【摘要】 本研究选用４８头（长白×梅山）×（汉普夏×梅山）断奶仔猪（１１．０±０．２４ｋｇ），在断奶到肥育阶段（１１～５０ｋｇ为前期，５０～９０ｋｇ为后期），研究不同来源植酸酶对植酸磷利用的影响。设４个试验处理，每试验处理设４个重复（每重复３头猪）。在玉米─豆饼基础饲粮中，分别添加微生物（Ａｓｐｅｒｇｉｌｌｕｓｎｉｇｅｒ）来源的植酸酶（ＭＰ，前期１２００ＰＵ／ｇ，后期１０００ＰＵ／ｇ），麦麸（Ｗ８，前期１０％，后期２０％）、及无机磷（前期０．３％，后期０．２％），组成４种不同的试验饲粮。试验结果表明，ＭＰ或ＷＢ使猪的生产性能达到了与添加无机磷类似的水平（Ｐ＞０．０５），明显高于对照组（Ｐ＜０．０１）．并且明显提高５０及９０ｋｇ时　　骨和掌骨的强度（Ｐ＜０．０１）。试验猪５０ｋｇ时，ＷＢ对骨骼强度的作用低于ＭＰ或无机Ｐ（Ｐ＜０．０１），但９０ｋｇ时三个处理组之间没有差异（Ｐ＞０．０５）。以上结果说明在断奶到肥育阶段，ＭＰ可以代替添加无机磷的作用，ＷＢ对生产性能的改善作用与ＭＰ和无机磷相似。ＷＢ的有益作用是由于其中含有较多的植酸酶。更多还原

【Abstract】 In order to investigate the effects of microbial phytase(MP)or wheat bran(WB)on the phytate phosphorus availability48(Landrace × Meishan)×(Hampshire × Meishan)piglets were used in a feeding trial from 11.0(±0.24kg)to 90kg BW,with 11 to 50kg,50 to 90 as phase 1 and phase 2,respectively.The corn-soybean meal basal diet(0.34%total P)was supplemented with 1200(phase 1)and 1000(phase2) PU/g MP,10(phase 1)and 20%(phase2)WB,or 0.3(phase 1)and 0.2%(phase2)inorganicP(IP),respectively.Each diet was provided to 4 replicates of pigs(3/pen).The pigswere access to diets and water ad libitum.SupplementaI MP,WB,or IP significantly increased the average daily gain andfeed intake of the pigs(P<0.01),with no obvious difference among the threeexperimental diets(P>0.05).The bone strength(BS) of the metatarsi and metacarpiof the pigs at both 50 and 90 kg BW was also enhanced(P<0.01).Although the pigswith WB diet had lower BS than those with MP or IP diet(P<0.01)at 50kg,thebone strength was without significant difference among the three groups(P>0.05)at90kg.更多还原