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Science: Topic #9
Embryology
Term | Definition |
---|---|
embryo | a fertilized egg at any stage of growth before hatching |
shell | hard protective outer covering of the eggs of birds |
air cell | pocket of air between the cell’s membranes |
yolk | round yellow portion of a bird’s egg, that contains protein and fats that provide nourishment for the developing young |
chalazae | strand holding egg yolk in place |
albumen | white of an egg that surrounds the yolk of an egg, and provides nutrition for the embryo |
shell membrane | transparent protein that protects against bacteria that try to infect the chick |
candling | provides light to observe the contents of the shell |
egg tooth | the temporary horny cap on the chick’s upper beak that is used for breaking through the shell |
hatch | coming out of an egg |
brooder box | heated area for raising young birds |
incubator | device in which the temperature is kept at a constant level so that eggs can be hatched |