Abstract
Insecticides exhibiting systemic action against cattle grubs, Hypoderma bovis (L.) and H. lineatum (De Vill.) in their migrating stages have been tested extensively during the last 4 years. Work on various aspects of this problem has been in progress at the South Dakota Agricultural Experiment Station throughout this period (Rogoff & Kohler 1959). The work reported here was done in the 1955–56 and 1956–57 grub seasons, wherein an attempt was made to evaluate the administration of a chemical in the grain ration of cattle fed in a dry lot. This mode of administration appeared to be a practical method of dosing cattle for grubs.
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