title: [Effect of the length of egg storage on duration of incubation and serum thyroid hormone levels in the chick embryo].
abstract: After storage at 12 degrees C and 90 to 95 p. 100 humidity, for periods of 1, 5, 8, 11 and 14 days, Rhode Island Red eggs were incubated at 37.5 degrees C and 60 p. 100 humidity. Whatever the total duration of incubation within the experimental conditions, maximal serum levels of triiodothyronine (T3) and thyroxine (T4) were obtained the day of pipping. Embryos having perforated the air-space membrane the day before pipping showed elevated serum T3, but not T4, levels as compared to embryos without a perforation. The lower serum T3 levels, obtained at pipping, after longer periods of preincubation storage are discussed in relation to other experiments on perinatal changes in serum iodo-hormones.
mesh_terms: D000818:Animals; D002642:Chick Embryo / Q000502:physiology*; D003080:Cold Temperature; D013974:Thyroxine / Q000097:blood*; D013997:Time Factors; D014284:Triiodothyronine / Q000097:blood*
chemical_list: D014284:Triiodothyronine; D013974:Thyroxine
vernacular_title: Influence du stockage des oeufs à couver sur la durée d'incubation et le taux sérique d'hormones thyroïdiennes chez l'embryon de poulet.