Investigations were carried out from December 1995 to July 1996 on the deer farm of W. Stefański Institute of Parasitology of the Polish Academy of Sciences in Kosewo Górne (Olsztyn province). On an area of 100 ha, 170 red deer (Cervus elaphus) and 170 fallow deer (Dama dama) grazed in two separate yards. Before the drug administration, 30 randomly collected faecal samples from red and fallow deer were examined quantitatively by flotation and Baermann methods. In the examined animals were found gastro-intestinal nematodes from the Trichostrongylidae family and Trichocephalus genus, Elaphostrongylus cervi tissue nematodes, and Verestrongylus sagittatus and Dictyocaulus noerneri lung nematodes. Specially prepared granulated food which contained 2.5 kg of Ivomec Premix (0.6% of Ivermectine) in 500 kg of granulate, was given to the animals. Red deer and fallow deer received two doses of 0.3 mg Ivermectine per kg of body weight on two consecutive days. To establish the efficacy of treatment, 30 faecal samples from both species of deer were collected and examined 18, 120 and 200 days after drug administration. The treatment showed high effectiveness. Efficacy against THchostrongylidae nematodes was 89.3% in red deer and 95.5% in fallow deer, and against Trichocephalus 91.2% and 100%, respectively. Efficacy against lung nematodes was also high. In red deer it was 90.3% against E. cervi, 95.3% against V. sagitatus and 99.6% against D. noerneri. Fallow deer were completely free from D. noerneri. A high effect of dehelmintisation was observed 120 days after drug administration and some effect was observed even on day 200.
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