. Swine practice . Swine. 250 SWINE PRACTICE three days moult into nymplia?. The nymphaa have four pairs of legs, but they have no sexual organs. In two or three days the nymphie moult and the sexually matured males and females come forth. The sexually matured parasites mate, and in about three to five days the ovigerous female is found in the gallery in the skin, ovulating. Thus the entire life cycle does not exceed twenty-five days, and under the most favorable conditions may be accomplished in fifteen days. From each ovulation about five males and ten females are produced, and if the reprod
. Swine practice . Swine. 250 SWINE PRACTICE three days moult into nymplia?. The nymphaa have four pairs of legs, but they have no sexual organs. In two or three days the nymphie moult and the sexually matured males and females come forth. The sexually matured parasites mate, and in about three to five days the ovigerous female is found in the gallery in the skin, ovulating. Thus the entire life cycle does not exceed twenty-five days, and under the most favorable conditions may be accomplished in fifteen days. From each ovulation about five males and ten females are produced, and if the reproduction were to go on unhindered for three months, the total. Fig. 58. Sarccptic mange mite. Female. Magnified 100 times. (Farmers' Bulletin 1085, Dept. Agri.) reproduction would approximate 1,500,000 parasites. The adults are mere specks, barely visible to the unaided eye. Swine become infested from infested premises or from infested swine. Premises may remain infested for six months or even longer. Lesions.—The lesions produced by the Sarcoptes are practically con- fined to the skin; however, secondary lesions, as emaciation, may arise. The parasite obtains tissue juice by pricking the skin with its stylet. The stylet injury produces erythema, succeeded by the formation of vesicles, which rupture, the vesicular fluid drying and forming a scab beneath which the parasites are found. Scabs are of varying thick- ness, and accumulate wherever the parasites are found unkss the. 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 Kinsley, Albert Thomas, 1877-. Chicago : American Veterinary Pub. Co.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectswine, bookyear1921
