Summary
The effect of bovine virus diarrhoea virus (BVDV)-infection on pregnancy rate, on stillbirths and mortality of neonatal calves and the size of newborn calves was evaluated in 8 herds in which persistently infected (Pl)-animals had been identified. Data from 9 herds without Pl-animals were used as controls.
At the time of conception of the oldest Pl-animal a significant drop in pregnancy rate to about half the herd average was found. About 6 months later a 3-fold rise in calf mortality was seen. This pattern was found in 4 of the herds. In the remaining 4 herds the pattern was less clear, probably reflecting different immune states of the herds.
Rough estimation of the size of newborn calves showed that Pl-animals were significantly smaller than normal animals.
Monitoring of herds for the above-mentioned parameters may be a means of pointing out herds with Pl-animals. Most of the data necessary for such surveillance schemes are already available and may readily be used.
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© 1991 Springer-Verlag
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Houe, H., Meyling, A. (1991). Surveillance of cattle herds for bovine virus diarrhoea virus (BVDV)-infection using data on reproduction and calf mortality. In: Liess, B., Moennig, V., Pohlenz, J., Trautwein, G. (eds) Ruminant Pestivirus Infections. Archives of Virology, vol 3. Springer, Vienna. https://doi.org/10.1007/978-3-7091-9153-8_18
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DOI: https://doi.org/10.1007/978-3-7091-9153-8_18
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