Korean Journal of Poultry Science (한국가금학회지)

The Korean Society of Poultry Science (한국가금학회)
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Effects of Antibiotics(Avoparcin, Nosiheptide, Enramycin) as Supplementary Growth Promoters on the Performance of Broiler Chickens

성장촉진용 항생제(Avoparcin, Nosiheptide, Enramycin)가 육계의 생산성에 미치는 영향

  • Published : 1994.06.01
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Abstract

In order to study performance enhancing effects of supplementary antibiotics (avoparcin, nosiheptide and enramycin), two feeding trials were conducted. In Experiment 1, 1, 040 male Arbor Acres were reared in floor pens for 6 wk. Chicks were assigned to one of the following four treatments: Basal diet(B), B+avoparcin 10 ppm, B+nosiheptide 2.5 ppm and B+enramycin 5 ppm. Each treatment had five replications of 52 chicks each. In Experiment 2, two antibiotics (avoparcin and enramycin) were compared in $2{\times}2$ (antibiotics$\times$sex) factorial design. One thousand broiler chicks were reared in floor pens for 6 wk. Each of the 4 treatments had five replications of 50 chicks each. The results of Experiment 1 showed that antibiotic treatments (enramycin, avoparcin and nosiheptide) significantly(P <0.05) improved weight gain. Feed/gain ratio of avoparcin treatment and enramycin treatment tended to he lower than the control but they were not statistically significant. Dressing percentages were high in avoparcin and enramycin treatments compared to the control and nosiheptide treatment. The number of E. coli and Cl. perfringens in ileum and cecal contents were decreased by antibiotic treatments. Moisture contents in excreta of the birds were not significantly affected by the treatments. Leg abnormality and mortality were not significaniy different among treatments. In Experiment 2, weight gain was significantly (P<0.01) different between sexes, but not between antibiotic treatments. Significant effects of antibiotics (P<0.01), sex (P<0.01) and interaction (P<0.05) were shown in feed in take. Feed/gain ratio of avoparcin treatment was significantly (P<0.01) lower than that of enramycin treatment. leg abnormality and mortality were not significantly different among treatments but those in male broiler tended to be higher than in female broilers. It was concluded that nonsystemic antibiotics supplemented to the broiler diets suppress undesirable microorganisms and improve broiler performace in general and avoparcin was most effective in improving feed/gain ratio.

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