Further studies on the epizootiology of nematode parasites of sheep in the Karoo.
نویسنده
چکیده
VILJOEN, J . H . Further studies on the epizootiology of nematode parasites of sheep in the Karoo. Onderstepoort J. vet. Res., 36 (2) , 233-264, (1969). The dominant parasites in the Karoo are Nematodirus spathiger (Railliet , 1896) and Trichostrongylus falculatus Ransom , 1911 . In the moister eastern regions Haemonchus contortus (Rudolphi, 1803) and Oesophagostomum columbianum (Curtice, 1890) occur but they decrease markedly as the region becomes more arid . Ostertagia circumcincta (Stadelmann , 1894) is of little or no significance. The free-living stages of N. spathiger are highly resistant to heat and desiccation, but T. fa lculatus cannot survive if the mean monthly mean temperatures exceed 20°C and even if the monthly rainfall exceeds 50 mm , there is but a slight increase in worm burdens. Both species reach peak worm burdens in winter. The presence of H . contortus or possibly 0. columbianum has a deleterious effect on N. spathiger. Strategic drenching is recommended in March and July and tactical drenching when climatic conditions are favourable .
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عنوان ژورنال:
- The Onderstepoort journal of veterinary research
دوره 36 2 شماره
صفحات -
تاریخ انتشار 1969