Abstract
Abstract Mixed beef breeds of cow/calves and heifers were separated into 4 groups and treated as follows: 34/31 (cow/calf) untreated (C); 29/29 treated with 10% diflubenzuron boluses at a rate of 2 boluses/cow and 0.5/calf (B); 40/40 tagged with 7.5% Guardian ear tags at rate of 2 tags/hd (ET); and 29/29 treated with both eartags and boluses (calves not bolused)(ET + B), and 33 heifers offered 0.463% Rabon loose mineral ad libitum (RM); Boluses were administered and ear tags attached 8 May. Total number of face flies on the face of each of 10 adult animals and horn flies on one side of the same animals were estimated weekly. Feces from the RM, B, and C groups were collected biweekly and bioassayed with house, face and horn fly larvae.
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