Effect of Mycobacterium paratuberculosis infection on production, reproduction, and health traits in US Holsteins.
Prev Vet Med
; 80(2-3): 103-19, 2007 Jul 16.
Article
en En
| MEDLINE
| ID: mdl-17350703
ABSTRACT
Our objective was to estimate the effect of Mycobacterium paratuberculosis infection on milk, fat, and protein yield deviations, pregnancy rate, lactation somatic cell score, and projected total months in milk (productive life). A serum ELISA and fecal culture for M. paratuberculosis were performed on 4375 Holsteins in 232 DHIA herds throughout the US. Primarily first through third lactation cows (99% of total) were assayed for infection. Trait information (except productive life) was obtained for the lactation concurrent with disease tests. Productive life was total months in milk through a cow's life, which was projected if a cow was still milking. For most analyses, case definition for M. paratuberculosis infection was defined as either an ELISA S/P ratio>or=0.25 or a positive fecal culture for M. paratuberculosis or both. To determine if diagnostic test affected estimates, case definition was redefined to include only cows with ELISA S/P ratios>or=0.25 or only fecal culture-positive cows. Linear models were used to estimate effect of M. paratuberculosis infection on traits. M. paratuberculosis-infected cows (7.89% of cows) produced 303.9 kg less milk/lactation, 11.46 kg less fat/lactation, and 9.49 kg less protein/lactation (P
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Banco de datos:
MEDLINE
Asunto principal:
Paratuberculosis
/
Lactancia
/
Enfermedades de los Bovinos
/
Índice de Embarazo
/
Leche
Tipo de estudio:
Prognostic_studies
Límite:
Animals
/
Pregnancy
Idioma:
En
Revista:
Prev Vet Med
Año:
2007
Tipo del documento:
Article
País de afiliación:
Estados Unidos