The effect of bovine virus diarrhoea virus infection on conception rate
The possible influence of bovine virus diarrhoea virus (BVDV) on conception rate was studied in five dairy herds in which animals persistently infected with BVDV were found. In each herd a risk period was defined as the period (starting January 1986) before the oldest of the persistently infected animals was 6 months old. The post-risk period was defined as the period thereafter (ending December 1988).The prevalence of antibody carries was assumed to be low at the beginning of the risk period; seroprevalences were moderate to high in the post-risk period in each herd.In all herds, conception rate was higher (four of five individual-herd P 2 test was P
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