the seasonal incidence of helminth parasites of cattle in the northern transvaal bushveld.during a period of 14 months two tracer calves per month were slaughtered after one month's exposure to natural helminth infestation on a farm in the northern transvaal bushveld. total parasitic helminth burdens, which were never large, were determined in order to define their seasonal incidence. the gastro-intestinal parasites that were recovered were bunostomum phlebotomum, cooperia pectinata, cooperia punctata, haemonchus placei, oesophagostomum radiatum and trichostongylus spp. of these coop ...1979551181
parasites of domestic and wild animals in south africa. xi. helminths in cattle on natural pastures in the northern transvaal.after being exposed to infestation for 4 to 6 weeks, pairs of tracer calves were slaughtered to determine the seasonal incidence of helminth infestation in cattle on natural pasture. haemonchus placei was recovered from march-july and from november-february, and peak burdens were recorded during december and january. there was marked inhibition in larval development from april-july. trichostrongylus spp. were recovered from march-june and from november-february, the greatest number of worms bein ...1978754122
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