RT Journal Article T1 Comparison of pharmacokinetics of marbofloxacin after subcutaneous administration of various multiple-dose regimens to water buffalo calves (Bubalus bubalis) A1 Baroni, Eduardo E. A1 Rubio Langre, Sonia A1 Lucas Burneo, José Julio De A1 San Andrés Larrea, María Dolores De A1 San Andrés Larrea, Manuel Ignacio AB Objective—To determine pharmacokinetics of marbofloxacin in water buffalo calves (Bubalus bubalis) after multiple SC administrations and to assess differences in regimen efficacy.Animals—18 healthy buffalo calves.Procedures—Calves (n = 6 calves/group) were assigned to receive marbofloxacin SC in the neck at 1 of 3 dosages (2 mg/kg, q 24 h for 6 days [regimen 1]; 4 mg/kg, q 48 h for 6 days [regimen 2]; and 4 mg/kg, q 24 h for 3 days [regimen 3]). Serum marbofloxacin concentrations were analyzed. Efficacy predictors were estimated on the basis of minimum inhibitory concentration and mutant prevention concentration reported for Pasteurella multocida and Mannheimia haemolytica.Results—Mean ± SD area under the concentration-time curve was 5.92 ± 0.40 μg•h/mL for regimen 1, which differed significantly from that for regimens 2 (14.26 ± 0.92 μg•h/mL) and 3 (14.17 ± 0.51 μg•h/mL). Mean residence time and mean elimination half-life for regimen 2 (9.93 ± 0.20 hours and 8.77 ± 0.71 hours) both differed significantly from those for regimens 1 (721 ± 0.11 hours and 5.71 ± 0.38 hours) and 3 (759 ± 0.13 hours and 737 ± 1.19 hours). Values obtained from indices for P multocida and M haemolytica had an excessively wide range because of the various degrees of antimicrobial susceptibility (low, medium, and high) of the strains.Conclusions and Clinical Relevance—Regimen 3 had the most favorable indices, and it would be conducive for owner compliance and require less handling of animals. PB American Veterinary Medical Association SN 0002-9645 YR 2014 FD 2014 LK https://hdl.handle.net/20.500.14352/112522 UL https://hdl.handle.net/20.500.14352/112522 LA eng NO Baroni, E. E., Rubio, S., De Lucas, J. J., Andrés, M. D., & Andrés, M. I. (2014). Comparison of pharmacokinetics of marbofloxacin after subcutaneous administration of various multiple-dose regimens to water buffalo calves (Bubalus bubalis). American journal of veterinary research, 75(12), 1049–1055. https://doi.org/10.2460/ajvr.75.12.1049 NO Agencia Española de Cooperación Internacional y Desarrollo DS Docta Complutense RD 30 dic 2025