0: Nose-rings and transmission of helminth parasites in outdoor pigs. Acta vet. scand. 2000, 41,153-165.-Five growing pigs experimentally infected with low doses of Oesophagostomum denta tum, Ascaris suum, and Trichuris suis were turned out with 5 helminth-naive pigs on each 00 pastures in June 1996 (Group I). On one pasture all pigs received nose-rings. After slaughter of Group I in October, pasture infectivity was monitored using helminth-naive, unringed tracer pigs. In 1997, helminth-naive young pigs were turned out on the contaminated pastures in May (Group 2) and again in August (Group 3). Again all pigs on one pasture received nose-rings. All pigs and pastures were followed parasitologically and reduct ion in grass cover was monitored. Based on the acquisition of infection by the naive pigs in Group I, the estimated minimal embryonation times for eggs deposited on pasture were 23-25 days for 0. dentatum, 5-6 weeks for A. suum and 9-10 weeks for T. suis. Results from tracer pigs and grass /soil samples indicated that pasture infectivity was light both years. Free-living stages of 0. dentatum did not survive the winter. The nose-rings reduced rooting considerably, resulting in threefold more grass cover on the nose-ring pasture compared to the control pastures by the end ofthe experiment. Nevertheless, the nose-rings did not significantly influence parasite transmission.
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