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Comparou-se a eficiência dos tratamentos tópico e sistêmico com oxitetraciclina em vacas com dermatite digital papilomatosa (DDP) e determinaram-se a presença de resíduos desse antimicrobiano no leite e sua concentração no líquido sinovial e no plasma. Utilizaram-se o tratamento tópico com oxitetraciclina em pó (grupo 1) e o sistêmico de longa ação (grupo 2) em 16 vacas holandesas em lactação, acometidas por DDP. Obtiveram-se amostras de plasma, líquido sinovial e leite nos momentos: M0, antes dos tratamentos; M1, seis horas após o tratamento e em intervalos de 12 horas até M23 (264 horas pós-tratamentos). Avaliaram-se o grau de claudicação, a extensão da lesão e a concentração da oxitetraciclina pela cromatografia líquida de alta eficiência. Nas vacas do grupo 1, ocorreu redução das lesões e da claudicação, quando comparadas com as do grupo 2. Nenhuma das amostras de leite, de líquido sinovial e de plasma nos animais do grupo 1 foi positiva para oxitetraciclina. As amostras de leite dos animais do grupo 2, entre M1 e M23, apresentaram valores acima do limite máximo residual permitido para esse antimicrobiano. O tratamento tópico foi eficiente no tratamento de DDP, sem produzir resíduos no leite ou concentrações no plasma e no líquido sinovial. O tratamento sistêmico foi ineficiente para DDP, resultando em resíduos no leite, durante a avaliação.The efficacy of topical versus systemic treatment with oxytetracycline for papillomatous digital dermatitis (PDD) in dairy cows was compared. Antimicrobial residues in milk and their concentrations in synovial fluid and plasma were analysed. Sixteen lactating Holstein cows with PDD lesions were topically treated with oxytetracycline powder (group 1) or long-acting oxytetracycline (group 2). Plasma, synovial fluid, and milk samples were collected in the following moments: M0 (before treatments); at six hours after treatments (M1), and at 12-hour intervals until 264 hours after treatments (M23). Lameness score and lesion size were evaluated. Analysis of oxytetracycline concentration was performed by high-performance liquid chromatography (HPLC). Cows in group 1 showed reduced lesion size and lameness score when compared to cows in group 2. None of the plasma, synovial fluid, or milk samples collected from cows in group 1 were positive to oxytetracycline. However, violative antimicrobial residues were detected in milk samples collected from cows in group 2, from M1 until M23. Topical application of oxytetracycline powder was an efficient treatment for PDD with no risk of violative antimicrobial residues in milk or increases its concentration in plasma or synovial fluid. The systemic administration of oxytetracycline was inefficient to treat PDD and caused violative residues in milk

Comparação entre as administrações tópica e sistêmica de oxitetraciclina no tratamento de vacas com dermatite digital papilomatosa