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egg
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egg

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Section through a fertilized bird egg. Inside a bird's egg is a complex structure of liquids and membranes designed to meet the needs of the growing embryo. The yolk, which is rich in fat, is gradually absorbed by the embryo. The white of the egg provides protein and water. The chalaza is a twisted band of protein which holds the yolk in place and acts as a shock absorber. The airspace allows gases to be exchanged through the shell. The allantois contains many blood vessels which carry gases between the embryo and the outside.

In animals, the ovum, or female gamete (reproductive cell).

After fertilization by a sperm cell, it begins to divide to form an embryo. Eggs may be deposited by the female (ovipary) or they may develop within her body (vivipary and ovovivipary). In the oviparous reptiles and birds, the egg is protected by a shell, and well supplied with nutrients in the form of yolk.



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? Mentioned in ? References in periodicals archive
 
Niblack says yield sacrifice is dependent upon how many nematodes are present-usually determined by a test that establishes an egg count.
Nematodes Get Nasty by Henderson, Pam / Farm Journal
That explains the wasps' reduced egg counts, says Hunter.
Virgin birth infections shift wasp targets by Milius, S. / Science News
Because of the skewed distribution of egg counts in the infected population, the effects of treatment on average intensity of infection were assessed by determining the change in geometric mean egg count between examinations.
Evidence Against Rapid Emergence of Praziquantel Resistance in ... by Ouma, John H. / Emerging Infectious Diseases
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