01371naa a2200229 a 450000100080000000500110000800800410001910000180006024500980007826000090017652007520018565000100093765000130094765000130096065000170097365300180099065300130100865300160102165300130103765300130105077300780106317852181995-08-02       1968    bl ---       0--  u    #d1 aMULLER, G. L.  aThe epizootiology of helminth infestation in sheep in the south-western District of the Cape.  c1968  a1. The epizootiology of nematode parasites of sheep was investigated at the Outeniqua Experimental farm, George, Cape Province. 2. There has a nehative correlation between temperature and the availability of... [xerox ilegivel (parte)] in autumn and winter. 3. The major parasites at  Outeniqua were Trichostrongylus spp., Ostertagia spp. and to a lesser degree H. contortus, Cooperia spp. and Nematodirus spp.  4. Flocks acquired massive worm burdens during the cooler months of the year, from autumn to spring. 5. The massive build-up of retarded fourth stage larvae and immature adults is a physiolo- gical process in the life-cycle, whereby the parasite ensures itself of optimal circumstances for survival against adverse climatic conditions.  asheep  aCarneiro  aHelminto  aInfestação  aEpizootiology  aHelminth  aInfestation  aParasita  aParasite  tOnderstepoort Journal of Veterinary Researchgv.35, n.1, p.159-194, 1968.