Abstract
The faecal parasite egg output of lambing and non-lambing ewes in two sheep flocks in the dry season of 1975/1976 and 1976/1977 was determined. Ewes wormed at the end of the rainy season showed a very low parasite egg output during the dry season of 1975/ 1976. No periparturient rise of parasite eggs was detectable in the ewes which lambed in December or January. Towards the end of the dry season the parasite egg counts in the faeces increased and the highest counts were observed in lactating ewes. The parasite egg output at the beginning of the dry season was apparently due to recently acquired infections, mainly Trychostronglus sp. The increase in egg output at the end of the dry season was related to the development of inhibited larvae mainly of Haemonchus sp. This development was detectable from the end of February onwards. The differences in parasite egg output during the two seasons was associated with different rainfall patterns during 1975 and 1976.
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