Coccidiosis, Duodenum, (E. acervulina) Subclinical Infections in Laying Hens
This species is the most frequently encountered in commercial poultry. Light to moderate infections may produce little effect on weight gain and feed conversion. Egg production may drop in laying hens. Watery and mucous droppings may be observed.
An infection with mid-intestinal species of coccidia is a major predisposing factor for Clostridium sp. infection. Colonization of the small intestine by Eimeria sp. may lead to intestinal mucosal damage which may then, in turn, provide natural substrates (plasma proteins) required for Clostridium sp. proliferation.
- Egg production declines gradually
- Egg production may be depressed in laying hens
- Watery and mucoid droppings may be seen as early as 4 days post exposure
Internal egg quality
- Yolk colour decreased or yolk discoloration or paler yolks may be present
- Causing Agents
- Protozoal Infection parasites Eimera acervulina. Intestinal coccidiosis
- Affected Systems/Organs
- Intestinal Tract Small intestine
- Ingestion of viable sporulated oocysts is the only natural method of transmission. Oocysts can be spread mechanically by many different animals, insects, contaminated equipment, wild birds and dust.
- Mainly Affects
- Egg production and Performance
- Adequate Pullet coccidial immunization program. Anticoccidial drugs. Good hygiene practices, vaccinations, coccidiostat in feed or water.
- Suggested Actions
- Can be managed with feed additives, off-the-shelf medications
- Can be managed with vaccination programs
- 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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Donald D. Bell, Williams D. Weaver. 2009. Commercial Chicken Meat and Egg Production. Fifth Edition.