Ruelene Administered Free-choice in a Mineral Mixture for Cattle Grub Control1

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Abstract
Ruelene (4-tert-butyl-2-chlorophenyl methyl methylphosphorami-date) incorporated in a salt-bonemeal mixture (3 to 1 by weight) was offered, at two levels on a free-access basis, to calves for the control of cattle grubs, Hypoderma lineatum (De Vill.) and H. bovis (L.). Ruelene quantities of 8 and 24 grams per pound of the mineral mixture were each offered to a lot of eight calves as their only source of mineral supplement for 62 days beginning in December, 1959. All grubs were killed in the calves in the treated lots while the control lot of calves averaged 25.4 grubs each. No symptoms of toxicity were noticed. Erythrocyte cholinesterase activity was depressed significantly in both treated groups. Ruelene at the higher level reduced palatability of the mixture.