This study was conducted to investigate the effects of vitamin A supplemental level on growth performance, vitamin A content and antioxidantive capacity in serum and liver of yellow-feathered broilers aged from 22 to 42 days. One thousand four hundred and forty male broilers aged 22 days were randomly assigned into six treatments. Each treatment consisted of five replicates with 40 birds. Supplemental levels of vitamin A in a basal diet were 0 (control), 750, 1 500, 3 000, 6 000 and 12 000 IU/kg, respectively. Feed and water were provided ad libitum for a period of 21 d. The results showed as follows: 1) dietary supplementation of vitamin A significantly increased body weight and average daily gain at 42 days of age (P<0.05), and significantly decreased the ratio of feed to gain (P<0.05). Adding 1 500 and 3 000 IU/kg vitamin A significantly improved average daily feed intake (P<0.05). 2) With the increasing of vitamin A supplemental level, the content of vitamin A in serum and liver was increased significantly (P<0.05), and that in 12 000 IU/kg vitamin A supplemental group was significantly higher than that in the other groups (P<0.05). Vitamin A content in serum in 3 000 and 6 000 IU/kg vitamin A supplemental groups was significantly higher than that in the other groups except for 12 000 IU/kg vitamin A supplemental group (P<0.05). Vitamin A content in 6 000 IU/kg vitamin A supplemental group was significantly higher than that in the other groups except for 12 000 IU/kg vitamin A supplemental group (P<0.05). 3) Supplementation of vitamin A at levels of 1 500, 3 000 and 6 000 IU/kg significantly improved glutathione peroxidase (GSH-Px) activity in serum (P<0.05), and that in liver was significantly increased (P<0.05). Adding vitamin A at levels of 1 500, 3 000, 6 000 and 12 000 IU/kg in diet significantly decreased malondialdehyde (MDA) content in serum (P<0.05), and that in liver in 3 000 IU/kg vitamin A supplemental group was significantly decreased (P<0.05). These results indicate that dietary vitamin A from 3 000 to 6 000 IU/kg can maintain the stable content of vitamin A in serum, increase antioxidantive capacity and improve growth performance of broilers aged from 22 to 42 days.
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