论文标题:甘露寡糖、糖萜素及金霉素在肉仔鸡饲粮中添加效果的研究
EFFECTS OF DIETARY MANNOSE-OLIGOSACCHARIDES,SACCHARIC-TERPENIN AND CHLORTETRACYCLINE SUPPLEMENT ON BROILERS
论文作者 张忠远
论文导师 韩友文,论文学位 硕士,论文专业 动物营养与饲料科学
论文单位 东北农业大学,点击次数 110,论文页数 33页File Size1382k
2001-04-01论文网 http://www.lw23.com/lunwen_42089912/ 甘露寡糖,糖萜素,金霉素,肉仔鸡,添加剂
Mannose-oligoasecharides, Saccharic-terpenin,Chlortetracycline,Broiler,Feed Additive
甘露寡糖和糖萜素是当前比较热门的新型饲料添加剂。本研究通过饲养试验和微生物试验比较了甘露寡糖、糖萜素和金霉素对肉仔鸡生产性能及肠道菌群的影响，以期探讨甘露寡糖和糖萜素在肉仔鸡饲粮中替代金霉素的效果。 试验采用2×4二因子试验设计方案，即对一半试鸡进行三天（15-17日龄）金霉素治疗剂量（500mg/kg）前处理，另一半试鸡不进行处理；从18日龄开始分别饲喂4种饲粮：基础饲粮（对照组）、基础饲粮+甘露寡糖（甘露寡糖组，750mg/kg）、基础饲粮+糖萜素（糖萜素组，650mg/kg）、基础饲粮+金霉素预防量（金霉素组，50mg/kg），共8个处理组，每组3重复，每重复10只鸡。每周称重，统计耗料，并在18日龄和49日龄进行盲肠内容物厌氧菌群、好氧菌群数量及pH值测定。 结果表明： 经过金霉素前处理，盲肠菌群数量无论是厌氧菌还是好氧菌都显著降低（p＜0.05）。前处理组在不同阶段的增重和耗料指标上均比未处理组有显著提高（p＜0.05）。 4种饲粮在肉仔鸡增重方面，除糖萜素组显著优于对照组外（p＜0.05），其它各组间差异不显著（p＞0.05）；在耗料方面，对于15-35日龄肉仔鸡，糖萜素组极显著低于甘露寡糖组（p＜0.01）、而显著低于对照组和金霉素组（p＜0.05），在42日龄前，糖萜素组只显著低于甘露寡糖组（p＜0.05），到42日龄以后，各组间差异均不显著（p＞0.05）。耗料/增重，15-35日龄间，糖萜素组显著小于对照组（p＜0.05），15-42日龄阶段，糖萜素组极显著小于对照组（p＜0.01），在42日龄以后，糖萜素组极显著小于其它三组（p＜0.01），甘露寡糖组也显著小于对照组（p＜0.05），以上说明糖萜素有节省饲料、提高饲料转化率的作用。饲粮间对肠道菌群和pH值影响不显著（p＞0.05）。 是否施以金霉素前处理与不同饲粮的交互作用对不同阶段肉仔鸡各生产性能指标、肠道菌群及pH值的影响皆不显著（p＞0.05）。 单因素分析结果显示，前处理糖萜素组增重效果最好（p＜0.05），未处理糖萜素组耗料最少（p＜0.05），糖萜素组（前处理和未处理）饲料转化率最佳（p＜0.01）；甘露寡糖组（前处理和未处理）可显著提高厌氧菌数量和降低好氧菌数量（P＜0.05）；与未处理对照组相比，前处理金霉素组增重显著（p＜0.05），而未处理金霉素组则未见显著差异（p＞0.05）。 综上，在肉仔鸡饲粮中添加50mg/kg金霉素未表现出明显提高生产性能的效果，甘露寡糖则能够改善肠道菌群状况，而糖萜素虽对肠道菌群没有显著影响，但可以显著提高生产性能，获得较好的经济效益。
Mannose-oligosaccharides (MOS) and Saccharic-terpenin (ST) are novel feed additives up to date. Effects of MOS, ST and Chlortetracycline (CTC) on broiler performance and intestinal bacterial colonies were compared by feeding trial and microbiological trial in order to determine effectiveness of MOS and ST as substitute of CTC. According to 2 X 4 factorial design, 120 broilers were treated with CTC therapeutic dosage (500 mg/kg) and the same numbers of broilers were used as control. Four diets which included basal diet (control group), basal diet + MOS (MOS group, 750 mg/kg), basal diet + ST (ST group, 650 mg/kg) and basal diet + CTC (CTC group, 50 mg/kg) were fed from 18 days of age. The experiment included 8 treatments with three replicates of 10 broilers each. Weight and feed consumption were recorded every week. Caecum bifidobacterium and Escherichia coil concentration and pH value were determined at 18 and 49 days of age respectively. The results were as follows: Caecum bifidobacterium and Escherichia ccli concentration significantly decreased (p0.05) after 42 days of age. Feed conversion of ST group was lower significantly (pO.05).-2-Variance analysis of single faCtor showed that STotated grOuP ghned fastest and ST-untrcated group consumed bo leaS. ST grOup attained feed conversion rate best. MOS grouPincreased Caecum bifidobacterium concentration and decreased Escherchia coli concentrationsignifiCanly (p<0.05). Body gain of CTC-treated group was higher (P<.05) than that ofcontrol-untreated grouP, but there was no significan difference (P>0.05) betWeencontrol-uforated group and CTC-utheated group in Performance.In conclusion, adding 50 mm CTC to broiler dietS had no significan effect on..improving performance. MOS administraion of diets improved intestinal bacterium condition.Although ST had no significant effect on intestinal bacerium numbers, it may improvesignificantly performance and made better profit.Master Candidate: Zhang ZhongyuanMajor: Animal Nutrition and Feed ScienceSupcrvisor: Prof. Han YOuwen
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