| Summary: | Colistin is a decapeptide antibiotic with narrow spectrum activity, mainly used as treatment for Gram negative bacteria. This study aims to scientifically determine the effect of colistin administration as medicated feed on alanine aminotransferase (ALT) and creatinine level in broiler infected with Escherichia coli. KTOP group as positive control, KTON group as negative control, while I, II, and III groups were infected with Escherichia coli 1 x 108 CFU/ml 0.1 ml via intratracheal route. Group I, II, and III were given colistin treatment dosage of 0.3 g/kg food, 0.6 g/kg food, and 1.2 g/kg food. Blood samples were taken through brachial veins for ALT and creatinine examination with a Caretium NB-201 semi-auto chemistry analyzer. Data were examined statistically using IBM SPSS Statistics 24 software and graphically using Microsoft Excel 365. Conclusion of the research by statistical analysis with Kruskal-Wallis test obtained ALT test results P = 0.147 and creatinine test results P = 0.815. Based on the results of this study, the administration of colistin medicated feed did not cause a significant effect on ALT and creatinine level in broiler infected with Escherichia coli, indicating that colistin has low potential toxicity while given as medicated feed.
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