| 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 ... | 1979 | 551181 |
| 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 ... | 1978 | 754122 |