In field studies in New York State in 1978-79, the relationship between feeding by adults of Musca autumnalis Deg., and fly-avoidance behaviour (bunching) and grazing time of heifers was examined in herds that were either exposed to the ambient pest intensity levels or treated with permethrin sprays to suppress fly feeding. The number and duration of bunching episodes was greater in herds exposed to ambient pest activity; also, there were positive correlations between pest intensity and the number and duration of bunching episodes. Heifers with faces protected by bunching were exposed to significantly fewer flies than they were prior to bunching or heifers on the periphery of the aggregation. Total grazing time did not differ between herds, and there was little difference in diel grazing patterns, which indicated that bunching represented modified non-grazing behaviour rather than displaced grazing time.
|Publication Title||Applied Animal Ethology|
|Author Address||Department of Entomology, New York State College of Agriculture and Life Sciences, Cornell University, Ithaca, USA.|
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