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The studies started on 40 sheep at the age of 7 months infested by gastro-intestinal nematodes, and ended after lambing. 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 was given both the preparates and group IV (untreated) served as a control. The selenium and Systamex preparáte were applied at sexual puberty, before...
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