Abstract
Abstract Ectrin ear tags were attached to two herds of beef cattle in June. The first group consisted of 44 adult Angus cows with calves. All cows were tagged in both ears on June 20. The second group consisted of 34 adult Hereford cows with calves and were tagged in one ear on June 21. Calves were not ragged. A third group of similar size, with no fly treatment, served as a control. The groups were separated by at least 2 miles. An assessment of treatment efficacy was made prior to treatment and post-treatment by inspecting 10 head selected at random from each herd at weekly intervals usually between 10-12 a.m. Face flies were counted on the entire face while horn flies were counted on both sides of the entire animal. Binoculars were used to aid counting when necessary. Data was analyzed using Duncan’s Multiple Range Test.
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