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Journal of Dairy Science Vol. 45 No. 4 543-544
© 1962 by American Dairy Science Association ®
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Estimates of Heritability of Fly Susceptibility in Dairy Cattle1

G. A. Mount, D. E. Howell, E. R. Berousek2 and R. D. Morrison

Departments of Entomology, Dairying, and Statistics Laboratory, Oklahoma State University, Stillwater, Oklahoma

ABSTRACT

The use of chemical materials for fly-control purposes is definitely limited by excretion of insecticides or their breakdown products in milk, change in the resistance of insects to insecticides, and the short period of activity of repellents. Therefore, new approaches to fly control should be considered, along with improvement of methods in present use.

Several investigators [Pearson, Wilson, and Richardson (3), Pearson (4), and Fryer et al. (1)], working with fly repellent and insecticides on dairy cattle, have concluded that differences among cows were a primary reason for variations of fly susceptibility in their results. Data from tests at the Oklahoma Experiment Station suggested that these differences might be heritable. Therefore, a study was made in which the resemblances in fly susceptibility between dairy cows of known relationships were measured, thus estimating heritabilities.

SOURCE OF DATA

The data available for study were counts of the house fly, Musca domestica Linn., the stable fly, Stomoxys calcitrans (Linn.), and the horn fly, Haematobia irritans (Linn.), taken on lactating cows during 1953, 1954, 1957, 1958, 1959, and 1960.

FOOTNOTES

1 A portion of these data were reported by G. A. Mount in a thesis presented to the Graduate School, Oklahoma State University, in partial fulfillment of the requirements for the M.S. degree (1960).

2 Present address: Animal and Dairy Science Department, University of Rhode Island, Kingston, Rhode Island.






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