Effect of somatic cell count level on functional longevity in Valle del Belice dairy sheep assessed using survival analysis.
J Dairy Sci
; 92(12): 6160-6, 2009 Dec.
Article
en En
| MEDLINE
| ID: mdl-19923619
ABSTRACT
The objectives of this study were to evaluate the effect of somatic cell count (SCC) on functional longevity and to estimate the heritability of functional longevity using survival analysis in Valle del Belice dairy sheep. A total of 4,880 lactations of 2,190 ewes from 11 flocks were used. In this study, SCC was considered as an indication of subclinical mastitis. In case of clinical cases, identified by the technicians at milking time, test-day weights and milk samples of those ewes were not considered. Somatic cells were analyzed as counts, without any transformation, and were grouped in 3 classes based on the observed SCC maximum (mxSCC). The mxSCC classes, expressed as 10(3) cells/mL, were classified as 1 if mxSCC
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Ovinos
/
Leche
/
Longevidad
/
Mastitis
Tipo de estudio:
Prognostic_studies
Límite:
Animals
País/Región como asunto:
America central
/
Belice
/
Caribe ingles
Idioma:
En
Revista:
J Dairy Sci
Año:
2009
Tipo del documento:
Article
País de afiliación:
Italia
Pais de publicación:
EEUU
/
ESTADOS UNIDOS
/
ESTADOS UNIDOS DA AMERICA
/
EUA
/
UNITED STATES
/
UNITED STATES OF AMERICA
/
US
/
USA