The diseases of poultry (1899) The diseases of poultry diseasesofpoultr00salmrich Year: 1899 disp:asks oi- 185 cruslK'il into powder. A microscopic exainiuation of this powder reveals numerous mites and the debris which they produce. The disease appears in ])oultry-yards as a conse- quence of the introduction of one or more birds al- ready' affected. It is readily communi- cated , develops rapid - ly and in a few days a whole flock is con- taminated. It usually begins on the rump, the transfer of con- tagion being effected bj' copulation, and spreads rapidly to the back, the thighs
The diseases of poultry (1899) The diseases of poultry diseasesofpoultr00salmrich Year: 1899 disp:asks oi- 185 cruslK'il into powder. A microscopic exainiuation of this powder reveals numerous mites and the debris which they produce. The disease appears in ])oultry-yards as a conse- quence of the introduction of one or more birds al- ready' affected. It is readily communi- cated , develops rapid - ly and in a few days a whole flock is con- taminated. It usually begins on the rump, the transfer of con- tagion being effected bj' copulation, and spreads rapidly to the back, the thighs and the belly. An infest- ed cock will rapidly infect all tlie fowls in a poultry-yard. Often the head and the up - ])er surface of the neck are affected early in the course of the disease. The feathers fall off at all these points, and finally the skin is denuded over a large extent of surface. The large feathers of the tail and wings and the wing-coverts are generally retained. The denuded skin presents a normal appearanceâ it is smooth, soft, of a pinkish color and not percepti- bly thickened. By pulling out the feathers which remain near the invaded parts, it is easy to find, with both fowls and pigeons, a mass of epidermic scales at Fit;-. 4'>.â/C/'/,/,>â /iio/hs bilohoius of the fowl; feniali', seen on the ventral surface; magnilied 15J diameters.
Size: 1229px × 1627px
Photo credit: © Bookend / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: archive, book, drawing, historical, history, illustration, image, page, picture, print, reference, vintage
