PSVI-32 Comparison on effect of antibiotic supplementation between fast-growing yellow-feathered broilers and Arbor Acres broilers

Abstract

Abstract The purpose of this experiment was to find out the regular pattern and difference of intestinal development between Arbor Acres broilers and yellow-feathered broilers in different periods. A total of 240 one-day-old yellow-feathered broilers and Arbor Acres broilers were randomly allotted into 4 groups for each group consisting of 6 replicates with 10 birds per replicate. The two control groups were fed corn-soybean-based diets, and the two antibiotic groups were fed the based diets with 50 mg/kg chlortetracycline. The experimental period lasted for 42d. The results showed as follows: 1) Compared with the control group, the addition of antibiotics significantly increased the FBW and ADG of broilers, but had no significant effect on F/G. And there were no interaction between breeds and antibiotics. 2) At 21 days, there were no significant difference in the ratio of villus height to crypt depth of jejunum and cecum among all groups. At 42 days, the ratio of villus height to crypt depth in jejunum of Arbor Acres broilers was significantly lower than that of yellow-feathered broilers, while that in cecum was significantly higher than that of yellow-feather broilers. The effects of antibiotics were not significant, and there were no interaction between breeds and antibiotics. 3) There were no significant difference in the antioxidant index of jejunum between the two breeds. Compared with the control group, the activities of catalase, glutathione peroxidase and superoxide dismutase in the antibiotic group were significantly increased, so does the total antioxidant capacity. And there were no interaction between breeds and antibiotics. However, the activity of catalase, malondialdehyde and protein carbonyl content in cecum had interaction between breeds and antibiotics. In conclusion, the intestinal development of different breeds of broilers was different, and the time and location of antibiotic action were also different. In actual production, antibiotics should be used scientifically and rationally.