不同锌水平对笼养育成蛋鸭生长性能及总抗氧化能力的影响

选5周龄健康金定育成蛋鸭120只,试鸭随机分为30组,每组4只鸭,采用玉米-豆粕型基础日粮,锌(ZnSO4.7H2O)添加水平依次为0,30,60,200,1 000 mg·kg-1,组成5种试验饲粮,每种饲粮饲喂6组试鸭,试验期为8周。研究饲粮中不同锌水平对育成蛋鸭生长性能、体内血清酶活性、甲状腺激素及总抗氧化能力(T-AOC)的影响。结果表明,低锌添加水平(0 mg·kg-1)对试鸭体增重、三碘甲腺原氨酸(T3)、尿酸(URIC)淀粉酶(AMY)及总抗氧化能力(T-AOC)等均产生显著不良影响,随着饲粮中锌水平的增加,试鸭体增重、三碘甲腺原氨酸(T3)、尿酸(URIC)、淀粉酶(AMY)及总抗氧化能力(T-AOC)等均不同程度的增加,但是高锌(1 000 mg·kg-1)条件下,尿酸(URIC)、淀粉酶(AMY)及总抗氧化能力(T-AOC)等均不同程度地受到抑制。综合试鸭生长性能和生化指标可以看出:蛋鸭育成阶段在饲喂玉米-豆粕型实用日粮(含锌32.9 mg·kg-1)时外加锌30 mg·kg-1可满足生长需要,适当增加日粮锌含量可增加总抗氧化能力及其它生化指标,建议蛋鸭在笼养条件下育成阶段饲粮锌的添加水平为30～60 mg·kg-1。

Effect of the level of zinc on laying ducks in cages growth and total anti-oxidant capability

The experiment was conducted to study the roles of zinc in ducks with corn-soybean meal basal diet.Total 120 healthy 5-week-old Jinding ducks were randomly divided into 30 groups.Four ducks for each group.The zinc additive levels was 0,30,60,200,1 000 mg·kg-1 in basal diet,making 5 kind diets,each kind diet for 6 group ducks.After 8 t weeks studied the influence of dietary zinc levels on growing,some important serum enzymes,thyroid gland and total anti-oxidant capability.The results showed that low level of zinc had significant bad effect on growth,three idodines armor gland original ammonia acid(T3),the uric acid(URIC),the amylase(AMY),total anti-oxidant capability(T-AOC) and so on,along with the zinc level increase,T3,URIC,AMY and T-AOC wand so on increased in varying degree,but high level of zinc(1 000 mg·kg-1),URIC,AMY and T-AOC and so on were suppressed in varying degree.Synthesize the duck growth performance and the biochemistry index,this experiment indicated that adding 30 mg·kg-1 zinc in corn-soybean meal basal diet(contain zinc 32.9 mg·kg-1) that raising laying ducks in cages can be possible to meet the growth needs,suitably increaseing zinc content in feedstuff can be possible to increase growth and total anti-oxidant capability.It is suggested that diet zinc additive level of the laying ducks is 30-60 mg·kg-1 under cage condition.