An experiment with a 2 × 2-factorial arrangement of treatments was carried out to assess the effect of reduced feed pH and addition of phytase and their interactions on performance, mineral retention (Ca, P, Mg, Zn, Fe and Cu) and bone mineralization. A wheat-based diet with a high phytate-P content and no inorganic P added, or the same diet with either 1.4 % formic acid, 500 FTU C. braakii-derived phytase or both added, were used. Thirty-two piglets, with a mean weight of 21.06 ± 0.83 kg were distributed in eight pens. Individual feed intake was recorded, and all treatments were represented in all pens. The experimental period was 28 days. Performance was recorded, pH in stomach, jejunum and ileum was measured and content from jejunum and ileum was collected for assessment of P digestibility. In addition, feces were collected for total digestibility measurements and left third and fourth metacarpal were analyzed for bone mineralization. No interaction effects between phytase and acid addition were found. Phytase addition increased growth (P=0.046), jejunal P digestibility (P=0.004), total tract digestibility of P (P<0.001) and Ca (P<0.001) and bone mineralization (P<0.001). Acid addition improved growth (P=0.002) and FCR (P=0.033) in addition to total tract digestibility of Mg (P=0.04), Fe (P<0.001) and Ca (P=0.001).

The experiment confirmed that phytase addition improved P digestibility. However, no increased phytase efficacy was seen with acid addition.

进行了2×2因子处理的实验，以评估饲料pH降低和植酸酶添加及其相互作用对生产性能，矿物质retention留（钙，磷，镁，锌，铁和铜）和骨骼的影响矿化。植酸磷含量高且不添加无机磷的基于小麦的日粮，或添加1.4％甲酸，500 FTU C.的相同日粮使用衍生的植酸酶或同时添加两者。将32头平均重量为21.06±0.83kg的仔猪分配到八只围栏中。记录个体采食量，所有处理均以所有笔表示。实验期为28天。记录性能，测量胃，空肠和回肠的pH，并收集空肠和回肠的含量以评估磷的消化率。此外，收集粪便以进行总消化率测量，并分析左掌骨和第三掌骨的骨矿化情况。没有发现植酸酶和酸添加之间的相互作用。添加植酸酶可增加生长（P = 0.046），空肠P消化率（P = 0.004），P的总消化道消化率（P <0.001）和Ca（P <0.001）和骨矿化（P <0.001）。酸的添加改善了生长（P = 0。

实验证实添加肌醇六磷酸酶可以提高磷的消化率。然而，添加酸未发现植酸酶功效增加。