A field investigation of subclinical mastitis in sheep in southern England
| Autor: | J.E.T. Jones, Angeliki Rothi Burriel, G.H. Watkins |
|---|---|
| Rok vydání: | 1991 |
| Předmět: |
Veterinary medicine
medicine.medical_specialty Sheep General Veterinary business.industry Prevalence Sheep Diseases Mastitis medicine.disease medicine.disease_cause medicine.anatomical_structure Milk England Staphylococcus aureus Lactation Epidemiology Etiology Medicine Animals Female Flock Subclinical mastitis business |
| Zdroj: | The British veterinary journal. 147(5) |
| ISSN: | 0007-1935 |
| Popis: | The prevalence, aetiology and epidemiological features of subclinical mastitis were investigated in 358 lowland ewes in seven flocks in southern England. Milk samples (2092) were collected at 3-weekly intervals; those which were both bacteriologically and Whiteside test positive were deemed to have originated from glands with subclinical mastitis. The period prevalence of subclinical mastitis was 11.7% and the prevalence remained relatively constant over the course of lactation (5.5-7.0%). The predominant bacterial isolates from 48 glands with subclinical mastitis were streptococci (42%), coagulase-negative staphylococci (33%), Pasteurella haemolytica (17%) and Staphylococcus aureus (8%). Coagulase-negative staphylococci were the predominant isolates (53%) from samples which did not show a positive Whiteside test result. The prevalence of subclinical mastitis increased with age of ewe but was not influenced by the presence of teat lesions. There was a significant association between the development of clinical mastitis (26 glands) and antecedent subclinical mastitis caused by the same organism (10 glands). |
| Databáze: | OpenAIRE |
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