摘要
This study was conducted to determine the pre-caecal and faecal digestibility of lactulose and inulin and the influence of these substances on nutrient digestibility and microbial characteristics. In metabolic trials three of six male growing pigs (German Landrace × Pietrain) were fitted with an ileo-rectal anastomosis (IRA) in end-to-end technique with preserved ileo-caeco-colic valve. The metabolic trials were conducted from day 21 – 63 after surgery. The remaining pigs were used as intact partners (IN) for the IRA pigs. The experimental diets, based on corn, wheat, barley and soybean meal, were supplemented with either 1.5% lactulose or 2% inulin in replacement of diatomaceous earth (control). Pre-caecal digestibility of lactulose and inulin was assessed to be 79 and 98%, respectively, faecal digestibility was determined as 100%. The supplementation of lactulose and inulin had only minor effects on the pre-caecal and faecal digestibility of nutrients. Significant differences in nutrient digestibility were obvious between IRA and IN pigs, whereas the IRA pigs showed lower digestibility values with the exception of ether extracts (EE). Bacterial population in the digesta of IRA and IN pigs were not affected by the experimental diets except the concentration of gram-negative anaerobes, which inclined when the IRA pigs received the lactulose diet. The pH of chyme was significantly lower than the pH of faeces, however the pH was unaffected by the different supplemented diets. The concentration of volatile fatty acids (VFA) in pre-caecal chyme decreased significantly when IRA pigs received the lactulose supplemented diet whereas VFA in faeces were unaffected by the supplementation. IRA pigs administered with lactulose excreted more N via the urine, but the nitrogen balance remained unaffected. From the present investigation it can be concluded that lactulose and inulin did only partly or scarcely fulfill the expectation of acting as prebiotics in pigs.
摘要译文
这项研究是为了确定乳果糖和菊粉和这些物质对养分消化率和微生物特性影响的预盲肠和粪便消化率。在代谢试验三只雄性生长猪（长白德国皮特兰）分别装有一个回肠直肠吻合术（IRA）在端 - 端技术与保存回肠caeco绞痛阀。代谢试验是从21日进行手术后63。剩余的猪用作完整伙伴（IN）的IRA猪。实验膳食的基础上，玉米，小麦，大麦和大豆粉，被补充有1。5％乳果糖或替代硅藻土（对照）的2％的菊粉。乳果糖和菊粉的预盲肠消化率被评估为79和98％，分别粪便消化率被确定为100％。乳果糖和菊粉的补充只有在营养物质的预盲肠和粪便消化率的影响较小。养分消化率显著的差异是显而易见的IRA之间和猪，而猪共和军显示出较低的消化率除乙醚提取物（EE）的。细菌群体以IRA的食糜和IN猪不受实验饮食除革兰氏阴性厌氧菌的浓度，它倾向于当爱尔兰共和军收到猪乳果糖饮食。食糜的pH比粪便的pH显著降低，但pH为不受不同补充饮食。挥发性脂肪酸（VFA）的预盲肠食糜中心定位显著下降时的IRA猪接收的乳果糖补充饮食而VFA在粪便是不受补充。给予乳果糖IRA猪通过尿液排出体外更多的N，但氮平衡不受影响。从本研究可以得出结论，乳果糖和菊粉也仅部分地或几乎不履行作为猪益生元的期望。
Gertraud R Branner[a]; Barbara M Böhmer[a]; W Erhardt[b]; Julia Henke[b] ; Dora A Roth-Maier Prof. Dr[a][*]. Investigation on the precaecal and faecal digestibility of lactulose and inulin and their influence on nutrient digestibility and microbial characteristics[J]. Archives of Animal Nutrition, 2004,58(5): 353-366