RESUMO
Background: The present study was designed to assess the comparative bio-equivalence of Micotil 300� and Cozina 300� in healthy broiler chickens after oral administration of both products in a dose of 15 mg tilmicosin base/kg body wt.Methods: Twenty four broiler chickens were divided equally into two groups (12 chickens for each group). The first group was designed to study the pharmacokinetics of Micotil 300�, while the 2nd group was designed to study the pharmacokinetics of Cozina 300�. Each broiler chicken in both groups was orally administered with 15 mg tilmicosin/kg body wt. Blood samples were obtained from the wing vein and collected immediately before and at 0.08, 0.16, 0.25, 0.5, 1, 2, 4, 6, 8, 12 and 24 hours after a single oral administration.Results: The disposition kinetics of Micotil 300� and Cozina 300� following oral administration of 15 mg tilmicosin/kg body wt revealed that the maximum blood concentration [Cmax] were 1.73 and 1.67 ?g/ml and attained at [tmax] of 2.01 and 2.04 hours, respectively.Conclusions: Cozina 300� is bioequivalent to Micotil 300� since the ratios of Cmax, AUC0-24 andAUC0-? (T/R) were 0.96, 0.93 and 0.91 respectively. These are within the bio-equivalence acceptance range. Micotil 300� and Cozina 300� are therefore bioequivalent and interchangeable.
RESUMO
Background: The present study was conducted to evaluate the efficacy of lincomycin and/or bacitracin for control of experimentally-induced Clostridium perfringens (CP) infection in broiler chickens.Methods: A total of 100 one-day-old Cobb-mixed chicks were divided into five groups (A, B, C, D and E, each of 20 bird). At the 15th day of age, all birds (except group A) were inoculated orally with CP broth culture (109 CFU/mL). Two days later, drugs were orally administered once daily for five consecutive days as follow; Group A and B were left untreated. Group C, D, and E were treated with lincomycin (0.5 g/l), bacitracin (100 mg/l), lincomycin and bacitracin, respectively. The efficacy of used drugs was estimated based on clinical symptoms, body weight, weight gain, feed conversion rate. Hematobiochemical changes were also determined.Results: Necrotic enteritis in broiler chickens induced a significant decrease in body weight, weight gain, erythrocytic count, hemoglobin content, PCV %, serum proteins, catalase, and superoxide dismutase. Additionally, a marked decrease in serum lipids was obtained. Furthermore, a significant increase in feed conversion rate, leukocytic count, phagocytic activity, phagocytic index, serum total globulin, ? globulin and malondialdehyde coupled with a marked increase in ? and ? globulins were determined. Medication of infected broilers with lincomycin and/or bacitracin improved clinical signs and reduced mortality rate to 8, 6 and 2%, respectively, as well as restored the performance and hematobiochemical alterations.Conclusions: a combination of lincomycin and bacitracin was of considerable value for the control of necrotic enteritis in broiler chickens.