Kies A K, Kemme P A, Sebek L B J, van Diepen J Th M, Jongbloed A W
DSM Food Specialties, R&D-FTD, 2600 MA Delft, The Netherlands.
J Anim Sci. 2006 May;84(5):1169-75. doi: 10.2527/2006.8451169x.
An experiment with 224 weaner pigs (initial BW of 7.8 kg) was conducted to determine the effect of dose of dietary phytase supplementation on apparent fecal digestibility of minerals (P, Ca, Mg, Na, K, and Cu) and on performance. Four blocks, each with 8 pens of 7 pigs, were formed. Eight dietary treatments were applied to each block in the 43-d experiment: supplementation of 0 (basal diet), 100, 250, 500, 750, 1,500, or 15,000 phytase units (FTU) or of 1.5 g of digestible P (dP; monocalcium phosphate; positive control) per kilogram of feed. The basal diet, with corn, barley, soybean meal, and sunflower seed meal as the main components, contained 1.2 g of dP per kilogram of feed. Fresh fecal grab samples were collected in wk 4 and 5 of the experiment. Average daily feed intake, ADG, G:F, and digestibility of all of the minerals increased (P < 0.001) with increasing phytase dose. Digestibility of P increased from 34% in the basal diet to a maximum of 84% in the diet supplemented with 15,000 FTU, generating 1.76 g of dP per kilogram of feed. At this level, 85% of the phytate phosphorus was digested, compared with 15% in the basal diet. Compared with the basal diet, digestibility of the monovalent minerals increased maximally at 15,000 FTU, from 81 to 92% (Na) and from 76 to 86% (K). In conclusion, phytase supplementation up to a level of 15,000 FTU/kg of a dP-deficient diet improved performance of weaner pigs and digestibility of minerals, including monovalent minerals. Up to 85% of the phytate-P was digested. Thus, dietary phytase supplementation beyond present day standards (500 FTU/kg) could further improve mineral use and consequently reduce mineral output to the environment.
用224头断奶仔猪（初始体重7.8千克）进行了一项试验，以确定日粮中添加植酸酶剂量对矿物质（磷、钙、镁、钠、钾和铜）的表观粪便消化率及生产性能的影响。试验形成了4个区组，每个区组有8个栏，每栏7头猪。在为期43天的试验中，每个区组采用8种日粮处理：每千克饲料添加0（基础日粮）、100、250、500、750、1500或15000个植酸酶单位（FTU），或添加1.5克可消化磷（dP；磷酸二氢钙；阳性对照）。基础日粮以玉米、大麦、豆粕和葵花籽粕为主要成分，每千克饲料含1.2克dP。在试验的第4周和第5周采集新鲜粪便抓样。随着植酸酶剂量增加，所有矿物质的平均日采食量、平均日增重、料重比和消化率均升高（P<0.001）。磷的消化率从基础日粮中的34%提高到添加15000 FTU日粮中的最高84%，每千克饲料产生1.76克dP。在此水平下，85%的植酸磷被消化，而基础日粮中为15%。与基础日粮相比，单价矿物质的消化率在15000 FTU时提高最大，钠从81%提高到92%，钾从76%提高到86%。总之，在缺磷日粮中添加高达15000 FTU/kg的植酸酶可提高断奶仔猪的生产性能和矿物质消化率，包括单价矿物质。高达85%的植酸磷被消化。因此，日粮中添加超过目前标准（500 FTU/kg）的植酸酶可进一步提高矿物质利用率，从而减少向环境中的矿物质排放。
