Effects Of Dietary Mannose-oligosaccharides,saccharic-terpenin And Chlortetracycline Supplement On Broilers

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...