. Diseases of domesticated birds. Poultry; Poultry; Birds. 102 DISEASES OF DOMESTICATED BIRDS feet may be termed a " bird ; Prompt attention in sucb cases nearly always saves tbe life of tbe fowl. The disease spreads rapidly through a flock affecting a large per- centage of the birds and causing the death of a variable percentage according to the virulence of the virus. Young birds are especially susceptible, adults less so, and a few exhibit complete resist- ance. Morbid anatomy. The external lesions have the appearance of wart-like growths prominently raised from the surface
. Diseases of domesticated birds. Poultry; Poultry; Birds. 102 DISEASES OF DOMESTICATED BIRDS feet may be termed a " bird ; Prompt attention in sucb cases nearly always saves tbe life of tbe fowl. The disease spreads rapidly through a flock affecting a large per- centage of the birds and causing the death of a variable percentage according to the virulence of the virus. Young birds are especially susceptible, adults less so, and a few exhibit complete resist- ance. Morbid anatomy. The external lesions have the appearance of wart-like growths prominently raised from the surface of the skin. The size may vary to a considerable degree according to location, or through combination of several nodules. General- ly they have a diameter of V^ to ^ of an inch. These pox tumors occur chiefly on the unfeathered or lightly feathered por- tions of the body, and par- ticularly on the comb, wat- tles, eyelids and at the commissures of the beak. They may also be found at Fig. 8. Head of a Plymouth Rock cock affected ^Jj^gg q^ ^Jjg under surface with epithelioma contagiosum (bird pox). . (Kiee) 01 the Wings, particularly if there has been an abrasion or bruise at this point. They may be rarely observed around the vent. The nodules first appear as small whitish points which rapidly increase in size, reaching their maxi- mum size in four to six days. They form an integral part of the epithelium, being in reality an extrusion of enlarged epithelial cells. If the superficial scale of exudate is removed, the tumor will be seen to consist of whitish cylindrical masses arranged perpendicularly to the skin. The mass assumes a yellowish color which later changes to a dark brown or black as the tuberosity degenerates and develops. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ward, Archibald Robinson, 187
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectbirds, booksubjectpou
