<i>Oesophagostomum dentatum</i>and<i>Trichuris suis</i>infections in pigs born and raised on contaminated paddocks

Mejer, Helena; Roepstorff, Allan

doi:10.1017/s0031182006000382

Cited by 8 publications

(11 citation statements)

References 31 publications

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“…resulted from eggs ingested when the pigs were approximately 1½ weeks old and had gained access to the outdoor run. The same piglets were shown to have had ingested considerable amounts of soil by the age of 3 weeks (Mejer and Roepstorff, 2006) confirming that even very young piglets are likely to become infected if contained in a contaminated environment. Compared to the further findings of on larval migration rates, the worm recoveries from the lungs and small intestine at week 5 p.p.…”

Section: Discussionmentioning

confidence: 71%

“…could indicate a decreased fertility and/or the beginning of the elimination of worms. However, it may also be due to an unexplainable systematic error as the excretion of O. dentatum eggs showed a similar decrease (Mejer and Roepstorff, 2006). From an economical point of view, expulsion of large A. suum after week 19, i.e.…”

Section: Discussionmentioning

confidence: 94%

“…A detailed description of the experimental design and methods are given by Mejer and Roepstorff (2006). Therefore, paddocks, animal groups, and procedures will only be presented briefly below, except for methods relating specifically to A. suum.…”

Section: A T E R I a L S A N D M E T H O D Smentioning

confidence: 99%

“…The CI can be used for comparison of pastures contaminated by pigs of the same size but do not in it self represent an estimate of the total egg outputs per paddock as the actual faecal volumes were not known. However, using assumed faecal outputs according to body weight (A. Chwalibog, personal communication 2004) estimates of the total number of eggs excreted by the seeder pigs were calculated (see Mejer and Roepstorff, 2006). Body weight was registered every fortnight starting at the age of 7 weeks.…”

Section: Seeder Pigs and Parasitesmentioning

confidence: 99%

“…The epidemiology of Oesophagostomum dentatum and Trichuris suis infections of the same pigs was also investigated and these results are reported elsewhere (Mejer and Roepstorff, 2006).…”

Section: Introductionmentioning

confidence: 99%

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Ascaris suuminfections in pigs born and raised on contaminated paddocks

Mejer¹,

Roepstorff²

2006

Parasitology

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The transmission of Ascaris suum was studied in outdoor reared pigs. From May to June 2001, 6 farrowing paddocks were naturally contaminated with A. suum using experimentally infected seeder pigs. Early July, 1 sow farrowed on each paddock. One piglet per litter was slaughtered every second week starting at week 3 post-partum (p.p.) for registration of liver white spots and recovery of A. suum from the lungs and the small intestine. The last pigs were slaughtered at week 19 p.p. Faeces was examined for parasite eggs and blood was analysed for A. suum-specific antibodies. Weaning took place at week 7 p.p. by removing the sow. Paddock infection levels were estimated by regular examination of soil samples and in late June and late November using parasite naïve tracer pigs. Paddock contamination was high but eggs developed slowly resulting in a low initial transmission to the experimental pigs. By week 5 p.p. transmission had increased and the numbers of infective eggs in the soil increased during the study. The results indicate a continuous uptake of infective eggs, but visceral larval migration was reduced with time, probably due to the development of a pre-hepatic barrier. Nevertheless, a rather large population of adult worms remained in the pigs throughout the study, and it may primarily have been eggs ingested in the early infection phase that gave rise to the patent infections. It is suggested that neonatal exposure may result in increased persistence and size of adult worm burden and that the higher ‘life-time worm burden’ may be of significant economic importance.

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Section: Discussionmentioning

confidence: 71%

Section: Discussionmentioning

confidence: 94%

Section: A T E R I a L S A N D M E T H O D Smentioning

confidence: 99%

Section: Seeder Pigs and Parasitesmentioning

confidence: 99%

“…The epidemiology of Oesophagostomum dentatum and Trichuris suis infections of the same pigs was also investigated and these results are reported elsewhere (Mejer and Roepstorff, 2006).…”

Section: Introductionmentioning

confidence: 99%

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Ascaris suuminfections in pigs born and raised on contaminated paddocks

Mejer¹,

Roepstorff²

2006

Parasitology

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Detection of Antibodies Against Paracoccidioides brasiliensis in Free-Range Domestic Pigs (Sus scrofa)

et al. 2014

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Paracoccidioidomycosis, caused by the thermodimorphic fungus Paracoccidioides brasiliensis, is a human systemic mycosis prevalent in Latin America. Paracoccidioidomycosis affects mainly male rural workers, causing granulomatous lesions in several organs such as the lungs, liver and spleen. The participation of other animal species in the fungus epidemiology is not well understood. The objective of this study was to evaluate the infection of free-range domestic pigs by P. brasiliensis. Serum samples from 106 pigs were analyzed by ELISA and the immunodiffusion test, using P. brasiliensis gp43 and exoantigen as antigens, respectively. The overall positivity to gp43 in ELISA was 37.7 %, although no reactivity was observed in the immunodiffusion test and nor was P. brasiliensis detected in tissue samples (spleen, lung, liver and lymph nodes) from slaughtered animals submitted to culture, histopathological examination and PCR analysis. Five pigs seronegative to gp43 were exposed to natural infection by P. brasiliensis, and all animals seroconverted 3 months after exposure. The results suggest that free-range pigs are frequently infected with P. brasiliensis but are resistant to disease development. This is the first report of paracoccidioidomycosis in pigs.

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Nematode parasite eggs in pasture soils and pigs on organic farms in Sweden

et al. 2019

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The EU regulation for organic pig production requires outdoor access to promote the animal welfare. This may increase the risk of infection of the common pig parasites, Ascaris suum and Trichuris suis, because their eggs can survive for many years in the soil. The egg contamination of these parasites in outdoor areas with different managements and the faecal egg output from the pigs was investigated on 11 Swedish organic pig farms in 2008. We found eggs of A. suum and, to a minor extent, T. suis in the soil from outdoor areas, which had previously been used for pig rearing and/or for spreading of pig manure. Piglets and their dams were turned out on pastures included in a crop rotation, and these areas had a mean of 2500 A. suum and 40 T. suis eggs per kilogram soil. When the pigs were 12-week-old, the faecal egg counts (FECs) of A. suum were positively correlated with the egg concentration in pasture soils before pig turnout. The areas used by dry sows had a mean of 11,700 A. suum and 220 T. suis eggs per kilogram soil. The highest egg concentrations in the soil were found in areas, frequently used by pigs in the most recent years. To minimise pasture contamination with parasite eggs, it is advised to have a crop rotation system and to inactivate parasite eggs in pig manure before spreading it. Parasite control needs further development to protect suckling piglets from infections due to environmental parasite egg contamination.

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Oesophagostomum dentatumandTrichuris suisinfections in pigs born and raised on contaminated paddocks

Cited by 8 publications

References 31 publications

Ascaris suuminfections in pigs born and raised on contaminated paddocks

Ascaris suuminfections in pigs born and raised on contaminated paddocks

Detection of Antibodies Against Paracoccidioides brasiliensis in Free-Range Domestic Pigs (Sus scrofa)

Nematode parasite eggs in pasture soils and pigs on organic farms in Sweden

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