Han Y M, Yang F, Zhou A G, Miller E R, Ku P K, Hogberg M G, Lei X G
Institute of Animal Nutrition, Sichuan Agricultural University, Yaan, Sichuan, China.
J Anim Sci. 1997 Apr;75(4):1017-25. doi: 10.2527/1997.7541017x.
This experiment was conducted to measure the nutritional and metabolic responses of pigs fed diets with continuous supplementation of microbial and cereal phytase from weaning to finishing, and to determine the feasibility of complete replacement of inorganic P addition by supplemental phytase in swine diets. Forty-eight Landrace x Hampshire x Meishan pigs were divided into four groups. In phase 1 (10 to 50 kg BW), pigs in Groups 1, 2, 3, and 4 were fed a low-P, corn-soybean meal basal diet (BD), the BD plus microbial phytase (A. ficuum) at 1,200 units/kg, the BD plus 10% wheat bran (230 units of cereal phytase/kg), and the BD + .24% inorganic P (calcium phosphate), respectively. In phase 2 (51 to 90 kg BW), these pigs were fed a similar BD or the BD plus 1,000 microbial phytase units/kg, 20% wheat bran, or .20% inorganic P, respectively. Repeated measures included growth performance, P, Ca, and N balance, metatarsal and metacarpal bone strength, serum concentration of inorganic P, Ca, and 1,25-dihydroxycholecalciferol, and serum alkaline phosphatase activity. Pigs fed the BD supplemented with microbial phytase and pigs fed the BD supplemented with inorganic P showed almost identical responses for all variables. Pigs fed the BD supplemented with cereal phytase also had responses for various measures that were similar to those of pigs fed microbial phytase or inorganic P, except for some differences in serum inorganic P concentrations and bone strength in phase 1. Because of improvements in apparent digestibility of dietary P and N, fecal excretion of these two nutrients was reduced by 31 to 62% (P < .05) in pigs fed the BD supplemented with phytase compared with pigs fed inorganic P. It is physiologically feasible and environmentally advantageous to replace inorganic P with microbial or cereal phytase in corn-soybean meal diets for this type of pig through the entire growing-finishing period.
本试验旨在测定从断奶至育肥阶段持续添加微生物植酸酶和谷物植酸酶的猪的营养和代谢反应，并确定在猪日粮中用添加的植酸酶完全替代无机磷添加的可行性。48头长白×汉普夏×梅山猪被分为四组。在第1阶段（体重10至50千克），第1、2、3和4组的猪分别饲喂低磷玉米 - 豆粕基础日粮（BD）、添加1200单位/千克微生物植酸酶（黑曲霉）的BD、添加10%麦麸（230单位谷物植酸酶/千克）的BD以及添加0.24%无机磷（磷酸钙）的BD。在第2阶段（体重51至90千克），这些猪分别饲喂类似的BD或添加1000单位/千克微生物植酸酶、20%麦麸或0.20%无机磷的BD。重复测量指标包括生长性能、磷、钙和氮平衡、跖骨和掌骨强度、血清无机磷、钙和1,25 - 二羟胆钙化醇浓度以及血清碱性磷酸酶活性。饲喂添加微生物植酸酶的BD的猪和饲喂添加无机磷的BD的猪在所有变量上表现出几乎相同的反应。饲喂添加谷物植酸酶的BD的猪在各种测量指标上的反应也与饲喂微生物植酸酶或无机磷的猪相似，除了第1阶段血清无机磷浓度和骨强度存在一些差异。由于日粮中磷和氮表观消化率的提高，与饲喂无机磷的猪相比，饲喂添加植酸酶的BD的猪这两种营养素的粪便排泄量减少了31%至62%（P < 0.05）。在整个生长育肥期，用微生物或谷物植酸酶替代玉米 - 豆粕日粮中的无机磷对这类猪在生理上是可行的，且对环境有利。
