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[Salinan]Disalin!
DEVELOPMENT OF EMBRYO FUNCTIONAL SYSTEMThe development of organs start early in chick embryonic development, and all functional organs are well developed before hatch. Initial development of the chick embryo is rapid: by h 44 of incubation, the heart is beating and vascular systems are linked. By the end of the third day of incubation, limb buds for the wings and legs are visible and the auditory pit is established. Formation of reproductive organs, differentiation of sex, and beginning of voluntary movements take place on d 5 and 6. By d 7, the heart is completely enclosed in the thoracic cavity and feather buds are forming. By d 10, the beak hardens and toes are fully formed (stage 36 of HH when the length of beak and third toe are started to use as an indicator for embryonic staging). On embryonic d 14, the embryo is moving into position for hatching and turns its head toward the large end of egg. Rapid-eye-movement (REM) is detected at d 15, which is related to high levels of forebrain activation in the chick embryo and signals the time the embryo enters a growth phase before hatching (Mellor and Diesch, 2007; Mellor, 2010). Furthermore, it is shown that chicken maternal calls at this stage can stimulate the embryonic brain to a waking-like state in advance of hatch (Balaban et al., 2012)
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