. Diseases of poultry; their etiology, diagnosis, treatment, and prevention. Poultry. External Parasites 207. closely resembles M. pallidum, is also sometimes found. These are active lice living on all parts of the body. They often crawl on to the hands when handling or plucking birds, and may sometimes be found in the nests. There are several other lice which some- times infest poultry. Each of these species is confined to a special region of the host. Although capable of crawling about, the lice of these species for the most part remain nearly stationary, often with their heads buried in the
. Diseases of poultry; their etiology, diagnosis, treatment, and prevention. Poultry. External Parasites 207. closely resembles M. pallidum, is also sometimes found. These are active lice living on all parts of the body. They often crawl on to the hands when handling or plucking birds, and may sometimes be found in the nests. There are several other lice which some- times infest poultry. Each of these species is confined to a special region of the host. Although capable of crawling about, the lice of these species for the most part remain nearly stationary, often with their heads buried in the skin and tlieir bodies erect. Two species, Lipeurus variabilis and Lipeu- rus heterographus, live among the barbs of the wing and tail feathers. Goniodes dis- similis is found under the wings and on the rump. The appearance of two of the species mentioned, viz., Lipeu- rus variabilis and Goni^ odes dissimilis, is show^n in Figs. 37 and 38 respectively. All true bird lice (Mallophaga) have biting, not piercing mouth parts. They live upon fragments of feathers, scales of the skin and other such debris. It is evident from the action of infested birds that these parasites cause con- siderable pain and itching. This must be particularly true when they are present in large numbers. Life-history of Lice. — All the lice breed fairly rapidly. The eggs or nits are laid upon the down feathers, as a rule; they are often beautifully sculptured objects, oval in form. In about 6 Fig. 37. — Lipeu- rus variabilis. A louse that infests poul- try. Much en- larged. (From Banks, after Denny.). 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, 1879-1940; Surface, Frank M. (Frank Macy), 1882- joint author; Curtis, Maynie R. (Maynie Rose), b. 1880, joint author. New York, The Macmillan Company
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectpoultry, bookyear1915
