Oral thyroxine administration mimics photoperiodically induced gonadal growth in Japanese quail

Shinobu Yasuo, Shizufumi Ebihara, Takashi Yoshimura

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Most temperate-zone animals are seasonal breeders. In a previous study, it was found that light-induced hormone conversion of thyroxine (T4) prohormone to active 3,5,3′-triiodothyronine (T3) in the mediobasal hypothalamus regulates photoperiodic response of gonads in Japanese quail. Here the effect of T4 or T3, administered in drinking water, on testicular growth in the Japanese quail kept under short days is shown. Testicular length was significantly increased in birds given T 4 at doses of 4, 8 and 10 mg/L, while any dose of T3 had little effect on testicular growth. High doses (8 and 10 mg/L) of T4 and T3 resulted in high mortality and/or reduction of bodyweight. Among all of the treatment, 4 mg/L of T4 was the most effective on photoperiodic testicular growth, which caused little reduction in bodyweight. These data provide a new conventional method for promoting gonadal growth under short days.

Original languageEnglish
Pages (from-to)407-410
Number of pages4
JournalAnimal Science Journal
Volume75
Issue number5
DOIs
Publication statusPublished - Oct 1 2004
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Agricultural and Biological Sciences(all)

Fingerprint Dive into the research topics of 'Oral thyroxine administration mimics photoperiodically induced gonadal growth in Japanese quail'. Together they form a unique fingerprint.

Cite this