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A total of 80 animals were studied during 4 rainy seasons (October to April) from 1991-95 (Brazil). Treatments against H. irritans were conducted. Despite the low number of flies per cattle, there was a significant liveweight gain (P<0.05) in favour of the treated groups than in the control groups.

Bianchin, I.; Koller, W. W.; Alves, R. G. de O.; Detmann, E.
Centro de Ciências Rurais, Universidade Federal de Santa Maria, Santa Maria, Brazil
Ciência Rural, 2004, 34, 3, pp 885-890