title: Physical influences on embryo development.
abstract: There is a critical period between 3 and 7 days of incubation when the absence of turning in eggs of the domestic fowl leads to increased mortality and decreased embryo growth. This critical period coincides with the time of subembryonic fluid formation, and it is suggested that the absence of turning leads to the presence of unstirred layer effects in fluid secretion. This fluid deficiency persists throughout the subsequent development of the embryo. Experiments on shell-less culture systems support this interpretation in preference to other explanations of embryo death in unturned eggs, which usually refer to chorion adhesion to shell membranes.
mesh_terms: D000818:Animals; D002642:Chick Embryo / Q000254:growth & development*; D009997:Osmotic Pressure; D011188:Potassium / Q000032:analysis; D011506:Proteins / Q000032:analysis; D012964:Sodium / Q000032:analysis; D013997:Time Factors
chemical_list: D011506:Proteins; D012964:Sodium; D011188:Potassium