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Oesophagostomum dentatum and Trichuris suis infections in pigs born and raised on contaminated paddocks

Published online by Cambridge University Press:  02 June 2006

H. MEJER  and
A. ROEPSTORFF
H. MEJER
Affiliation:
Danish Centre for Experimental Parasitology, Department of Veterinary Pathobiology, Royal Veterinary and Agricultural University, Dyrlægevej 100, DK-1870 Frederiksberg C, Denmark
A. ROEPSTORFF
Affiliation:
Danish Centre for Experimental Parasitology, Department of Veterinary Pathobiology, Royal Veterinary and Agricultural University, Dyrlægevej 100, DK-1870 Frederiksberg C, Denmark
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Abstract

Transmission of Oesophagostomum dentatum and Trichuris suis was studied in outdoor reared pigs. Six farrowing paddocks were naturally contaminated in May to mid-June 2001 by experimentally infected seeder pigs. In early July 1 sow farrowed on each paddock and starting at week 3 post-partum (p.p.) the offspring was slaughtered serially every 2 weeks for parasite recovery. Faeces were collected regularly for parasite egg counts and acid-insoluble ash (AIA) content as an indicator of geophagy. Weaning took place at week 7 p.p. by removing the sow. Paddock infection levels were estimated in mid-June (O. dentatum) and late November (O. dentatum and T. suis) using helminth-naïve tracer pigs. Soil and vegetation samples were collected regularly. Despite a high initial contamination by the seeder pigs, O. dentatum paddock infectivity was negligible to low throughout the raising of the experimental piglets, which had a slow accumulation of nodular worms ending with a mean of 422 worms/pig at week 19 p.p. As only few eggs developed to infectivity overall T. suis transmission was minimal. The first T. suis were recovered at week 11 p.p. and the highest mean burden of 21 worms/pig was recorded at week 19 p.p. The experimental pigs initially had a high faecal level of AIA although it decreased over time. The results are discussed in relation to the biological characteristics of the 2 parasites and their occurrence in organic pig production.

Keywords

Oesophagostomum dentatumTrichuris suispigstransmissiongeophagyoutdoor production
Type
Research Article
Information
Parasitology , Volume 133 , Issue 3 , September 2006 , pp. 295 - 304
Copyright
2006 Cambridge University Press

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