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Infection patterns of Dictyocaulus viviparus in calves.

THE LUNGWORM PARASITE OF CArrLE, Dictyocatdus viviparus has been shown (6) to be widespread in the province of Quebec. Subsequent field studies on infected herds (7) showed the disease to be prevalent during the latter part of the summer and primarily a problem in younger animals. It was also observed that there appeared to be a seasonal inhibition in the development of the infective larvae in cattle associated with the late fall period. The present study was carried out to more closely observe the epizootiological patterns of this parasite in calves over the grazing period. Since it has been reported (11) that there are differences in the disease picture with this parasite, dependent on whether calves are exposed to infection continuously or for only short periods throughout the grazing period, two groups of calves were used, one in which representative animals grazed continuously, the other in which animals grazed for short intervals only. Furthermore, since the phenomenon of seasonal retardation exhibited by this parasite appeared to be a very important feature of its development, it was decided to investigate this feature of the life cycle in greater detail.