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Biological control of trichostrongylid infections in calves on pasture in Lithuania using Duddingtonia flagrans a nematode-trapping fungus

Published online by Cambridge University Press:  12 April 2024

M. Šarkunas ,
M. Larsen ,
P. Nansen  and
J.W. Hansen
M. Šarkunas*
Affiliation:
Lithuanian Veterinary Academy, Department of Infectious Diseases, Tilzes 18, 3022 Kaunas, Lithuania Danish Centre for Experimental Parasitology, Institute for Veterinary Microbiology, The Royal Veterinary and Agricultural University, Ridebanevej 3, DK-1870 Frederiksberg C, Denmark
M. Larsen
Affiliation:
Danish Centre for Experimental Parasitology, Institute for Veterinary Microbiology, The Royal Veterinary and Agricultural University, Ridebanevej 3, DK-1870 Frederiksberg C, Denmark
P. Nansen
Affiliation:
Danish Centre for Experimental Parasitology, Institute for Veterinary Microbiology, The Royal Veterinary and Agricultural University, Ridebanevej 3, DK-1870 Frederiksberg C, Denmark
J.W. Hansen
Affiliation:
Food and Agriculture Organization of the United Nations, Viale delle Terme di Caracalla, 00100 Rome, Italy
*
*Fax: +37 07 36 35 59 E-mail: minsar@lva.lt
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Abstract

The effect on the pasture contamination level with infective trichostrongylid larvae by feeding the nematode-trapping fungus, Duddingtonia flagrans at two dose levels to first time grazing calves was examined in Lithuania. Thirty heifer-calves, aged 3–6 months, were divided into three comparable groups, A, B and C. Each group was turned out on a 1.07 ha paddock (a, b and c). The paddocks were naturally contaminated with infective trichostrongylid larvae from infected cattle grazing the previous year. Fungal material was fed to the animals daily during a two month period starting 3 weeks after turnout. Groups A and B were given 106 and 2.5×105 chlamydospores per kg of live weight per day, respectively, while group C served as a non-dosed control group. Every two weeks the heifers were weighed and clinically inspected. On the same dates, faeces, blood and grass samples were collected. From mid-July onwards, the number of infective larvae in grass samples increased markedly (P<0.05) on paddock c, whereas low numbers of infective larvae were observed on paddocks a and b grazed by the fungus treated groups. However, the results indicate that administering fungal spores at a dose of 2.5×105 chlamydospores per kg live weight per day did not significantly prevent parasitism in calves, presumably due to insufficient suppression of developing infective larvae in the faeces. In contrast, a dose of 106 chlamydospores per kg lowered the parasite larval population on the pasture, reduced pepsinogen levels (P<0.05), and prevented calves from developing parasitosis.

Type
Research Article
Information
Journal of Helminthology , Volume 74 , Issue 4 , December 2000 , pp. 355 - 359
Copyright
Copyright © Cambridge University Press 2000

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