Ascaridia galli infection causes weight depression in the host, proportionate to increasing worm burden. In severe infections, intestinal blockage can occur. Chicken infected with a large number of ascarids suffer retarded growth, and increased mortality.
Damage to the intestinal mucosa results in limiting the absorption of carotene and other micronutrients. In older hens unthriftiness and lower production are the only common symptoms.
Hens 3 months of age or older manifest considerable resistance to infection with A. galli, regardless of previous infection status.
Ascaridia galli can also synergized the effects of other diseases conditions, such as coccidiosis and infectious bronchitis. A. galli reportedly contain and transmit avian reovirus. The infection by this nematode is the occasional finding of this parasite in the hen's egg. Infected eggs can be detected by canding.
The nutritional state of the bird also influence the development of immunity.
- Causing Agents
- Parasitic intestinal track infection of nematode. Worm parasites. Ascaridia galli.
- Affected Systems/Organs
- Reproductive system. Intestinal tract.
- Fecal-oral Cycle. The parasites may be transported by grasshoppers and earthworms and are resistant to environmental. A. galli reportedly contain and transmit avian reovirus
- Mainly Affects
- Liveability and egg quality
- Removal of droppings from feeders and drinkers and pasture rotation and regular anti-parasite treatment (as locally approved), especially in young birds and Free range production system. The nutritional state of the bird also influence the development of immunity. Diets high in vitamins A and B (complex) increase the fowl's resistance to A. galli. Increasing levels of dietary calcium and lysine decreased the length and number of worms recovered.
- Suggested Actions
- Can be confirmed with clinical signs and gross lesions
- Technical assistance recommended
- Can be managed with feed additives, off-the-shelf medications
- Diagnosis should be confirmed with rapid assays and/or a certified laboratory
- Veterinary intervention is recommended
Impact on Egg quality
Impact on Liveability
Impact on Production
Overall Economic Impact
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Mark Pattison, Paul F. McMullin, Janet M. Bradbury. Dennis J. Alexander. 2008. Poultry Diseases. 6th Edition.
Paul McMullin. 2004. A pocket Guide to Poultry Health and Disease. First Edition.
Steven Leeson, John D. Summers. 2008. Commercial Poultry Nutrition. Third Edition.
Donald D. Bell, Williams D. Weaver. 2009. Commercial Chicken Meat and Egg Production. Fifth Edition.