两个实验(实验。)进行回肠插管生长的手推车。确定了回肠消化和粪便中位置肌醇磷酸(InsP)异构体的浓度,以及前肠和全道植酸(InsP6)水解,和干物质的消化率,P,Ca,氮,和总能量。还研究了回肠消化物中的前粪便氨基酸(AA)消化率和消化酶活性。在两个Exp中。,猪的初始体重(BW)为28公斤,并完全随机分配到有八头猪的双拉丁方设计中,四种饮食,三个周期,每个周期12d。收集粪便和回肠消化物5d和2d,分别。将猪单独饲养在不锈钢代谢单元中。可随意获得水,并且每天以平均BW的4%的量提供两次饲料。在Exp中。在图1中,猪接受补充有0、750、1,500或3,000FTU的微生物植酸酶/kg饮食的基于玉米-大豆粉(SBM)的饮食。在Exp中。2,根据玉米和SBM或SBM-油菜籽饼(RSC)混合物和植酸酶补充剂,以0或1,500FTU/kg的饮食为基础,将猪分配给2×2的饮食。在没有植酸酶补充剂的猪的回肠消化中,InsP6旁边的主要InsP异构体是InsP5异构体。回肠消化液中的InsP模式随两个Exp中微生物植酸酶的包含而变化。,Ins(1,2,5,6)P4浓度显著增加(P<0.001)。在两个Exp中。,添加植酸酶后,回肠消化液中的肌醇浓度更高(P<0.001)。没有植酸酶的补充,前肠和全道磷消化率较低,而几乎没有InsP6在粪便中排泄。前束和全束P消化率值之间没有差异。对于Exp中研究的大多数AA。如图2所示,当饮食含有RSC时,前粪便消化率较低(P<0.01)。然而,在两个实验中,植酸酶的补充均未显着影响前AA的消化率。本研究表明,当补充微生物植酸酶时,基于SBM和SBM-RSC的饮食中回肠末端的InsP6消失可以增加到约90%,但前磷消化率几乎不超过60%。该研究证实,猪不能受益于后肠中显著的InsP6降解。
Two experiments (Exp.) with ileally cannulated growing barrows were conducted. The concentrations of positional inositol phosphate (InsP) isomers in ileal digesta and feces were determined, as well as the prececal and total tract phytate (InsP6) hydrolysis, and digestibility of dry matter, P, Ca, nitrogen, and gross energy. Prececal amino acid (AA) digestibility and digestive enzyme activities in ileal digesta were also studied. In both Exp., pigs had an initial body weight (BW) of 28 kg and were completely randomized to a Double Latin Square Design with eight pigs, four diets, and three periods of 12 d each. Feces and ileal digesta were collected for 5 d and 2 d, respectively. Pigs were housed individually in stainless steel metabolic units. Water was available ad libitum and feed was provided two times daily at an amount of 4% of mean BW. In Exp. 1, pigs received a corn-soybean meal (SBM)-based diet that was supplemented with 0, 750, 1,500, or 3,000 FTU of a microbial phytase/kg diet. In Exp. 2, pigs were allotted to a 2 × 2 arrangement of diets based on corn and SBM or an SBM-rapeseed cake (RSC) mix and phytase supplementation at 0 or 1,500 FTU/kg of diet. In ileal digesta of pigs fed without the phytase supplement, the dominating InsP isomers beside InsP6 were InsP5 isomers. The InsP pattern in ileal digesta changed with the inclusion of microbial phytase in both Exp., as there was a remarkable increase in Ins(1,2,5,6)P4 concentration (P < 0.001). In both Exp., the myo-inositol concentration in ileal digesta was greater upon phytase addition (P < 0.001). Without phytase supplementation, prececal and total tract P digestibility were low, whereas hardly any InsP6 was excreted in feces. There was no difference between prececal and total tract P digestibility values. For most AA studied in Exp. 2, prececal digestibility was lower (P < 0.01) when the diet contained RSC. However, phytase supplementation did not significantly affect prececal AA digestibility in both Exp. The present study showed that InsP6 disappearance by the end of the ileum can be increased up to around 90% in SBM- and SBM-RSC-based diets when microbial phytase is supplemented, but prececal P digestibility hardly exceeded 60%. The study confirms that pigs cannot benefit from a remarkable InsP6 degradation in the hindgut.