Depletion time of antibiotic residues in milk from Manchega dairy ewes
2001
Althaus, R.L. | Molina, P. | Soutullo, H. | Peris, C. | Martínez, M. | Fernández, N. (Universidad Politécnica de Valencia (Spain). Dept. de Ciencia Animal)
The use of pharmacological products, which may contaminate milk and affect its quality, is a standard practice to treat various sheep diseases. The aim of the study was to analyse the depletion time of an antibiotic solution injected in ewes to treat mastitis. Twelve Manchega ewes at the end of the lactation period (5th month) were injected with a colistine, spiramycin and dexametasone solution (Mames parenteralp). Milk samples from a single daily milking (morning) were collected after 24 hours from the antibiotic treatment and for the following 14 days and analysed by the microbiological methods BRTp and Delvotestp. Our preliminary results indicated that depletion time of colistine and spiramycin in milk collected from treated ewes, determined by BRTp and Delvotestp methods, was 10 days, and it depended on the daily milk production of the ewes
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