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Survival of model helminth eggs and larvae (Ascaris suum, Oesophagostomum sp.) in the ensilaging process

JURIS P, RATAJ D, ILAVSKA I, ZILAKOVA J, KNOTEK S, VASILKOVA Z
Veterinarni Medicina 42, 1997, 165-169

Ascaris suum nonembryonated eggs remained viable for the most part even after 42, days of ensilaging. At the end of the anaerobic fermentation, mean of damaged eggs was 15.2 +/- 4.02 (min. 11, max. 21), 32.9%. Conversely, the viability of Oesophagostomum sp. nonembryonated eggs and infective L3 larvae was reduced - eggs: mean number 23.6 +/- 3.64 (min. 20, max. 28) specimes (93.3%), L3 larvae: mean number 24.2 +/- 4.38 (min. 19, max. 28) specimes (96,7%), during the period of study (42 days). Control group of the same helminth propagative stages, was kept under optimum aerobic conditions. After 42 days of exposition, 9.0 +/- 3.46 (min. 5, max. 11) nonembryonated Ascaris suum eggs (12.9%), 17.33 +/- 2.51 (min. 15, max. 20) Oesophagostomum sp. eggs (36.4%) and 3.66 +/- 1.15 (min. 3, max. 5) Oesophagostomum sp. larvae L3 (6.3%) were damaged on average. Helminth eggs, thick-walled and more resistant to the environment in particular, are able to survive the anaerobic process of ensilaging. To protect animals against parasitic diseases, it is necessary to consider the epidemiological hazard of silages and silage juices, which are potentially contaminated by helminth propagative stages. Silages and silage juices under certain conditions may become harmful to polygastric animals


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