Resumen

ZANONIANI, R. et al. Plantago lanceolata effects on the level of Gastrointestinal Nematodes in Sheep. Veterinaria (Montev.) [online]. 2017, vol.53, n.206, pp.8-22. ISSN 0376-4362.

The objective of the present work was to evaluate the antiparasitic effect of Plantago lanceolata (llantén) against Lolium multiflorum (annual rye grass). Forty healthy and castrated 7 months old Merino lambs were used. Were assigned randomly, after being drenched with a broad spectrum antiparasitic drug, in two groups of 20 lambs each to one Hectarea (ha) of Plantago lanceolata cv. Tonic and one ha of Lolium multiflorum cv. Pronto, which were divided into 3 paddocks of 0,33 ha each, and were managed in periods of 14 days on 28 days off the paddocks. Initial forage availability was 1380 kg/ha DM for llantén and 1441 kg/ha DM for rye grass. Evolution of parasite load and animal live weight every 14 days were evaluated, and by variance analysis and mean differences studied. Parasitic genes were evaluated each 28 days and hematocrit determined at the fifth sampling. Both groups maintained low parasitic levels and finished the trial with similar loads. The animals gained weight along the experiment but the second and ninth sampling. No statistical differences were observed in all samplings. Haemonchus spp. and Trichostrongylus spp. prevailed, being Ostertagia spp., Cooperia spp. and Oesophagostomun spp. less important. Normal values for hematocrit and a negative correlation with eggs counts were found. It has been concluded that lambs with slight levels of parasite loads are capable of achieve good live weight gains on pastures with high nutritive levels, and that Plantago lanceolata is suitable for generating a good animal productivity. It could not be demonstrated that condensed tannins had acted on parasitic control.

Palabras clave : Llante; effect anthelmintic; vermin gastrointestinal.

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