Ockleford E M, Davison T F, Vince M A
Comp Biochem Physiol A Comp Physiol. 1983;75(2):139-40. doi: 10.1016/0300-9629(83)90059-2.
Plasma concentrations of thyroxine (T4) and triiodothyronine (T3) were measured at the onset of breathing, clicking and hatching in unstimulated chick embryos. There was a progressive increase in plasma T3 concentration from the onset of breathing (482 hr of incubation) to hatching (496 hr). Plasma T4 concentration did not change significantly between the start of breathing and clicking (494 hr) but decreased between the onset of clicking and hatching. Embryos stimulated with artificial clicks hatched 19 hr before their unstimulated counterparts but their plasma concentrations of T3 and T4 did not differ at hatching from those of unstimulated embryos; however, the plasma T3 concentration, but not T4, at hatching was higher than in unstimulated embryos incubated for a similar length of time, i.e. to the onset of breathing.
在未受刺激的鸡胚胎呼吸开始、发出啄壳声和孵化时，测量了血浆甲状腺素（T4）和三碘甲状腺原氨酸（T3）的浓度。从呼吸开始（孵化482小时）到孵化（496小时），血浆T3浓度逐渐升高。在呼吸开始到发出啄壳声（494小时）之间，血浆T4浓度没有显著变化，但在发出啄壳声到孵化之间有所下降。用人工啄壳声刺激的胚胎比未受刺激的胚胎提前19小时孵化，但其孵化时血浆T3和T4浓度与未受刺激的胚胎并无差异；然而，孵化时血浆T3浓度高于在相同孵化时长（即到呼吸开始）的未受刺激胚胎，而T4浓度则不然。
