Outward signs of the leukotic diseases are mostly non-specific. They include inappetence, weakness, diarrhea, dehydration and emaciation. In Lymphoid Leukosis, especially, there may be abdominal enlargement. The combs may be pale, shriveled, or occasionally cyanotic.
Mortality tends to be chronically higher than normal for a prolonged period. Morbidity (percentage of sick birds) is low.
- Causing Agents
- Viral disease. Virus (Retroviridae family), Neoplastic Disease. Lymphoid Leukosis. These are the oncogenic virus (otherwise known as oncoviruses or tumor viruses).
- Affected Systems/Organs
- Tumors invariably involved: Bursa. Liver. Spleen, Kidney and others visceral organs.
- Congenital (from parents) transmission is most important. Bird to bird transmission is poor but infection may occur through the feacal oral route.
- Mainly Affects
- Biosecurity, all-in/all-out production system. Control arthropods. Hygiene.
- Suggested Actions
- Can be confirmed with clinical signs and gross lesions
- 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
Y.M. Saif.2008.Disease of Poultry. 12th Edition.
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.