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  • embryo
  • As uricoletic animals, chickens produce cleidoic eggs, which are self-contained bacteria-resistant biological packages for extra-uterine development of the chick embryo. (biomedcentral.com)
  • The hen manufactures a cleidoic egg [ 1 ], which is a completely self-sufficient and aseptic biological package for the extra-uterine development of the avian embryo. (biomedcentral.com)
  • FOOD
  • Furthermore, the chicken and egg have been an important basic food for humans worldwide for millennia. (biomedcentral.com)
  • contain
  • This adaptation implies that the egg must contain all components required for the complete extra-uterine development of a fertilized ovum into a viable chick in 21 days. (biomedcentral.com)