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Department of Medicine
Department of Veterinary Microbiology and Immunology
Department of Community Health, University of California, Davis 95616
Upjohn Co., Kalamazoo, Ml 49001
ABSTRACT
Many dairy cattle are housed under drylot conditions, which generally are not considered conducive to elevated populations of gastrointestinal parasites. Thus, an examination of the potential benefits to be obtained by anthelmintic treatment of lactating cows under these circumstances was initiated. Because there were no statistically significant differences in milk production between control and treated groups, routine deworming cannot be considered economically sound under the management conditions described.
1 Conducted as a contributing project to Western Regional Project W—102.
2 Agricultural Decisions, Dixon, CA 95620.
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