Infection dynamics of Ascaridia galli in non-caged laying hens

Höglund, Johan; Jansson, Désirée S.

doi:10.1016/j.vetpar.2011.03.031

Cited by 44 publications

(37 citation statements)

References 13 publications

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“…Heat resistance of A. galli eggs was not studied in this paper, yet earlier studies reported that thermal death point of A. galli ranged between 48 to 58°C depending on exposure time (Ackert 1931;Reed O. Christenson 1942). However, investigations on Swedish farms clearly showed that despite using high-pressure (50-80°C) and/or watersteam cleaning, this did not effectively control the spread of the infection (Höglund and Jansson 2011).…”

Section: Discussionmentioning

confidence: 86%

“…A study of infection dynamics of A. galli in laying hens in both organic and conventional farms in Sweden discovered that all flocks became infected following the arrival of the birds with infective eggs presented in the environment (Höglund and Jansson 2011).…”

Section: Statement Of Problemmentioning

confidence: 99%

“…One such case is when the adult worms is occasionally seen in the chicken`s egg. Parasite can migrate up the oviduct through cloaca and participate in the eggformation process (Akinyemi et al 1980;Omran 1982;Höglund and Jansson 2011). Although presence of parasite worm in hen's egg is not considered as hazard for public health, it can cause potential consumer complaint.…”

Section: Pathogenesis and Clinical Symptomsmentioning

confidence: 99%

“…Because infection with A. galli persisted in the environment throughout an earlier study (Höglund and Jansson 2011) despite the fact that mean RH (68.7%) was below minimum moisture requirement of the eggs, it would be interesting to study whether A. galli eggs can recover from desiccation and if so, to what extend the damage can be repaired or the normal physiology can be restored. Speculatively, moisture levels may differ within barns and pastures, leading to the possibility of infective hot-spots.…”

Section: Demonstrated That Eggs Of Haemonchus Contortus Andmentioning

confidence: 99%

See 3 more Smart Citations

Environmental tolerance of free-living stages of the poultry roundworm Ascaridia galli

Tarbiat

Jansson

Höglund

2015

Veterinary Parasitology

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Section: Discussionmentioning

confidence: 86%

Section: Statement Of Problemmentioning

confidence: 99%

Section: Pathogenesis and Clinical Symptomsmentioning

confidence: 99%

Section: Demonstrated That Eggs Of Haemonchus Contortus Andmentioning

confidence: 99%

See 2 more Smart Citations

Environmental tolerance of free-living stages of the poultry roundworm Ascaridia galli

Tarbiat

Jansson

Höglund

2015

Veterinary Parasitology

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“…The number of faecal samples collected during the peak of lay visit from the tagged hens relocated at the end of lay was too few for analysis to be conducted. Deworming was not taken into account in the analysis, because the treated flocks received deworming >11 weeks before the end of lay visit; a previous study has shown that the parasite egg output from A. galli in the faeces typically reappear 2 to 4 weeks after deworming (Höglund and Jansson, 2011).…”

mentioning

confidence: 99%

Associations between and development of welfare indicators in organic layers

Hinrichsen

Riber

Labouriau

2016

Animal

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The retail market share of organic eggs in Denmark is high, and the consumers expect high animal welfare standards in the organic production. Documentation of animal welfare is important, however, knowledge about the associations between animal-based welfare indicators is limited. The aims of the study were to investigate the associations between selected welfare indicators at two ages (peak and end of lay), and to examine the development with age of the chosen welfare indicators. The chosen welfare indicators were Ascaridia galli (roundworm) infection, Heterakis sp. (caecal worm) infection, keel bone damages, back feathering, body feathering, foot damages, comb colour and wounds on the body. An observational study with 12 organic egg farms was conducted in 2012 and 2013 with a total of 214 hens assessed individually at the peak and the end of lay. Insufficient data were obtained on helminth infection at the peak of lay. At the end of lay, all helminth infected hens were positive for A. galli, and only three of them had in addition a Heterakis sp. infection. Foot damages, pale combs and wounds on the body occurred at frequencies <5% and were therefore, together with the prevalence of Heterakis sp. infection, left out of the analysis of associations. A graphical model was used to analyse the associations between the remaining clinical welfare indicators, A. galli infection, housing systems and age of the hens at end of lay. A. galli infection was only directly associated with back feathering at end of lay (P = 0.011) with an increased incidence of A. galli infection in hens with good back feathering. Between the two visits, the prevalence of hens with keel bone damages increased (P < 0.001), and the plumage condition deteriorated (P < 0.001), whereas the number of hens with plantar abscess (P = 0.037) and pale combs (P = 0.020) decreased. No significant differences were found for other foot damages or for skin damage. In conclusion, back feathering at end of lay provided information about a possible helminth infection, but this is not a useful indicator in daily on-farm management. In addition, evidence was found that the deterioration of the plumage condition with age was not only due to accumulation of damage over time.

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Implementation of a targeted treatment strategy for the sustainable control of Ascaridia galli infections in laying hens

Tarbiat

Jansson

Höglund

2022

Veterinary Record Open

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Background: Ascaridia galli is a widespread problem in cage-free egg production. Sustainable control of nematode infections is a key component in this sector. This study investigates the effect of a treatment strategy against A. galli, aiming to propose a guideline for anthelmintic use on commercial poultry farms. Methods: A total of eight flocks of laying hens (a-h) from five commercial poultry farms were included in this study. Faecal samples were collected on a biweekly basis starting at 7-13 weeks post-placement (WPP) and processed using the McMaster method to calculate ascarid egg shedding. Flocks were treated after the threshold of 200 eggs per gram of faeces (EPG) was reached. Results:The highest initial faecal egg count was 6700 EPG at 11 WPP, whereas the lowest was 50 at 8 WPP. The longest delay to detect A. galli was 7 weeks. The lowest and the highest number of treatments were four and six, respectively. The shortest and longest periods between any two treatments were 5 and 22 weeks, respectively. Conclusions: These results suggest that monitoring for A. galli should start at approximately 7 WPP and should be repeated every 8 weeks until hens are 50 weeks old. Treatment should be given only if moderate to high faecal egg counts are observed. Treatments after this point may be repeated every 8 weeks without eventually performing a faecal test. These findings provide practical support to veterinarians and egg producers dealing with ascarid worm infection in laying hens in their production stage.

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Infection dynamics of Ascaridia galli in non-caged laying hens

Cited by 44 publications

References 13 publications

Environmental tolerance of free-living stages of the poultry roundworm Ascaridia galli

Environmental tolerance of free-living stages of the poultry roundworm Ascaridia galli

Associations between and development of welfare indicators in organic layers

Implementation of a targeted treatment strategy for the sustainable control of Ascaridia galli infections in laying hens

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