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Attempts to control infection with Ostertagia ostertagi (Trichostrongylidae) in grazing calves by adding mycelium of the nematode-trapping fungus Arthrobotrys oligospora (Hyphomycetales) to cow pats

Published online by Cambridge University Press:  05 June 2009

J. Grønvold ,
S. A. Henriksen ,
P. Nansen ,
J. Wolstrup  and
J. Thylin
J. Grønvold
Affiliation:
Royal Veterinary and Agricultural University, Institute of Hygiene and Microbiology, 13, Bülowsvej, DK-1870 Frederiksberg C, Denmark
S. A. Henriksen
Affiliation:
National Veterinary Laboratory, 27, Bülowsvej, DK-1870 Frederiksberg C, Denmark
P. Nansen
Affiliation:
Royal Veterinary and Agricultural University, Institute of Hygiene and Microbiology, 13, Bülowsvej, DK-1870 Frederiksberg C, Denmark
J. Wolstrup
Affiliation:
Royal Veterinary and Agricultural University, Institute of Microbiology, 21, Rolighedsvej, DK-1958 Frederiksberg C, Denmark
J. Thylin
Affiliation:
Chr. Hansen's Bio Systems, 10–12, Bøge Alle, DK-2970 Hørsholm, Denmark
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Abstract

Artificially prepared cow pats containing Ostertagia ostertagi eggs were deposited on two comparable grazing plots at weekly intervals during June and July 1987. Before deposition the cow pats, on the one plot, were inoculated with 0·250 g mycelial fragments per kg of faeces of the predacious fungus Arthrobotrys oligospora. On the other control plot comparable numbers of non-inoculated cow pats were placed at the same time. Subsequently, in July, two equal groups of calves were turned out one on each plot to graze for two months after which they were necropsied. The number of infective O. ostertagi larvae in inoculated cow pats was reduced by 42% and herbage larval infectivity around them by 50–71% as compared with the corresponding parameters in control pats and surrounding herbage. After a grazing period of two months the calves on the plot with inoculated cow pats had acquired worm burdens that were on average 37% lower than those of calves on the control plot. The lower degree of parasitism in these calves was also reflected in lower egg counts, lower serum pepsinogen levels and higher body weight.

Keywords

Ostertagia ostertagiArthrobotrys oligosporaTrichostrongylidaenematode-trapping fungicontrolcow patsecologycattleDenmark
Type
Research Article
Information
Journal of Helminthology , Volume 63 , Issue 2 , June 1989 , pp. 115 - 126
Copyright
Copyright © Cambridge University Press 1989

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