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In autumn, experimental animals were drawn from three herds that had grazed pasture during the previous winter and spring. One herd of two-year-old steers had had ostertagiasis during that period. The other two herds, one of three-year-old heifers and one of ten-month-old weaners, were apparently...

Cummins, L. J.; Callinan, A. P. L.
Veterinary Record, 1979, 104, 4, pp 77-78