Fthenakis, G. C.
Author Affiliation :
Greek Army Centre for Biological Research, STG 902B, Athens, Greece.
Small Ruminant Research
In a field investigation of ovine mastitis in 8 flocks in Southern Greece, a population of 760 dairy ewes was monitored during lactation. The prevalence of subclinical mastitis was 4.5% on the 1st sampling (at weaning of lambs), 11.2% on the 2nd sampling (2 to 3 weeks later) and 16.9% on the 3rd sampling (6 to 8 weeks after the second sampling). Although the prevalence of subclinical mastitis increased as the lactation period advanced, the risk rate of the disease decreased. Coagulase-negative staphylococci (Staphylococcus epidermidis, S. simulans, S. chromogenes, S. xylosus) were the main causal agents of the disease, but S. aureus, streptococci, Bacillus spp., Escherichia coli, Pasteurella haemolytica and Actinomyces pyogenes were also isolated from cases of subclinical mastitis. Of the 1084 milk samples collected, somatic cell counts more than 1.0 × 106 cells/ml were found in 97 (8.9%); 64 were bacteriologically positive, but 33 bacteriologically negative.
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Indexing terms for this abstract:
Organism descriptor(s) :
Escherichia coli, Pasteurella, sheep, Staphylococcus, Streptococcus
aetiology, bacterial diseases, ewes, incidence, mammary gland diseases, mastitis, microorganisms, sheep diseases, subclinical mastitis
Bacillus, bacterial infections, bacterioses, bacterium, causal agents, E. coli, etiology, micro-organisms
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Broader term(s) :
Escherichia, Enterobacteriaceae, Enterobacteriales, Gammaproteobacteria, Proteobacteria, Bacteria, prokaryotes, Pasteurellaceae, Pasteurellales, Ovis, Bovidae, ruminants, Artiodactyla, mammals, vertebrates, Chordata, animals, eukaryotes, Staphylococcaceae, Bacillales, Bacilli, Firmicutes, Streptococcaceae, Lactobacillales, Balkans, Southern Europe, Europe, Developed Countries, European Union Countries, Mediterranean Region, OECD Countries