Dr. Murai Éva szerk.: Parasitologia Hungarica 25. (Budapest, 1992)
Table 4 Prevalence of infection in the different groups of animals before the treatment Parasite eggs 1st period of experiment 2nd period of experiment (EPG) L.g. B.bi. B.bi. B. bo. L.g. B. bi. B. bi. B. bo. B. t. T.-strongylus sp. 4 a /3 b -/- -/1 2/1 27l d 1/2 1/5 -A -/S.papillosus -/- 1/- 1/- -/- -/- -/- -A -/- -/Tox. vitulorum -A 1/1 -A -/- -/- -A -A -A -/Trichuris ovis -A -A -A -A -A -A -A -A -/H. contortus -A -A -A -A -A -A -A -A 1/8 Nematodirus sp. -A -A -/- -A -A -A 7- 1/- -/a 4 May (day -7) c 5 October (day -7) L. g. = Lama glama B. bo. = Bison bonasus b 11 May (day 0) d 12 October (day 0) B. bi. = Bison bison B. t.. =Bos taurus p. h. Table 5 Rate of helminth egg shedding (EPG) by animals in the first period (from 11 May to 5 July) and in the second (from 16 October to 11 December) period of experiment Parasite eggs (EPG) Date L. glama B. bison B. bison B. bonasus B. taurus p. h. (a pair) (dam & her son) T-st. sp. H. com. T-st. sp. T.-st. sp. Coop. sp. T-st. sp. H. cont. 11 May 50 17 67 84 50 18 May 34 17 17 8 June 34 17 17 5 July 16 October 84 17 17 17 34 25 October 50 17 17 8 November 25 11 December T-st. sp. = Trichostrongylus sp. H. con. = Haemonchus contortus Coop. sp. = Coopperia sp. DISCUSSION In contrast to the results reported by Wade et al. (1979), Boever (1986), Tessaro (1989), Drozdz et al. (1989), and Cheney and Allen (1989), in this study Trichostrongylus infection was found to be most prevalent in the llamas and in the American as well as European bison. The prevalence of other nematode species (e.g. Nematodirus, Haemonchus, Strongyloides, Cooperia, Trichuris, Toxocara) was relatively low. In contrast, in the Hungarian Grey cattle Haemonchus contortus infection was of decisive importance; apart from that, only Trichostrongylus and Ostertagia species were identified in them. The number of nematodes present gradually decreased after treatment of the animals with Vermitan paste (Sanofi-Chinoin) hidden in their favourite titbits. Infection recurred only if the preparation was not used with sufficient regularity.
