Abstract
Abstract Lice control trials were conducted on fall weaned calves belonging to UN-L or cooperating ranchers during the winters of 1979 and 1982, respectively. The degree of lice infestation was determined by restraining animals and counting lice in two-hand hairparts on the face, dewlap, neck, side, back and tail head (ca 6 sq in hide surface/hairpart). Animals with average lice numbers of 1-3 were termed lightly infested; 3-10 moderate; over 10, heavy. Lice representative of the infestation were removed with forceps and preserved in alcohol for microscopic identification. In these trials, Linognathus vituli was the major species but some animals also were infested with Solenoptes capillatus and/or Bovicola bovis. Treated and untreated animals were maintained separately throughout the 28-day trial period (Jan-Feb). The efficacy ot treatment (% reduction) was calculated on the basis of infested animals vs non-infested animals 28-days post treatment.
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