Effect of A on some productive, physiological and histological traits of the local ducks (Anaspater hycous)‎

الملخص EN

Ninety, one old local duckling that weighed 50 g were randomly divided into 3 groups with 3 replicates per treatment.

The aim of this study was to investigate the influence of increased vitamin A levels on the production performance, some physiological traits and 2Thistological characteristics2T .

Supplemental levels were : 4000, 8000 IU and 0 vitamin A dissolved in sunflower oil 2Twas given directly into the mouth via syringe for twice during the first week after hatch .

Vitamin A levels had no significant (P < 0.05) effect on feed intake and relative heart and liver weight .

Supplemented with 8000 IU vitamin A increased the body weight and weight gain significantly (P < 0.05) and improved feed conversion ratio more than supplemented with 0 IU vitamin A .2T The influence of vitamin A 8000IU on hemoglobin concentration , PCV and erythrocyte count was significantly increased (P < 0.05) (P < 0.01) respectively at 7 weeks2T of age.

But had no significant (P < 0.05) effect on the percentage of lymphocytes , granular and monocytes cells .

In addition, vitamin A had no significant (P < 0.05) effect on serum thyroxin hormone , glucose and cholesterol levels .

Histological study showed that villi height , crypt depth were increased as vitamin A supplement increased (4000 , 8000 IU) .

In conclusion, feed supplemented ducks with 8000 IU vitamin A led to better growth rate and better performance of local ducks.