EN
Studies were performed on 40 sheep infested by coccidia and Strongyloides papillosus divided into four groups. Group I received Vita-E-selen at a dose of 0.1 mg/kg b/w; group II was treated with Systamex at a dose of 7.5 mg/kg b/w; group III received both preparates; and group IV - untreated - served as a control. Vita-E-selen and Systamex were applied at the period of sexual maturation, before mating, at the first week of gestation, 7 days before parturition and 7 days after weaning. Vita-E-selen and Systamex did not affect extensiveness of S. papillosus infestation to the greatest extent during drying period, mating, gestation and delivery. Moreover, there was noted some synchronization of Eimeria spp. and S. papillosus invasion; when increased extensiveness of S. papillosus invasion decreased extensiveness of coccidial infestation. This observation can be explained by the competition of these parasites in colonizing intestinal mucosa and by induced immunity.