Abstract
Hereford calves from Sweet Grass County, Montana were treated late in January with dimethoate for control of larvae of cattle grubs (Hypoderma spp.). The compound was administered either as a single injection at 10 mg./kg. or for 10 days in a supplemental feed at 2 mg./kg./day. Intramuscular injection resulted in 81% control and low-level feeding in 79% control of cattle grubs. Of calves receiving dimethoate in the feed or as an intramuscular injection, 80% and 84%, respectively, had fewer than six grubs; however, 56% and 20%, respectively, were completely free of grubs. Of 25 calves receiving dimethoate in the feed only three harbored 60%of the grubs. It would therefore appear that some calves failed to take the supplemental feed, but in those which did, control was good.
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