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Rintal 2.4% premix (Bayer) in single dose 7.5 mg of active substance on kg body weight was given to the calves of red and fallow deer. Effectiveness of deworming against nematodes from family Trichostrongylidae was 85.2% in red and 97.8% in fallow deer. Against namatodes from genus Trichocephalus the effectiveness was higher extending in red deer 98.1%, and in fallow deer 99.5%. Anthelmintic was not effective against nematodes Varestrongylus sagittatus and Elaphostrongylus cervi.
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Odrobaczanie danieli Fenbesanem w hodowli fermowej

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Post mortem examination of 8 fallow deer before and 7 after deworming with Fenbesan in dose 7.5 mg/kg body weight during three following days administrated per os, showed unaequal sensibility of different species of gastrointestinal nematodes on this medicament. Especialy resistant to this drug were nematodes Ostertagia drozdzi and O. leptospicularis, and their percentage index of invasion intensity increased considerably after deworming. It can be a beginning of drug resistance. It is necessary to use different drugs to avoid it.
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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