Milk production increases following treatment of subclinical parasitisms in Wisconsin dairy cattle

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Abstract
Extract Over the past 20 years a series of surveys based on worm egg counts has been conducted on the prevalence of worm parasitisms in Wisconsin dairy cattle. In full acceptance of the many uses, limitations and interpretations of egg counts, these nevertheless have led us to conclude that, when eggs are found, live worms are present within the cattle, that is, that active and important parasitisms are present. Our first state-wide surveys of Wisconsin dairy herds, conducted in the early 1950s, established universal prevalence of active worm parasitisms in the herds, and the latest stated-wide surveys in the 1970s established the same continuous prevalence (Cox and Todd, 1962 Cox, D. D. and Todd, A. C. 1962. Survey of gastrointestinal parasitism in Wisconsin dairy cattle. Am. vet. med. Ass., 141: 706–709. [Google Scholar] ; Meyers, 1970 Todd, A. C , Bliss, D. H. , Myers, G. H. and Cox, D. D. 1972. Milk production in Wisconsin dairy cattle after anthelmintic treatment. VM/SAC, 67: 1233–1236. [Google Scholar] ; Todd et al., 1972 Todd, A. C , Bliss, D. H. , Myers, G. H. and Cox, D. D. 1972. Milk production in Wisconsin dairy cattle after anthelmintic treatment. VM/SAC, 67: 1233–1236. [Google Scholar] ; Bliss, 1973 Bliss, D. H. 1973. “The Prevalence of Parasitisms in Wisconsin and their Impact on Milk Production in Dairy Cows”. In M.S. thesis, University of Wisconsin. 99 pp. [Google Scholar] ; Bliss and Todd, 1973 Bliss, D. H. and Todd, A. C. 1973. Milk production by Wisconsin dairy cattle after deworming with BaymixR. VM/SAC, 68: 1034–1038. [Google Scholar] ). In the past 20 years the parasitisms have not been controlled, have scarcely ever been treated until recent years, and have not declined.