Effect of host serum on in vitro oviposition byTrichostrongylus colubriformis(Nematoda)

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Abstract
Oviposition in vitro by female Trichostrongylus colubriformis was reduced after treatment with serum from goats which were infected for over 32 days. Serum from animals at 90 days postinfection reduced, dosage-dependently, in vitro oviposition by female nematodes. Serum and the immunoglobulin G fraction from animals that were immunized with adult worms also reduced egg release. The immunoglobulin G from immunized animals was bound to the cephalic region of the female worm, based on labelling by fluorescein isothiocyanate-conjugated rabbit anti-goat immunoglobulin G. Treatment of females with immune serum from immunized goats that was absorbed with mixed sexes or females of T. colubriformis had no effect on the female's oviposition.