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Article | 20.08.2025
Lieven Claerhout
The prevalence and impact of worm infections are still often underestimated in daily pig management despite their tremendous effects on health and zootechnical parameters. The absence of specific clinical symptoms in the field is considered to be the main reason. A high prevalence of both Ascaris suum (large roundworms) and Oesophagostomum spp. (nodular worms) was demonstrated in a field study, underlining the importance of strategic deworming programs.
Eleven Danish indoor sow herds with unsatisfactory performance during lactation were selected for parasitological examination of faeces. Herds with poor management, low feed quality or animals suffering from PRRSv and influenza were not sampled. Inclusion criteria for sampling were:
- Increased sow mortality
- Loss of appetite in sows
- Low number of weaned piglets per sow
Faecal samples were taken from five sows and five gilts per herd during the first 7 days after farrowing to perform egg per gram (EPG) counts. Prevalence (Table 1) and infection pressure (Table 2) were evaluated for both worm species.
Prevalence
Table 1. Prevalence (in %) of Ascaris suum and Strongylidae infections
Infection pressure
Table 2 shows the determination of worm infection pressure based on average EPG counts. This was used to determine the infection pressure at herd level (Figure 1).
Table 2. Determination of worm infection pressure from average EPG counts
Figure 1. Infection pressure of Ascaris suum and Oesophagostomum spp. at herd level
Conclusion
Ascaris suum and Strongylidae (Oesophagostomum spp.) worm infections were highly prevalent among herds. A significant difference in prevalence between sows and gilts was not demonstrated. A moderate to high infection pressure was detected in 45% of the herds for each of the worm species.
Courtesy of J.B. Sanden and H. Bundgaard, Porcus Denmark, IPVS 2024
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