QuailCoturnixColinusChick EmbryoAgingChimeraBird DiseasesChickensOviductsFeathersOvomucinEmbryo, NonmammalianCognition DisordersDucksBirdsAvian ProteinsTime FactorsGalliformesOncogene Protein p55(v-myc)BlastodermEgg ShellNeural CrestCloacaAvian Sarcoma VirusesSpecies SpecificityEgg ProteinsLongitudinal StudiesOvipositionAlpharetrovirusPigmentationAvian leukosis virusInfluenza in BirdsEggsMesodermNeuropsychological TestsMolecular Sequence Data