Abstract
OELLACHER (1872) reported the presence of vacuoles in the germinal area of incubated and unincubated infertile chicken eggs, observing that such vacuoles were absent in fertile eggs. According to Lécaillon (1910) segmentation in the infertile unincubated avian germ disc is restricted to its central portion and does not progress as far as in the fertile, unincubated egg. Furthermore, he found that incubating infertile eggs, or keeping them at room temperature for a time results in a rapid breakdown of the segmentation area.The vacuoles are characteristic not only of the germinal area of chicken eggs, but also those of the duck (Chappelier, 1912) and turkey (Kosin, 1951). Kosin (1944) observed that the presence of a varying number of large and small vacuoles both along the periphery and in the center of the blastodisc of unincubated chicken eggs in extreme cases gives its surface a reticular appearance. The normal blastoderm in …
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