. Diseases of poultry; their etiology, diagnosis, treatment, and prevention. Poultry. Internal Parasites 135 breaks are usually confined to comparatively small areas and are perhaps more common in the southern states. Etiology. — The tape worms of poultry, like those which infest man and the domestic animals, are long, flat, segmented worms (Fig. 19). The anterior end of the animal possesses a number of hooks or suckers by which it attaches itself to the walls of the intestine. Back of this head the entire animal consists of a long series of segments or proglottids. The segments near- est the
. Diseases of poultry; their etiology, diagnosis, treatment, and prevention. Poultry. Internal Parasites 135 breaks are usually confined to comparatively small areas and are perhaps more common in the southern states. Etiology. — The tape worms of poultry, like those which infest man and the domestic animals, are long, flat, segmented worms (Fig. 19). The anterior end of the animal possesses a number of hooks or suckers by which it attaches itself to the walls of the intestine. Back of this head the entire animal consists of a long series of segments or proglottids. The segments near- est the head are the smallest and it is at this region that new segments are, constantly being formed. The farther from the head they get the larger the seg- ments become. Towards the pos- terior end of the worm the seg- ments develop sexual organs and later become filled with eggs. As soon as the eggs are fertilized and mature the segment contain- ing them drops off and passes to the exterior with the feces of the host. Each segment of this kind contains thousands of eggs. If these eggs are to develop farther they must be swallowed by some intermediate host (as a worm, snail or insect). The egg then hatches into a 6-hooked embryo which bores its way from the intestine into the bodv cavitv of the inter-. FiG. 19. —• Drepanidotcenia in- fundibuliformis, a tape worm of the fowl. (After Stiles.). 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
