Superdosing phytase reduces real-time gastric pH in broilers and weaned piglets
Superdosing phytase reduces real-time gastric pH in broilers and weaned piglets
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DOI：
10.1080/00071668.2018.1440379
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发表时间：
2018-01-01
影响因子：
2
通讯作者：
Bedford, M. R.
中科院分区：
文献类型：
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作者：
Lee, S. A.;Dunne, J.;Bedford, M. R.
1. 本研究旨在研究高植酸酶剂量对肉鸡和猪生长性能和实时胃部pH值测量的影响。2．在第一个实验中，576 只雄性 Ross 308 肉鸡分两个阶段（0-21 天和 21-42 天）饲喂 4 个处理组，日粮中含有 0、500、1500 或 2500 FTU/kg 植酸酶，满足营养需求。在第二个实验中，64 只长白断奶仔猪分两个阶段（0-21 天和 21-42 天）饲喂满足营养需求的日粮，含或不含植酸酶（0 或 2500 FTU/kg）。海德堡pH胶囊被施用于每个治疗组的7只肉鸡和大约13头猪，在阶段变化之前和之后，并在几个小时内监测读数。3。在充足的钙和磷日粮中添加植酸酶对肉鸡生产性能没有显着影响，尽管植酸酶在整个实验期间倾向于提高猪的饲料转化率（P < 0.07）。肉鸡的实时 pH 胶囊读数表明，当植酸酶剂量为 500 或 1500 FTU/kg 时，砂囊 pH 值增加 (P < 0.05)，而较高剂量的 2500 FTU/kg 植酸酶将 pH 值降低至与对照鸡相当的水平。当动物经历饮食阶段变化时，胃部 pH 值增加（P < 0.01），这表明营养物质消化率面临潜在的挑战期。然而，饲喂 2500 FTU/kg 的猪能够通过日粮阶段变化维持胃部 pH 水平。相反，矛尖探针测量显示对胃pH.4没有治疗效果。这些发现证明了饮食对胃 pH 值的控制以及实时 pH 胶囊技术作为确定植酸酶剂量反应的手段的价值。
1. The current study was conducted to investigate the effect of high phytase doses on growth performance and real-time gastric pH measurements in broiler chickens and pigs.2. In the first experiment, 576 male Ross 308 broilers were fed in two phases (0-21 and 21-42 d) with 4 treatment groups, with diets meeting nutrient requirements containing 0, 500, 1500 or 2500 FTU/kg phytase. In the second, 64 Landrace weaners were fed on diets meeting nutrient requirements with or without phytase (0 or 2500 FTU/kg) in two phases (0-21 and 21-42 d). Heidelberg pH capsules were administered to 7 broilers and approximately 13 pigs per treatment group, pre- and post-phase change, with readings monitored over several hours.3. Addition of phytase into an adequate Ca and P diet had no significant effect on broiler performance although phytase tended (P < 0.07) to improve feed conversion in pigs over the entire experimental period. Real-time pH capsule readings in broilers demonstrated an increase (P < 0.05) in gizzard pH when phytase was dosed at 500 or 1500 FTU/kg, while higher doses of 2500 FTU/kg phytase lowered pH to a level comparable to control birds. Gastric pH increased (P < 0.01) when animals were exposed to dietary phase change, signifying a potential challenge period for nutrient digestibility. However, pigs fed 2500 FTU/kg were able to maintain gastric pH levels through diet phase change. In contrast, spear tip probe measurements showed no treatment effect on gastric pH.4. These findings demonstrate dietary manipulation of gastric pH and the value of real-time pH capsule technology as a means of determining phytase dose response.