维生素C对热应激状态下肉仔鸡生产性能及维生素C合成能力的影响

EFFECT OF DIETARY VITAMIN C SUPPLEMENTATION ON PRODUCTION PERFORMANCE AND THE CAPACITY OF BIOSYNTHESIS OF VITAMIN C IN BROILERS UNDER HEAT STRESS

选用 2 1日龄AA肉仔鸡 2 4 0只 ,研究了热应激 (室温 32～ 35℃ ,相对湿度 80 %～ 82 % )和非应激 (室温 2 0～ 2 5℃ ,相对湿度 65%～ 70 % )状态下日粮添加维生素C对肉仔鸡生产性能和体内维生素C合成能力的影响。试验结果表明 ,肉仔鸡在应激状态下血浆维生素C含量降低 ,日粮补充 2 0 0mg/kg维生素C可以明显提高血浆维生素C含量。热应激导致肉仔鸡肝脏维生素C合成关键酶———古洛糖酸内酯氧化酶活性明显降低 ,使维生素C的合成能力减弱。日粮添加维生素C可提高应激状态下肉仔鸡肝脏古洛糖酸内酯氧化酶活性。随肉仔鸡日龄的增加 ,肉仔鸡肝脏古洛糖酸内酯氧化酶活性有上升趋势 ,表明维生素C合成能力随日龄的增加逐渐提高。

Two hundred forty four week old Arbor Acre broilers were used to study the effect of dietary vitamin C supplementation on production performance and the capacity of biosynthesis of vitamin C in broilers under heat stress (room temperature 32～35℃,humidity 80%～82%)and thermoneutral status(room temperature 20～25℃,humidity 65%～70%).The result showed that marked decline of plasma vitamin C of broilers was caused under heat stress,and supplemental vitamin C(200mg/kg)could bring plasma vitamin C back to normal.Heat stress also caused hepatic gulonolactone oxidase activity to decrease,which indicated the decrease of the capacity of biosynthesis of vitamin C in broilers.Supplemental vitamin C had a positive effect on the activity of hepatic gulonolactone oxidase under heat stress status.The results suggested that supplemental vitamin C might be beneficial to commercial broilers under heat stress.