute, Agricultural Research Center, Ministry of Agriculture, Egypt. This experiment aimed to study the effect of using some antioxidants and methyl-donors on the productive and reproductive performance of turkeys.
Two experiments were carried out. In experiment (1), 72 Bronze male turkeys (toms), 36 weeks of age were used. The toms were randomly distributed into 8 experimental groups, each consisted of three equal replications. Toms of each experimental group were maintained in three floor pens. In experiment (2), 168 Bronze female turkeys, 36 weeks of age were used. The birds were randomly distributed into 8 experimental groups, each consisted of three equal replications. The birds were individually housed in battery cages. The experimental period lasted 12 weeks (from 36 to 48 weeks of age). The birds were fed a basal yellow corn-soybean meal basal diet, supplemented with feed additives.
Results obtained could be summarized as follows:
-Final body weight, body weight change and feed conversion rate of turkey toms were not affected by treatments during the experimental period from 36-48 weeks of age .
-Choline supplementation significantly increased (P0.05) final body weight of turkey hens as compared to that of the controls. While, the other experimental groups turkey hens exhibited significantly lower (P0.05) final body weight at 48 weeks of age.
-Body weight change of turkey hens was not significantly affected by dietary treatments during the experimental period from 36-48 weeks of age .
-Feed intake was significantly increased (P0.05) by vitamin C plus vitamin E supplementation of turkey toms and hens as compared to those of the controls.
-Vitamin E supplementation alone significantly improved (P0.05) feed conversion rate of turkey hens as compared to that of the controls.
-Hen-day egg production rate was significantly increased (P0.05) of hens fed diet supplemented with vitamin E, followed by that of hens fed diet supplemented with vitamin C plus vitamin E as compared to that of the controls during the experimental period from 36-48 weeks of age .
CONCLUSION
It can be concluded that dietary supplementation with vitamin E alone at a level of 250 mg/kg diet and dietary supplementation with a mixture of vitamin C at 200 mg/kg + vitamin E at 250 mg/kg + choline at 2.25 g/kg can induce beneficial effects on productive and reproductive performance of turkeys.