不同能量和非植酸磷水平下植酸酶对肉仔鸡生产性能和胫骨矿化的影响

试验选用640只1日龄爱拔益加(AA)肉仔鸡公雏,采用2×2×2因子设计,通过在不同能量水平(11.90、11.70 MJ/kg)和非植酸磷(NPP)水平(0~3周0.35%,0.25%;3~6周0.30%,0.20%)的肉鸡饲粮中添加植酸酶0、500 FTU/kg,考察了植酸酶对肉鸡生产性能和胫骨矿化的影响。试验共8个处理,每个处理8个重复,每个重复10只鸡,试验期42 d。结果表明:(1)饲粮添加植酸酶降低了肉仔鸡前期的平均日采食量(ADFI)和全期的料重比(F/G)(P<0.05),分别下降2.52%、1.81%;降低了前期胫骨灰分(P<0.05)、后期胫骨Ca(P<0.05)和P含量(P<0.01);但对日增重无显著影响(P>0.05)。(2)植酸酶与饲粮能量和NPP水平对生产性能没有显著的交互作用(P>0.05);植酸酶和能量对前期胫骨Ca、P和后期胫骨Ca含量存在极显著的交互作用(P<0.01),表现为低能加酶组前后期胫骨Ca含量极显著高于低能组,但前期胫骨P含量极显著低于低能组。结论:以生产性能为标识,本试验条件下低磷或低能或低磷低能日粮添加植酸酶可以获得和对照组相似的生产性能。

Effects of Phytase at Different Levels of Energy and Non-phytate-phosphorus on Performance and Tibial Mineralization of Broilers

A trial of 2×2×2 factorial design was conducted to evaluate the effects of phytase at the level of 0,500 FTU/kg added in the broiler diets with different energy levels (11.90, 11.70 MJ/kg) and different NNP levels (0.35%, 0.25%) on growth performance and tibial mineralization. A total of 640 arbor acres (AA) broilers at 1 d age were allotted into 8 treatments with 8 replicates of 10 birds each. Experiment was divided into 2 periods which lasted 7 weeks. The results indicated that: (1) In diets with phytase supplementation, ADFI of first period was decreased by 2.52% (P＜0.05) and F/G of whole period was decreased by 1.81% (P＜0.05) ; the contents of tibial ash (P＜0.05) in the first period, tibial Ca (P＜0.05) and P (P＜0.01) in the last period were all decreased. But phytase did not exhibit significant influence on ADG (P＞0.05). (2) Phytase and the levels of energy, NNP in diet did not have significant interaction (P＞0.05) on broiler growth performance; phytase and energy had significant interaction (P＜0.01) on the contents of tibial Ca, P in the first period and tibial Ca in the last period. The content of tibial Ca of two periods in low-energy treatment added phytase were significantly higher(P＜0.01), but the content of tibial P in first period significantly lower (P ＜ 0.01) than low-energy treatment. Conclusion: In the point of growth performance, low-P or low-energy or low-P-energy diet with phytase can get the similar performance with the control treatment.