. Biggle poultry book;. Poultry. THE EGG. 17. Fig. 3. On the fifth or sixth da}- of iucu- bation, a strong, fertile egg will look like Figure 3. The air-sack is slightly enlarged and from a dark center fine red lines are seen to radiate. There is also a slight cloudiness about this dark spot or germ, and the germ can be seen to move slightly as the egg is revolved. It often happens that the germ begins to develop and dies before the sixth da}'. In this case the red lines are indistinct, or absent, and in their place is a dark circle enclosing the germ as appears in Figure 4. When the egg is re
. Biggle poultry book;. Poultry. THE EGG. 17. Fig. 3. On the fifth or sixth da}- of iucu- bation, a strong, fertile egg will look like Figure 3. The air-sack is slightly enlarged and from a dark center fine red lines are seen to radiate. There is also a slight cloudiness about this dark spot or germ, and the germ can be seen to move slightly as the egg is revolved. It often happens that the germ begins to develop and dies before the sixth da}'. In this case the red lines are indistinct, or absent, and in their place is a dark circle enclosing the germ as appears in Figure 4. When the egg is revolved this dead embryo floats aimlessly about in the surround- ing contents. All infertile eggs that were fresh when incubation began, will remain clear up to the sixth day, or even lon- ger, but a stale egg shows a cloudy spot in the center and a large air sack. When opened, the yolk sack is apt to break and the contents to run together, or, as we say, become "; All such eggs, as well as those that contain dead embryos, and all clear or infertile eggs should be removed at this first testing. A second testing of eggs should be made on the tenth da}-. By this time the air sack has still further en- larged and the growth of the embrj'O Fig. ^.. 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 Biggle, Jacob. [from old catalog]. Philadelphia, Wilmer Atkinson co.
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Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectpoultry, bookyear1895
