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The distribution of Dictyocaulus viviparus among 1,528 cattle grazing on 13 pastures in Hokkaido, Japan, was investigated. Lungworms were observed in 12 pastures. The infection rate was 0.6, 28.8 and 8.7% in the early, middle and late grazing period respectively. The rate was higher in cattle...

Ito, S.; Kagota, K.; Hirasawa, K.; Kudo, T.; Taniguchi, R.
Journal of the Japan Veterinary Medical Association, 1972, 25, 12, pp 729-732