Economic impact and control of parasitism in dairy cattle

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Abstract
After consideration of the species and groups of parasites (gastrointestinal nematodes, Dictyocaulus viviparus, Fasciola hepatica, coccidia) affecting dairy cattle, a detailed critical review is given of work on subclinical parasitism in lactating cows, in particular the effect on milk production and the economic benefits that can accrue from anthelmintic treatment. Special reference is made to work done in the USA. Finally, brief comments are made on diagnosis and control.

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