The Face Fly (Diptera: Muscidae): Effect on Holstein Milk Secretion

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Three switchback-design field trials were conducted in which we compared milk quantity and quality between herds of Holstein cows, one protected from face flies, Musca autumnalis De Geer, and the other exposed to face flies. Cows were between the peak and the middle of lactation, fed and milked similarly, and grazed on adjacent pastures while alternately protected from or exposed to face flies during three 10-day penods. Data concerning face fly numbers, and milk weights and silage consumption were taken for each cow daily; milk samples for chemical analysis were taken each second or third day. With one exception, the results for each trial showed that average milk wight values did not differ between exposed and protected cows, despite marked differences III face fly numbers. Further, no consistent differences were observed in percentage of milk fat, percentage of protein, percentage of nonfat solids, or somatic cell counts. Silage consumption and silage conversion efficiency were also similar for protected and exposed herds. We therefore conclude that exposure to greater numbers of face flies resulted in little, If any, effect on milk secretion.

Document Type: Research Article

Publication date: October 1, 1984

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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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