Bulk milk somatic cell counts and bovine viral diarrhoea virus (BVDV) infection in 7252 dairy herds in Brittany (western France).
Prev Vet Med
; 72(1-2): 163-7; discussion 215-9, 2005 Nov 15.
Article
em En
| MEDLINE
| ID: mdl-16169615
ABSTRACT
Variations in test-day bulk milk somatic cell count (BMSCC) according to bovine viral diarrhoea virus (BVDV) infection status of the herd were quantified. Infection statuses were defined, based on bulk-milk antibodies measured twice 4 months apart. On each test-day, BMSCC was calculated as the weighted mean of the individual cow-level somatic cell counts. A total of 97,985 test-days in 7252 herds were considered. The effect of the BVDV-infection on BMSCC was assessed using mixed linear models, controlling for herd (random), proportion of primiparous cows and average days in milk on test-day. Considering test-days contemporary to the BVDV-status definition-period, the increase in BMSCC was 12,000 (P<0.001), 27,000 (P<0.001) and 6000 (P=0.97) cells/ml in past-infected recently recovered, past-but-still-infected and recently infected herds respectively, compared with not recently infected herds. A carry-over effect (at least 1 year) of BVDV-infection on BMSCC was also evidenced in past-infected recently recovered, past-but-still-infected and recently infected herds.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Doença das Mucosas por Vírus da Diarreia Viral Bovina
/
Indústria de Laticínios
/
Leite
Tipo de estudo:
Screening_studies
Limite:
Animals
País/Região como assunto:
Europa
Idioma:
En
Revista:
Prev Vet Med
Ano de publicação:
2005
Tipo de documento:
Article
País de afiliação:
França