Abstract
SUMMARY Anthelmintic treatment of ewes in late pregnancy, utilizing a formulation of fenbendazole incorporated in a feed-block carrier, resulted in a significant depression of the peri-parturient faecal egg count rise, which in turn delayed both the build-up of pasture larval contamination and infection in lambs. These results were confirmed by field observations but when considering this method of anthelmintic treatment, the variable intake of feed-blocks dependent upon the availability of grazing and other supplementary feeding, must be taken into account and animals acclimatized to block feeding accordingly.
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