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  • Author or Editor: Wiechert G. J. Middel x
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Abstract

Objective

To determine antibody titer against bovine respiratory syncytial virus (BRSV) in dairy calves on farms and to investigate whether passively acquired antibody titers differ in calves born in various seasons.

Sample Population

Serum samples from 129 colostrum-fed replacement calves in 8 dairy herds.

Procedure

A standard ELISA was used to determine BRSV-specific antibodies in serum samples obtained monthly, and antibody titers for calves born in various seasons were compared.

Results

BRSV-specific antibody titer in colostrum-fed dairy calves decreased to undetectable values at 3 to 4 months old. Calves born in winter generally had lower titers, compared with those for calves born in other seasons (P< 0.05). Titers in calves born in seasons other than winter did not differ.

Conclusions and Clinical Relevance

Calves born in winter generally have lower BRSV-specific antibody titers, which may be caused by generally lower antibody titers in colostrum or by factors influencing colostrum intake. (Am J Vet Res 1999;60:1098-1101)

Free access
in American Journal of Veterinary Research