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

How to Cite

Toniollo, G. H., Vicente, W. R. R., Oliveira, C. A. de, & Cippola Neto, J. (1998). Evaluation of thyroxine (T4) and progesterone-17-alpha-OH circadian rhythm in swine females (Sus scrofa domestica - Linnaeus, 1758). Brazilian Journal of Veterinary Research and Animal Science, 35(4), 195-197. https://doi.org/10.1590/S1413-95961998000400010

Issue

Section

VETERINARY MEDICINE

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