植酸酶对肉鸭屠宰性能及血清学指标的影响

Effect of Phytase on Plasma Indexes and Slaughter Performance in Meat-strain Ducks

试验选用600只樱桃谷肉鸭,随机分为5组,分别为I组(正对照组,饲喂基础日粮),Ⅱ组(负对照组,有效磷水平降低,未添加植酸酶),III组(负对照+500U/kg植酸酶),IV组(负对照+1000U/kg植酸酶)及Ⅴ组(负对照+10 000U/kg植酸酶),每组6个重复,研究植酸酶对肉鸭屠宰性能及血清学指标的影响。结果表明:(1)与负对照Ⅱ组相比,Ⅳ组21日龄肉鸭血清BUN及42日龄UA水平分别降低41.74%与7.92%,而Ⅳ、Ⅴ组42日龄肉鸭的TP含量分别提高15.55%和15.45%(P<0.05);(2)与Ⅱ组相比,试验Ⅲ、Ⅳ、Ⅴ组屠宰率、半净膛重、全净膛重、全净膛率、胸肌率和腿肌率均有提高趋势(P>0.05);(3)与Ⅰ组相比,Ⅱ组21日龄肉鸭肝脏重显著提高17.60%(P<0.05);Ⅱ组42日龄肉鸭肝脏指数分别比Ⅰ、Ⅳ、Ⅴ组提高25.71%、26.02%和29.04%(P<0.05)。结果表明,日粮中添加植酸酶可不同程度提高肉鸭蛋白沉积,促进器官发育,提高屠宰性能,以1000U/kg添加水平效果最佳。

The trial was conducted to determine the effects of phytase on the plasma indexes and slaughter performance in meat-strain ducks. Six hundred healthy ducklings of 1-day-old were randomly divided into five groups with six replicates and twenty ducks in each replicate. The dietary treatments were as follows： Ⅰ） Basic diet without phytase as positive control group; Ⅱ） Basic diet with reduced total P （TP） as negative control group; Ⅲ） Diet Ⅱ plus 500 phytase U/kg of diet; Ⅳ） Diet Ⅱ plus 1000 phytase U/kg of diet; Ⅴ） Diet Ⅱ plus 10,000 phytase U/kg of diet. The results showed that： （1） BUN of 21d meat-strain ducks and UA of 42d contents in group IV were significantly decreased compared with group Ⅱ （ P 〈 0. 05 ）; TP level of 42d in group Ⅳ and V was significantly increased by 15.55% and 15.45% respectively compared to that in group Ⅱ. （2） Compared with group Ⅱ, the slaughter performance of meatstrain ducks in group Ⅲ, Ⅳ and Ⅴ were all improved （ P 〉 0.05 ）. （3） At 21d, the weight of liver in group Ⅱ was significantly higher than that in group Ⅰ, while at 42d, the liver indexes of ducks in group Ⅰ , Ⅳ, Ⅴ were notably decreased compared with group Ⅱ （ P 〈 0.05 ）. Thus, phytase supplemented in the pellet diets of duck could improve the plasma indexes and slaughter performance, and it had the best effects at the dosage of 1000U/kg.