Bird early development
Avian embryology: Chicken development can be used to model the development of birds and repltiles. What is commonly reffered as the egg of a chicken is, in the reality, the true egg, plus a variety of membranes that protect the egg. The yellow portion of the chicken egg is the single cell produced in the chicken ovary. This egg is released into the oviduct , where fertilization may occur, following fertilization and fluids collect around the egg. A vitelline membrane covers the surface of the true egg. The “white” consists of water and a protein called albumen. This watery environment protects the egg from mechanical damage and drying. Albumen is a source of nutrients(in addition of the yolk of the egg)and is eventually consumed during development .two denser strands of albumen (called chalazas)attach to the inside of the shell and to the egg, and suspend the egg in the Center of watery albumen. The shell is made of calcium carbonate impregnated with protein. Thousands of tiny por...