果寡糖对肉鸡生长、肠道菌群和肠形态的影响

研究了饲粮中分别添加0、2000、4000、6000mg/kg果寡糖对艾维菌商品代肉鸡生长性能、肠道菌群和肠形态的影响。结果表明：目粮中添加4000mg/kg果寡糖使肉鸡日增重提高了9．53％（P＜0．01），2000、4000mg/kg果寡糖使料重比分别降低了5．09％（P＜0．05）和7．87％（P＜0．05）；4000mg/kg果寡糖使盲肠中双歧杆菌和总厌氧菌数分别增加了257．65％（P＜0．05）和100．00％（P＜0．05），使梭菌数下降了79．36％（P＜0．05）；2000、4000mg/kg果寡糖使盲肠中乳酸杆菌数分别增加了45．73％（P＜0．05）和67．97％（P＜0．01），使大肠杆菌数分别下降了75．71％（P＜0．05）和71．35％（P＜0．05）；4000和6000mg/kg果寡糖使盲肠中乙酸、丁酸和总短链脂肪酸含量分别提高了23．25％（P＜0．05）和26．08％（P＜0．05）、144．36％（P＜0．05）和202．97％（P＜0．01）、47．08％（P＜0．01）和58．31％（P＜0．01）；2000、4000和6000mg/kg果寡糖使盲肠中丙酸含量分别提高了45．27％（P＜0．05）、73．22％（P＜0．01）和89．37（P＜0．01）；4000、6000mg/kg果寡糖使盲肠上皮黏膜腺窝深度和细胞密度分别提高了22．62％（P＜0．05）和25．72％（P＜0．01）、19．28％（P＜0．05）和23．07％（P＜0．05）。

Effects of Fructooligosaccharide on Growth Performance and Intestinal Mi-croflora and Morphology of Broiler Chicks

Four hundred and eighty avian broiler chicks were allotted to four groups by weight to study the effects of fructooligosaccharide(FOS) on growth performance, intestinal microflora and morphology. Every group included three replicate lots of forty birds each. The groups received the same basal diet supplemented with 0, 2 000, 4 000, 6 000 mg/kg FOS respectively during the period of 1 to 49 days posthatching. Compared with the control group, the results were as follows:(1) 4 000 mg/kg FOS increased ADG by 9.53%(P<0.01) while 2 000 and 4 000 mg/kg FOS decreased F/G by 5.09%(P<0.05) and 7.87%(P<0.05). (2) 4 000 mg/kg FOS increased the viable counts of cecal Bifidobacteria and total anaerobes by 257.65%(P<0.05) and 100.00%(P<0.05), respectively and lowered the viable counts of Clostridia by 79.36%(P<0.05). 2 000 and 4 000 mg/kg FOS increased the viable counts of Lactobacilli by 45.73%(P<0.05) and 67.97%(P<0.01),and reduced the viable counts of Colibacillus by 75.71%(P<0.05) and 71.35%(P<0.05), respectively. (3) Supplementation with 4 000 and 6 000 mg/kg FOS significantly increased the concentrations of cecal acetate, butyrate, and the total short-chain fatty acids by 23.25%(P<0.05) and 26.08%(P<0.05), 144.36%(P<0.05) and 202.97%(P<0.01), 47.08%(P<0.01) and 58.31%(P<0.01), respectively. Supplementation with 2 000, 4 000 and 6 000 mg/kg FOS significantly increased the concentration of colonic propionate by 45.27%(P<0.05), 73.22%(P<0.01) and 89.37(P<0.01), respectively. (4) 4 000 and 6 000 mg/kg FOS increased the cecal muscosal crypt depth and the cecal muscosal cell density by 22.62%(P<0.05) and 25.72%(P<0.01), 19.28%(P<0.05) and 23.07%(P<0.05), respectively.