Factors associated with the effectiveness of antibiotic treatment for ovine virulent footrot |
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| Authors: | D. JORDAN,JW PLANT&dagger ,HI NICOL&Dagger ,TM JESSEP,CJ SCRIVENER |
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| Affiliation: | *New South Wales Agriculture, PO Box 408, Queanbeyan, New South Wales 2620;†New South Wales Agriculture, Elizabeth Macarthur Agricultural Institute, PMB 8, Camden, New South Wales 2570;‡New South Wales Agriculture, Agricultural Research and Veterinary Centre, Forest Road, Orange, New South Wales 2800;§New South Wales Agriculture, PO Box 389, Goulburn, New South Wales 2580;¶University of Melbourne Veterinary Clinical Centre, Princes Highway, Werribee, Victoria 3030 |
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| Abstract: | Factors associated with the proportion of sheep cured of virulent footrot after antibiotic treatment were studied in a field trial under dry environmental conditions. From 2 similar flocks, 1091 Merino sheep weighing about 50 kg and infected with virulent footrot received an intramuscular injection of either 12 mL of a mixture of penicillin (250 mg/mL) and streptomycin (250 mg/mL), 6 mL of long acting oxytetracycline (200 mg/mL) or 6 mL of a mixture of lincomycin (50 mg/mL) and spectinomycin (100 mg/mL). Variables that were significantly associated with the proportion of sheep cured were: the type of antibiotic used, the number of feet infected and the flock from which the sheep came. There was an interaction between antibiotic type and number of feet infected and between antibiotic type and flock in association with the proportion of sheep cured. The extent of paring and the occurrence of blowfly strike in footrot lesions treated with diazinon had no significant association with the proportion of sheep cured. |
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