title: Parasites of domestic and wild animals in South Africa. XI. Helminths in cattle on natural pastures in the Northern Transvaal.
abstract: 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 being recorded during December. Cooperia spp. infestation occurred from March-August and November-February with peak burdens during April-June and December. From February-August more than 50% of the worms recovered were in the 4th larval stage of development. The greatest number of Oesophagostomum radiatum were recovered from June-January. Longistrongylus sabie and Impalaia tuberculata, parasites normally found in impala, were recovered from many of the survey animals, this being the first record of their occurrence in cattle.
mesh_terms: D000818:Animals; D000829:Animals, Domestic / Q000469:parasitology; D000835:Animals, Wild / Q000469:parasitology; D002417:Cattle / Q000469:parasitology*; D006189:Haemonchus; D006376:Helminths; D009348:Nematoda; D009815:Oesophagostomum; D010270:Parasite Egg Count; D012621:Seasons; D013019:South Africa; D014251:Trichostrongyloidea