. The principles and practice of veterinary surgery . Fis. 130.—Symbiotes bovis.—(Geelaoh.) SCABIES. 717 SCAB IN SHEEP. Three forms of scab are described, viz., the sarcoptic, dermato-dectic, and symbiotic. The dermatodectic or psoroptic is thecommon form known in this country; it is intensely contagious. Fis. 131.—Dermatodectea ovis.—(Gerlaoh. ) and spreads with great rapidity, the parasite which causes it 718 DISEASES OF THE SKIN. propagating most rapidly, as the following table furnished byGerlach will show:— G-eneration. Days. Females Born. Males Bom 1st. . 15 . 10 . 5 2d. . 30 . 100 . 50
. The principles and practice of veterinary surgery . Fis. 130.—Symbiotes bovis.—(Geelaoh.) SCABIES. 717 SCAB IN SHEEP. Three forms of scab are described, viz., the sarcoptic, dermato-dectic, and symbiotic. The dermatodectic or psoroptic is thecommon form known in this country; it is intensely contagious. Fis. 131.—Dermatodectea ovis.—(Gerlaoh. ) and spreads with great rapidity, the parasite which causes it 718 DISEASES OF THE SKIN. propagating most rapidly, as the following table furnished byGerlach will show:— G-eneration. Days. Females Born. Males Bom 1st. . 15 . 10 . 5 2d. . 30 . 100 . 50 3d. . 45 . 1,000 . 500 ith. . 60 . 10,000 . 5,000 5th. . 75 . 100,000 . 50,000 6tli. . 90 . . 1,000,000 . 500,000 Its first symptom is itchiness, attempts to allay which soongive the animal a ragged appearance, tufts of wool being puUedout, leaving white patches. If the animal be caught and the bareparts examined, a slightly prominent pimple of a yellowish redcolour will be observed. Upon the surface of this pimple a smallblister or vesicle soon forms, its contained serosity, being dis-charged, forms the crust or scab, and at a little distance theparasite may be discovered amongst the wool. If the barepatches be gently rubbed or scratched, the sheep
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectveterin, bookyear1904
