Evaluation of thyroxine (T4) and progesterone-17-alpha-OH circadian rhythm in swine females (Sus scrofa domestica - Linnaeus, 1758)

Authors

  • Gilson Hélio Toniollo Universidade Estadual Paulista, Faculdade de Ciências Agrárias e Veterinárias, Departamento de Reprodução Animal, Jaboticabal, SP
  • Wilter Ricardo Russiano Vicente Universidade Estadual Paulista, Faculdade de Ciências Agrárias e Veterinárias, Departamento de Reprodução Animal, Jaboticabal, SP
  • Claudio Alvarenga de Oliveira Universidade de São Paulo, Faculdade de Medicina Veterinária, Departamento de Reprodução Animal, São Paulo, SP
  • José Cippola Neto Universidade de São Paulo, Instituto de Ciências Biomédicas, Biomédicas I, São Paulo, SP

DOI:

https://doi.org/10.1590/S1413-95961998000400010

Keywords:

Circadian rhythm, Hormone, Swine

Abstract

Aiming at the evaluation of the occurrence of thyroxine and progesterone-17-alpha-OH circadian rhythm, 4 adult crossbred swine females (non-pregnant and showing no estrous signs) were studied, reared and kept under a industrial management system. Hormone determinations were assessed by solid phase radioimmunoassay (RIA)ª. Thyroxine serum analysis showed the highest concentrations around 3:00 PM and decreased until reaching the lowest values at the 0:00 to 4:00 AM interval. Regarding progesterone-17-alpha-OH, the highest concentrations were observed at 3:00 AM, showing a progressive decrease along the day until reaching lower values at the 12:00 to 3:00 PM interval.

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Published

1998-01-01

Issue

Vol. 35 No. 4 (1998)

Section

VETERINARY MEDICINE

License

The journal content is authorized under the Creative Commons  BY-NC-SA  license (summary of the license: https://creativecommons.org/licenses/by-nc-sa/4.0 | full text of the license: https://creativecommons.org/licenses/by-nc-sa/4.0/legalcode) 

How to Cite

1.
Toniollo GH, Vicente WRR, Oliveira CA de, Cippola Neto J. Evaluation of thyroxine (T4) and progesterone-17-alpha-OH circadian rhythm in swine females (Sus scrofa domestica - Linnaeus, 1758). Braz. J. Vet. Res. Anim. Sci. [Internet]. 1998 Jan. 1 [cited 2025 Mar. 20];35(4):195-7. Available from: https://www.revistas.usp.br/bjvras/article/view/5701