The influence of cattle lice (Damalinia bovisandLinognathus vituli) on weight gain in beef animals

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Abstract
Extract It has been contended in the farm ad-visory literature that cattle lice retard weight gain in beef cattle (USDA Leaf-let No. 319 (1951), USDA Farmers' Bulletin No. 909 (1940), NZDA Advisory Leaflet No. 21 (1969)). These claims are supported, to some extent, by the studies of Kemper et al. (1948) Kemper, H. , Cobett, N. G. , Roberts, I. H. and Peterson, H. O. 1948. DDT emulsions for the destruction of lice on cattle, sheep and goats. Am. J. vet. Res., 9: 373–378. [Google Scholar] and Mattysse (1946) Matthysse, J. G. 1946. Cattle lice, their biology and control. N.Y. agric. exp. Sta. Ball. No. 832, : 66–66. [Google Scholar] . However, other authors (Scharff, 1962 Scharff, D. K. 1962. An investigation of the cattle louse problem. J. econ. Entomol., 55: 684–688. [Google Scholar] ; Utech et al., 1969 Utech, K. B. W. , Wharton, R. H. and Wooderson, L. A. 1969. Biting cattle-louse infestations related to cattle nutrition. Aust. vet. J., 45: 414–416. [Google Scholar] ; Ely and Harvey, 1969 Ely, D. G. and Harvey, T. L. 1969. Relation of ration to short-nosed cattle louse infestations. J. econ. Entomol., 62: 431–434. [Google Scholar] ) could find no evidence of an association between average daily weight gains and numbers of lice present on cattle.

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