. Fig. 8.—Chicken affected with g-apes. the eggs and embryos are set free by the disintegra- tion of the worm. The eggs require warmth and moisture to hatch, and similar conditions are needed for the life of the embryos. These newly-hatched em- bryos may be at once taken up by birds, with contami- nated food or drink, and thus cause infection; or they may be taken into the digestive canal of earth worms, as has been shown by Walker, and be carried for some time bj^ such earth worms. It has been shown conclu- sively that earth worms from infected poultry runs will cause gapes if fed to chickens
. Fig. 8.—Chicken affected with g-apes. the eggs and embryos are set free by the disintegra- tion of the worm. The eggs require warmth and moisture to hatch, and similar conditions are needed for the life of the embryos. These newly-hatched em- bryos may be at once taken up by birds, with contami- nated food or drink, and thus cause infection; or they may be taken into the digestive canal of earth worms, as has been shown by Walker, and be carried for some time bj^ such earth worms. It has been shown conclu- sively that earth worms from infected poultry runs will cause gapes if fed to chickens. Whether or not the earth worm plays an important part in sheltering and protecting the embryos of the syngamus and in thus maintaining the infection upon certain premises is not definitel}^ known. Walker considers the earth worm a very important
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Photo credit: © The Bookworm Collection / Alamy / Afripics
License: Licensed
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectpoultry, bookyear1899
