Relationship between mastitis pathogen numbers in bulk tank milk and bovine udder infections in California dairy herds.
J Am Vet Med Assoc
; 189(4): 442-5, 1986 Aug 15.
Article
en En
| MEDLINE
| ID: mdl-3531123
ABSTRACT
Samples of bulk tank milk and cow-composite milk from 23,138 dairy cows from 50 California dairies were examined by use of microbiologic procedures. The number of colonies of mastitis pathogens isolated per milliliter of bulk tank milk (used as a predictor of the percentage of infected cows in the herd) was evaluated, using simple regression analysis and Spearman's rank correlation. Correlations between the pathogens and the percentage of cows in each herd shedding the pathogens were found for Streptococcus agalactiae (r = 0.71) and mycoplasma (r = 0.59), but were considerably lower for other pathogens. When greater than or equal to 4,000 colonies of Streptococcus agalactiae were found per milliliter of bulk tank milk, at least 7% of the cows in the herd was shedding this organism. However, a pattern was not found between the number of mycoplasma colonies per milliliter of bulk tank milk and the percentage of infected cows in the herd.
Buscar en Google
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Infecciones Estafilocócicas
/
Infecciones Estreptocócicas
/
Leche
/
Infecciones por Enterobacteriaceae
/
Mastitis Bovina
/
Infecciones por Mycoplasma
Tipo de estudio:
Diagnostic_studies
/
Prognostic_studies
Límite:
Animals
País/Región como asunto:
America do norte
Idioma:
En
Revista:
J Am Vet Med Assoc
Año:
1986
Tipo del documento:
Article