Evaluation of Phosmet Flowable as High Pressure Spray and Dursban 44 Pour-On For Lice Control on Beef Cattle, 1985

Abstract

Abstract Experimental steer and heifer calves were of mixed breeds and originated in eastern WY. They were housed in separate pens in groups of 7 animals each at Torrington, WY. The cattle were naturally infested with the cattle biting louse, Bovicola bovis, and the longnosed cattle louse, Linognathus vituli. Lice density was estimated by observing and recording the number of each species at sample sites in the area of the poll, head, shoulder, and topline. One, 15-cm sample site was located across the occipital area directly behind the poll. The equivalent of 3, 15-cm sample sites were located on each of the remaining body areas. Sample sites on the head were 1, 15-cm hairpart on either side of the face from the corner of the mouth toward the base of the ear and 2, 7.5-cm hairparts on either side of the muzzle. The sample sites on the shoulder were 3, 15-cm vertical parts on the right side of the body. These followed the natural parts of the hair. The sample sites on the topline were located on the right side of the animal ca. 25 cm posterior to the withers and 25 cm anterior to the hip bone. The sites consisted of 3 vertical 15-cm hairparts ca, 15 cm apart.