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首页> 外文期刊>World's Poultry Science journal >Effect of phytase on protein and amino acid digestibility and energyutilisation [Review]
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Effect of phytase on protein and amino acid digestibility and energyutilisation [Review]

机译：植酸酶对蛋白质和氨基酸消化率和能量利用的影响[综述]

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Phytate is a molecule rich in phosphorus (P). However, the P in phytate is of low availability to monogastric animals because they lack the proper enzyme system to hydrolyse phytate. Consequently, there is a high P concentration in the manure from animals fed on diets containing phytate, and this can lead to pollution of the environment. Because phytate can complex with minerals, starch, proteins and digestive enzymes, it also has anti-nutritional properties. Limiting the P output by monogastric animals, by increasing the digestibility (availability) of the P in the diet by hydrolysing phosphate from phytate, was the original reason for developing the microbial phytase, Natuphos (R). It has been shown in many studies that P excretion by pigs and poultry can be reduced by 30% by including phytase in their diets. The digestibility of other nutrients bound to phytate can also be increased considerably by hydrolysis of the phytate molecule by phytase. A number of studies have been performed in poultry and pigs to determine the effect on amino acid digestibility of adding microbial phytase to the feed. In general, an increase of 1-3% has been reported. It was shown by meta-analysis that these improvements were significant for most amino acids at a phytase supplementation rate of 500 FTU/kg diet. In piglets and broilers an improvement in performance of 1.5-3.0% was often observed when phytase was included in the diet, even if the diet met the digestible/available P requirement. This improvement in performance cannot be explained by improvements in amino acid digestibility alone. It has been suggested that there is an effect on energy utilisation as well, and this has now been confirmed in studies with poultry. To apply this information in feed compounding, matrix values are proposed for use by the industry in linear programming. Depending on many factors, feed costs can be decreased by up to EUR 3.50 (US
机译：植酸盐是富含磷（P）的分子。但是，肌醇六磷酸中的磷对单胃动物的利用率较低，因为它们缺乏适当的酶系统来水解肌醇六磷酸。因此，饲喂含肌醇六磷酸日粮的动物粪便中的磷含量很高，这可能导致环境污染。由于肌醇六磷酸可以与矿物质，淀粉，蛋白质和消化酶复合，因此还具有抗营养特性。通过从植酸中水解磷酸盐来增加日粮中磷的消化率（可利用性），限制单胃动物的磷输出是开发微生物植酸酶Natuphos（R）的最初原因。许多研究表明，通过在日粮中添加植酸酶可以使猪和家禽的磷排泄减少30％。通过肌醇六磷酸酶水解肌醇六磷酸分子，还可以显着提高与肌醇六磷酸结合的其他养分的消化率。在家禽和猪中进行了许多研究，以确定在饲料中添加微生物植酸酶对氨基酸消化率的影响。一般而言，据报道增加了1-3％。荟萃分析表明，在植酸酶补充量为500 FTU / kg日粮的情况下，这些改善对大多数氨基酸都是显着的。在日粮中添加植酸酶时，即使日粮满足可消化/可利用的磷需求，在仔猪和肉鸡中也经常观察到性能提高1.5-3.0％。不能仅靠氨基酸消化率的改善来解释性能的改善。有人提出，能量利用也会受到影响，目前在家禽研究中已得到证实。为了将这些信息应用于饲料配料中，建议将矩阵值用于线性编程中。根据许多因素，饲料成本最多可降低3.50欧元（美国

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