Incidence risk and aetiology of mammary abnormalities in dry ewes in 10 flocks in Southern Greece |
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Authors: | P. Saratsis L. Leontides A. Tzora C. Alexopoulos G. C. Fthenakis |
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Affiliation: | a University of Thessaloniki, Veterinary Faculty 54006 Thessaloniki, Macedonia Greece b University of Thessaly, Veterinary Faculty, P.O. Box 199 43100 Karditsa Greece c TEI Epirus, Department of Animal Production, P.O. Box 110 47100 Arta Greece |
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Abstract: | In a field investigation of 10 flocks in Southern Greece, 3367 dairy ewes were examined twice, in order to estimate the incidence risk and the aetiology of mammary abnormalities during the dry-period. Abnormal secretion, lumps, nodules, diffuse hardness, abscesses and cysts were the abnormalities detected. The cumulative incidence of mammary abnormalities during the dry-period was 5.1% (95% confidence interval: 4.4–5.8%); 47% of the cases detected developed during the first three weeks after cessation of lactation. Despite variation in the flock size, there was no between-flock variation in the risk of a ewe developing mammary abnormalities. Staphylococci (Staphylococcus aureus and coagulase-negative isolates) were the most frequently isolated bacteria from mammary samples; Actinomyces pyogenes, Clostridium perfringens, streptococci and Escherichia coli were also isolated. Resistance was encountered among the staphylococcal isolates. |
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Keywords: | Mastitis Sheep-microbiological diseases Dry-period |
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