Abstract
A study of the development and survival of the infective larvae of the common strongylate nematodes of cattle at Nsukka, eastern Nigeria, from September 1981 to March 1982 showed that the dry season (November to March) was generally unfavourable for preparasitic development and survival of Cooperia, Haemonchus and Trichostrongylus species. However significant development may occur during the last two months of the season as a result of the small amounts of rain that usually fall at that time of the year. It was shown, using tracer goat kids, that only paddocks contaminated late in the dry season were infective at the start of the rainy season and that March contamination, in particular, is an important source of the 'early rains' (April/May) rise in herbage infestation commonly observed.
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