The gonadotropic-axis involvement in the course of the filial following response in the domestic fowl chick

Gvaryahu, G.; Snapir, N.; Robinzon, B.; Goodman, Gordon T.; Halawani, Mohamed E. El; Grimm, Veronika

doi:10.1016/0031-9384(86)90259-3

Cited by 7 publications

(2 citation statements)

References 19 publications

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“…Some cases of hormonal factors influencing the sensitive period of imprinting have been reported101112. A rise in the corticosterone levels in ducklings was assumed to define the end of the sensitive period.…”

Section: Discussionmentioning

confidence: 99%

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Thyroid hormone determines the start of the sensitive period of imprinting and primes later learning

et al. 2012

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Filial imprinting in precocial birds is the process of forming a social attachment during a sensitive or critical period, restricted to the first few days after hatching. Imprinting is considered to be part of early learning to aid the survival of juveniles by securing maternal care. Here we show that the thyroid hormone 3,5,3′-triiodothyronine (T3) determines the start of the sensitive period. Imprinting training in chicks causes rapid inflow of T3, converted from circulating plasma thyroxine by Dio2, type 2 iodothyronine deiodinase, in brain vascular endothelial cells. The T3 thus initiates and extends the sensitive period to last more than 1 week via non-genomic mechanisms and primes subsequent learning. Even in non-imprinted chicks whose sensitive period has ended, exogenous T3 enables imprinting. Our findings indicate that T3 determines the start of the sensitive period for imprinting and has a critical role in later learning.

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Section: Discussionmentioning

confidence: 99%

“…This learning behaviour, called filial imprinting, is restricted to a sensitive period5 that lasts only a few days in the case of chicks and ducklings. There are several theories concerning the control of the time course of this sensitive period6789, about which very little was known, including the existence of a determining factor101112.…”

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confidence: 99%