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Changes in parasite transmission stage excretion after pheasant release

AuthorsVillanúa, Diego; Acevedo, Pelayo ; Höfle, Ursula ; Rodríguez, Óscar ; Gortázar, Christian
Issue Date2006
PublisherCABI Publishing
CitationJournal of Helminthology 80: 313- 318 (2006)
AbstractThe production of parasite transmission stages was investigated in the faeces of 77 farm-bred ring-necked pheasants (Phasianus colchicus). Coccidian oocysts (Eimeria sp.), and nematode eggs (Heterakis sp., and Capillaria-like eggs) were recovered before and after release but all birds were treated prior to release. Treatment with fenbendazole significantly reduced the abundance of trans-mission-stage excretion for all parasites, and reduced the prevalence in the case of Eimeria sp. and Heterakis sp. Nonetheless, a significant increase in the excretion abundance for all parasites and in the prevalence of Eimeria sp. and Heterakis sp. was found after release. Eggs of Ascaridia sp. were found only after releasing, suggesting infection ocurred in the wild. A negative relationship was found between the pheasant body condition and Heterakis excretion abundance and a higher abundance of Capillaria sp. eggs in female birds. No significant relationship was found between parasite excretion abundance and pheasant survival. Despite this, results suggest that an increase in the excretion of parasite transmission stages follows the release of captive pheasants into the wild. This can in part explain restocking failures, but also means that autochtonous free-living birds may become exposed to new and potentially harmful pathogens. To avoid these risks it is proposed that improved prophylactic measures should be taken. © CAB International, 2006.
Identifiersdoi: 10.1076/JOH2006344
issn: 0022-149X
Appears in Collections:(IREC) Artículos
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