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| 摘要: |
| 将510只45日龄罗曼褐壳蛋鸡随机分为5个处理，每处理6个重复，每重复17只。设计5种饲粮:（1）正对照组；（2）负对照组（营养水平降低10%，钙和总磷除外）；（3）负对照组+0.02%植酸酶（降低总磷和有效磷0.05%）；（4）负对照组+0.15%益生素；（5）正对照组+0.02%植酸酶（降低总磷和有效磷0.10%）。结果表明:（1）负对照组蛋鸡生长速度与正对照组相当，但粪中干物质（P<0.05）和钙含量（P<0.01）显著提高；（2）负对照组添加植酸酶后，鸡粪磷排泄量极显著减少（P<0.01）；与正对照组相比，采食量增加（P<0.01），鸡粪钙含量提高（P<0.05）；（3）添加益生素后，蛋鸡采食量增加（P<0.01）,其余所观测指标不受影响(P>0.05)；（4）正、负对照组饲粮添加植酸酶后，磷表观代谢率分别提高30.06%（P=0.09）和29.05%（P>0.05）；（5）高麸皮饲粮组（处理2和3）与低麸皮饲粮组（处理1和5）鸡生长性能相当。 |
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| 基金项目:国家自然科学基金资助项目(39970550) |
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| Effect of phytase and probiotic on growth of 6-12 week-old chickens |
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| Abstract: |
| 510 forty-five-day-old Lomman chickens were divided into five groups randomly with six replicates and received the following treatments:(1) Positive control (PC);(2) Negative control (NC),nutritional level 10% descended except calcium and total phosphorus;(3) NC+0.02% phytase,total and available phosphorus 0.05% reduced;(4) NC+0.15% protiotic;(5) PD+0.02% phytase,total and available phosphorus 0.10% lowered.Compared with PC treatment,NC groups achieved similar growth speed,but there were more dry matter (P<0.05) and calcium content (P<0.01) in excreta.Phosphorus excrement lowered significantly (P<0.01) when phytase was added to NC diet,and at the same time feed intake and manure calcium increased (P<0.01).Probiotic didn't improve the chickens' growth,nutrient utilization or tibia length except for feed intake (P<0.01).Phytase enhanced the apparent metabolizability of phosphorus by 30.06% (P=0.09) and 29.05% (P>0.05).There were no significant differences between higher wheat-bran diets (treatment 2 and 3) and lower diets (treatment 1 and 5). |
| Key words: chicken phytase probiotic wheat bran growth performance |
