The diseases of poultry (1899) The diseases of poultry diseasesofpoultr00salm Year: 1899 64 DISHASES OF POULTRY. air-sac mite show no symptoms of disease, and the ex- istence of the parasite is only discovered accidentally- when the carcass of a bird which has died from some other cause is being examined. In other cases the fowls are listless, inactive, with pale comb, and loss of flesh. Occasional- ly one dies without anyapparent cause. The acute cases may come on with - out premonitory symptoms. The affected birds are found quite ill, standing by them- selves, with neck retracted, wings d
The diseases of poultry (1899) The diseases of poultry diseasesofpoultr00salm Year: 1899 64 DISHASES OF POULTRY. air-sac mite show no symptoms of disease, and the ex- istence of the parasite is only discovered accidentally- when the carcass of a bird which has died from some other cause is being examined. In other cases the fowls are listless, inactive, with pale comb, and loss of flesh. Occasional- ly one dies without anyapparent cause. The acute cases may come on with - out premonitory symptoms. The affected birds are found quite ill, standing by them- selves, with neck retracted, wings drooped, and la- bored breathing. There may be rattling of mucus in the throat as in bronchitis, or paroxysms of coughing. Death may come suddenly from obstruction of the air-tubes with plugs of mucus, or in other cases the illness may be prolonged and the birds die of exhaustion. The mites are readily discovered on the walls of the air-sacs after the death of the bird. They are about one-fiftieth of an inch in length and, therefore, easily seen with the naked eye. They are often so numerous that the surfaces of the air-sacs appear as though dust- ed with a whitish or yellowish powder. By careful watching, the points of which this powder is composed are seen to move and may be made out as the indivi- Fiff. 13.—Cytodites Ntidux, female.
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