Rearing the Long-Nosed Cattle Louse and Cattle Biting Louse on Host Animals in Oregon12

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Abstract
During the spring and summer months in the Willamette Valley of Oregon, populations of cattle lice normally decline. However, when the cattle were restrained from self-grooming, small natural infestations of the long-nosed cattle louse, Linognathus vituli (L.) , as well as populations transferred to noninfested hosts, invariably built up to large numbers and persisted. Mixed populations of L. vituli and the cattle biting louse, Bovicola bovis (L.), built up simultaneously on the same host. L. vituti tended to congregate on the lower and B. bovis on the upper body regions. This. finding suggested the existence of some, degree of antagonism between the 2 species, since when either was the sole infesting louse it tended to occupy most. body regions with considerable uniformity. When an infected host was allowed to self-groom, it quickly reduced or entirely eliminated its population of lice.

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