Poultry and duck diseases-avian leucosis complex (alc), Biology

Avian leucosis complex (ALC)


The disease in poultry is caused by an RNA virus classified under avian type C Retrovirus group under the family Retroviridae.


Epidemiology: Avian leucosis viruses are endemic in virtually all flocks of chickens. The clinical manifestation is sporadic in birds over 14 weeks of age with an incidence rate of around 3%. However, in some lines of birds the incidence rate may reach up to 20%.


Symptoms: The clinical sings in affected birds show pale comb, shriveled, cyanotic and enlarged abdomen. On autopsy, tumors occur in liver, spleen, bursa and in a few other internal organs. Microscopically the lesions reveal multicentric aggregates of lymphoblasts.


Diagnosis:
ALC is diagnosed by complement fixation test (CFT), radioimmunoassay (RIA) and ELISA for group specific antigens. Tests for reverse transcriptase, immunohistochemical tests; virus isolation methods etc. are available for laboratory confirmation of the disease. There is no effective vaccine available to control this disease.
Treatment and control: It is controlled through

(i) establishing leucosis - free breeding flocks by a routine screening and breeding programme

(ii) strict hygienic conditions on the premises to ward off lateral transmission of the virus

(iii) encouraging breeds derived from ALC- resistant flocks.

Posted Date: 9/18/2012 9:26:47 AM | Location : United States







Related Discussions:- Poultry and duck diseases-avian leucosis complex (alc), Assignment Help, Ask Question on Poultry and duck diseases-avian leucosis complex (alc), Get Answer, Expert's Help, Poultry and duck diseases-avian leucosis complex (alc) Discussions

Write discussion on Poultry and duck diseases-avian leucosis complex (alc)
Your posts are moderated
Related Questions
How to improve the Quality of Protein in the Diet? Since the net protein utilization (NPU) values of milk or egg proteins are higher than those of proteins of average diets con

Q. From the intestinal lumen through to the tissues - what is the route of nutrients after digestion? Monosaccharides, mineral salts, amino acids and water are absorbed by the

How is the chromosome region where the centromere is located called? How are chromosomes classified in relation to the position of their centromere? The chromosome region where

What is parasitism? Parasitism is the ecological interaction in which a being lives at the expense of another. The parasite often does not cause immediate death of the host sin

Structure of human testis: The male reproductive system consists of a pair of testis. Testis are male reproductive organs and produce (male gametes) sperms and also secrete

(a)State the law of independent assortment. (b )Using punnett square demonstrate the law of independent assortment in a dihybrid cross including two heterozygous parents.

in humans, maleness of is determined by a pair of sex chromosomes called X and Y. (a)what is the genotype for males? (b)what is the genotype for females?

Why is it important for core body temperature to stay more constant than skin temperature?

E n r o b e d Meat Products Enrobing/coating of meat products with edible materials enhances the acceptability and creation of variety to meat products. Whole egg liquid,

Polysaccharide - polymer composed of monosaccharide monomers Starch - Energy storage in plants à straight (amylose) and branched (amylopectin) chains of α-glucose Glycogen