. Poultry diseases and their treatment. Poultry. 44 POULTRY DISEASES knows has not been reported in this country. It affects the body of both chickens and pigeons. The one on chickens is the Sarcoptes laevei va- riety goMince and the one on. pigeons is the Sar- coptes laevei variety columhcB. The ascarids parasitic for birds are placed un- der the following genera: sarcoptes, cytodites, trombidium and dermanyssus. Unlike the various genera of lice the scab parasites differ greatly in the effects which they produce and therefore a separate discussion of each one will be given. Scaly Legs—Scabie
. Poultry diseases and their treatment. Poultry. 44 POULTRY DISEASES knows has not been reported in this country. It affects the body of both chickens and pigeons. The one on chickens is the Sarcoptes laevei va- riety goMince and the one on. pigeons is the Sar- coptes laevei variety columhcB. The ascarids parasitic for birds are placed un- der the following genera: sarcoptes, cytodites, trombidium and dermanyssus. Unlike the various genera of lice the scab parasites differ greatly in the effects which they produce and therefore a separate discussion of each one will be given. Scaly Legs—Scabies of the Legs This condition is very common; it constitutes leg scabies, and is caused by a parasite called the Sarcoptes mutans variety gallincB. Sarcoptes Mutans Description.^This parasite is one of the same family of scab parasites that infest horses, cattle, hogs, sheep and cats. That particular branch of the family af- fecting chickens is distinguished by call- ing it "variety gallinae"; gallinse being a Latin word meaning "of the ; Owing to the small size of the parasile, it is often called a mite. Fig. 10 illustrates the parasite magnified 100 times; the actual size of the parasite is shown by the smalL dot in the square at the right side of the drawing. In the drawing it will be noted that the legs are short and strong and that its mouth parts are arranged for biting the skin. They sub- sist upon serum that exudes at the point of attack and forms scales or scabs (see Fig. 11). Life History.—The female lays her eggs under the scabs, where in about ten days they hatch, if conditions are favor- able. The larvae or young mites are provided with only three pairs of legs and are not provided with sexual organs. They pass through several molts and are finally developed into the adult stage, and at that time are provided with four pairs of legs, with genital organs and are sexually Fig, 10. Sarcoptes Mutans Variety Gallant A, Mouth parts
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