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In 4 parasitized yearling heifers killed 96 hours after treatment with a preparation containing 90% bephenium hydroxynaphthoate (Franten) at the rate of 250 mg. per kg. body wt, the reduction in the number of worms recovered as compared with 4 paired untreated heifers was: 85% for Ostertagia...

Eisa, A. M.; Rubin, R.
American Journal of Veterinary Research, 1961, 22, pp 708-712