Fly Sprays for Dairy Cows-A Progress Report

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Abstract:

Fly sprays of petroleum oils carrying py1'ethrum, pine oil, or both, designed to keep flies from dairy cows were tested for their efficiency. It was shown that all had approximately the same efficiency for the first hour but differed at subsequent intervals, pine oil increasing their efficiency in proportion to the amount applied.

Burning followed the use of oils having a viscosity lower than 40 seconds irrespective of the unsulfonated residue while oils with unsulfonated residues below 90 per cent were dangerous if used in oils of higher than 65 seconds viscosity.

The pyrexial point, defined as the environmental temperature above which cows could not maintain a normal body temperature, was determined for the experimental animals. The application of oil sprays lowered this pyrexial point approximately five degrees by impairing the small amount of cooling that takes place, through the action at the surface of the skin. The different sprays varied in their effects on this pyrexial point.

Document Type: Research Article

Publication date: April 1, 1932

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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