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The Effect of Flies and Fly Sprays on Certain Physiological Processes of the Dairy Cow

Divisions of Animal Husbandry and Entomology, University of California, Davis

ABSTRACT

Although nearly 30 years have elapsed since it was first demonstrated that the production of dairy cows is not lessened by their exposure to flies, and that the use of fly repellents cannot be justified on economic grounds (1, 2, 3) dairymen are still spending, in the aggregate, vast sums of money for commercial animal sprays. Judged by the increasing number of requests received by the College of Agriculture for information on the subject, the use of fly sprays in California, at least has increased rather than diminished in recent years.

This growing interest in the problem, the improved specialized research equipment available at this station (including a psychrometric room and a respiration chamber, both large enough to accommodate two mature cows) and the general scientific knowledge that has been developed since the original researches were conducted 30 years ago, all seemed to warrant a reinvestigation of flies and fly sprays in their relation to dairy cows.