By P. Seneviratna
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Extra resources for Diseases of Poultry. (Including Cage Birds)
Example text
In the discrete form there are chalky or cheesy white friable tumours in the liver and spleen and cauliflower-like growths in the periosteum of the keel, ribs, and pelvis. D. —The virus causing this condition appears to be related to that causing lymphoid leucosis. It is characterized by increased osteoblastic activity in birds about 2-3 months old and is more common in the male than in the female. The long bones of the extre mities, especially the metatarsi, are thickened, deformed, and boot-like which is characteristic of the disease (Fig.
These may be given in water or food: 200-400 g. of a tetracycline may be given in a ton of feed for 3 weeks. However, this treatment does not cause complete elimination of the virus which may become drug resistant. Many recovered birds are immune but some may be carriers of infection. N o practical method has been used to immunize birds. —To prevent the spread of infection from one bird to another is a difficult matter, as in many instances it often goes unnoticed. However, when the 41 D I S E A S E S OF P O U L T R Y infection has been found in a flock, the flock should be culled.
If baby chicks are inoculated orally with the virus it will produce sneezing. This virus is considered to be the cause of quail bronchitis, which is an acute contagious disease of bobwhite quail causing 50 per cent mortahty (Dubose, 1967). GAL VIRUS INFECTION Pereira, Huebner, Ginsberg, and van der Veen (1963) have described a cytopathogenic adenovires (GAL) virus from fowls. A similar virus has been found to be associated with the virus of infectious laryngotracheitis in Australia. AVIAN ENTERO VIRUS 1394 Dutta and Pomeroy (1967) have isolated an entero virus capable of producing cytopathic effects o n chick embryo cells, necrotic foci in the liver of chick embryos, and large plaques on the chorio-allantoic membranes.