Department of Animal Sciences, Purdue University, West Lafayette, Indiana, USA.
Anim Sci J. 2009 Jun;80(3):296-304. doi: 10.1111/j.1740-0929.2009.00631.x.
Three experiments were conducted to compare the excretion of water-soluble phosphorus (P) of starter, grower, and finisher pigs fed corn-soybean meal-based P-deficient basal diet containing no added inorganic P (B), P-adequate diet (the basal diet with added dicalcium phosphate; B + P), the basal diet plus 500 units of microbial phytase/kg (B + 500), or the basal diet plus 1000 units of microbial phytase/kg (B + 1000). There were 6 barrows per diet, in a randomized complete block design, with an average initial body weight of 10.4, 20.0, or 51.1 kg for each of starter, grower, and finisher pigs in the three phosphorus balance experiments, respectively. In the experiments, the addition of dicalcium phosphate or phytase to the basal diet increased (P < 0.05) the digestibility and retention of P, and there were linear reductions (P < 0.05) in water-soluble P excretion as a result of supplementing the basal diet with phytase. In the starter pig experiment, phytase addition at 500 or 1000 units/kg reduced (P < 0.05) water-soluble P excretion by 28 or 42%, respectively when compared with the B + P diet. In the grower pig experiment, adding phytase at 500 or 1000 units/kg reduced (P < 0.05) water-soluble P excretion by 24 or 34%, respectively when compared with the B + P diet. The use of phytase at 500 or 1000 units/kg reduced (P < 0.05) water-soluble P excretion by 11 or 30%, respectively in the finisher pig experiment. The proportion of water-soluble phosphorus in total phosphorus was not affected by dietary treatment in any of the three experiments. In conclusion, adding phytase at 1000 units/kg to a corn-soybean meal-based P-deficient diet basal diet containing no added inorganic P compared with B + P diet reduced the daily excretion of water-soluble P in starter, grower, and finisher pigs by 42, 34, and 30%, respectively.
进行了三项实验，比较了饲喂以玉米-豆粕为基础且不含添加无机磷（B）的磷缺乏日粮、磷充足日粮（基础日粮添加磷酸二钙；B+P）、基础日粮添加 500 单位微生物植酸酶/千克（B+500）或 1000 单位微生物植酸酶/千克（B+1000）时，处于生长期、育肥期和育肥后期的猪的水溶性磷（P）排泄量。在这三项磷平衡实验中，每个处理组有 6 头阉公猪，采用完全随机区组设计，生长期、育肥期和育肥后期猪的初始体重分别为 10.4、20.0 和 51.1kg。在实验中，向基础日粮中添加磷酸二钙或植酸酶增加（P<0.05）了磷的消化率和存留率，并且由于基础日粮中添加了植酸酶，水溶性 P 的排泄量呈线性减少（P<0.05）。在生长期猪实验中，与 B+P 日粮相比，添加 500 或 1000 单位/千克的植酸酶分别减少（P<0.05）了 28%或 42%的水溶性 P 排泄量。在育肥期猪实验中，添加 500 或 1000 单位/千克的植酸酶分别减少（P<0.05）了 24%或 34%的水溶性 P 排泄量。在育肥后期猪实验中，添加 500 或 1000 单位/千克的植酸酶分别减少（P<0.05）了 11%或 30%的水溶性 P 排泄量。在这三项实验中，日粮处理均未影响总磷中的水溶性磷比例。总之，与 B+P 日粮相比，在不含添加无机磷的以玉米-豆粕为基础的磷缺乏日粮中添加 1000 单位/千克的植酸酶减少了生长期、育肥期和育肥后期猪的日水溶性 P 排泄量 42%、34%和 30%。
