ABSTRACT The objectives of this meta-analysis were to determine to which extent phosphorus (P) digestibility and digestible P concentration in pig diets were increased by phytase supplementation and to quantify factors that potentially influence effects of phytase supplementation. A data set with a total of 547 data lines was compiled from 88 experiments published in 74 peer-reviewed papers between 2007 and April 2019. An exponential model was determined as more suitable to describe the response of P digestibility to phytase supplementation than a polynomial model. Phytase supplementation increased P digestibility by 25.6 percentage points (standard error (SE) = 1.54) to a plateau at 64.9% (SE = 1.82). The digestible P concentration was increased by phytase supplementation in the order of 1.01 g/kg (SE = 0.102) to a plateau at 2.62 g/kg (SE = 0.122). Goodness-of-fit criteria were R2 = 0.780 and root mean square error = 7.55% for P digestibility, and R2 = 0.691 and root mean square error = 0.48 g/kg for digestible P concentration. Consideration of further factors such as mineral P supplementation (yes or no), ad libitum vs. restrictive feeding, mixed diets vs. single feed ingredients, sex and age of pigs did not increase the accuracy of prediction in this data set. Some of these traits exhibited responses, but they likely are artefacts generated through the imbalanced structure of the data set. Effects of dietary total P, phytate (InsP6), InsP6-P to total P ratio, and Ca on the effect of supplemented phytase were not quantifiable. The present meta-analysis showed that responses to phytase supplementation can be well predicted although variation in P digestibility and digestible P concentration in the data set was high. Overall, predicted effects of phytase on P digestibility well corresponded to predictions made 25 years ago.

中文翻译：

---

添加微生物植酸酶对猪磷消化率的影响：荟萃分析

摘要 本荟萃分析的目的是确定添加植酸酶对猪日粮中磷 (P) 消化率和可消化磷浓度的增加程度，并量化可能影响添加植酸酶效果的因素。从 2007 年至 2019 年 4 月期间发表的 74 篇同行评审论文中发表的 88 次实验汇编了总共 547 条数据线的数据集。 确定指数模型比多项式模型更适合描述 P 消化率对植酸酶补充的响应. 添加植酸酶后，磷的消化率提高了 25.6 个百分点（标准误差 (SE) = 1.54），达到了 64.9%（SE = 1.82）的稳定水平。可消化磷浓度通过添加植酸酶以 1.01 g/kg (SE = 0.102) 的数量级增加到 2.62 g/kg (SE = 0. 122)。拟合优度标准是 P 消化率的 R2 = 0.780 和均方根误差 = 7.55%，可消化 P 浓度的 R2 = 0.691 和均方根误差 = 0.48 g/kg。考虑其他因素，如补充矿物质磷（是或否）、随意与限制性饲喂、混合日粮与单一饲料成分、猪的性别和年龄，并没有提高该数据集中预测的准确性。其中一些特征表现出反应，但它们可能是通过数据集的不平衡结构产生的人工制品。日粮总磷、植酸 (InsP6)、InsP6-P 与总磷的比例以及钙对补充植酸酶的影响无法量化。目前的荟萃分析表明，尽管数据集中磷消化率和可消化磷浓度的变化很大，但可以很好地预测对植酸酶补充的反应。总体而言，植酸酶对磷消化率的预测影响与 25 年前的预测完全一致。