. Diseases of poultry; their etiology, diagnosis, treatment, and prevention. Poultry. External Parasites 225 to be composed of numerous mites and their debris. The irritation of the mites often causes the birds to pull their own feathers. Birds affected often pull each others' feathers. Some of the so-called feather eating is due to the presence of this parasite, but fowls sometimes pull each others' feathers when the parasite is not present. Salmon says this disease does not affect the general health of the bird and does not appear to disturb gain in flesh or egg pro- duction, but Theobald sa
. Diseases of poultry; their etiology, diagnosis, treatment, and prevention. Poultry. External Parasites 225 to be composed of numerous mites and their debris. The irritation of the mites often causes the birds to pull their own feathers. Birds affected often pull each others' feathers. Some of the so-called feather eating is due to the presence of this parasite, but fowls sometimes pull each others' feathers when the parasite is not present. Salmon says this disease does not affect the general health of the bird and does not appear to disturb gain in flesh or egg pro- duction, but Theobald says that the disease checks egg lay- ing in hens and affected cocks become emaci- ated and some- times die. Etiology.—The mite Sarcoptes las vis which causes this dis- ease is smaller than the one which causes scaly leg. They live at the base of the feathers in the epidermal debris referred to above. A flock becomes infested by the intro- duction of one or more birds carrying the mites. The mites are spread from bird to bird by the male in copulation. The distribution is often very rapid so that the whole flock is soon affected. Treatment. — The disease should be prevented by taking care not to introduce infested birds. If it appears, all affected birds should at once be isolated. The mites yield easily to treatment. The infested areas may be rubbed with some Q. Fig. 46. — Egg containing female Sarcoptes Icevis var. gallince. (After Theobald.). 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 Pearl, Raymond; Surface, Frank Macy, 1882- joint author; Curtis, Maynie Rose, 1880- joint author. New York, The Macmillan Company
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectpoultry, bookyear1915
