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Biological control of trichostrongyles in calves by the fungus Duddingtonia flagrans fed to animals under natural grazing conditions |
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| Authors: | M Larsen P Nansen J Wolstrup J Grnvold S A Henriksen A Zorn |
| Institution: | a Danish Centre for Experimental Parasitology, Department of Veterinary Microbiology, Royal Veterinary and Agricultural University, 13 Bülowsvej, DK-1870, Frederiksberg C, Denmark b Microbiology Section, Department of Ecology and Molecular Biology, Royal Veterinary and Agricultural University, 21 Rolighedsvej, DK-1958, Frederiksberg C, Denmark c Section of Zoology, Department of Ecology and Molecular Biology, Royal Veterinary and Agricultural University, 13 Bülowsvej, DK-1870, Frederiksberg C, Denmark d National Veterinary Laboratory, 27 Bülowsvej, DK-1790, Copenhagen V, Denmark |
| Abstract: | The present study was conducted in the 1993 grazing season with yearling calves exposed to a pasture with a natural mixed trichostrongyle larval infection. It was shown that daily feeding with the microfungus Duddingtonia flagrans during the first 2 months of the season led to a lowered herbage infectivity and a reduced acquisition of Ostertagia sp. and Cooperia sp. later in the season. In addition, the procedure delayed the onset of clinical disease. This was due to the nematode-destroying effects of the fungi in the dung excreted by the fungus-treated calves, as evidenced by results from a parallel in vitro assay on faecal larval cultures. The paper discusses future research needs before practical biological control can be implemented. |
| Keywords: | Cattle-Nematoda Ostertagia spp Cooperia spp Control methods-Nematoda Nematode-destroying fungi Duddingtonia flagrans Biological control |
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