Open AccessEvaluation of thyroxine (T4) and progesterone-17-alpha-OH circadian rhythm in swine females (Sus scrofa domestica - Linnaeus, 1758)
Author(s) -
Gilson Hélio Toniollo,
Wilter Ricardo Russiano Vicente,
Cláudio Alvarenga de Oliveira,
José Cippola Neto
Publication year - 1998
Publication title -
brazilian journal of veterinary research and animal science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.187
H-Index - 17
eISSN - 1678-4456
pISSN - 1413-9596
DOI - 10.1590/s1413-95961998000400010
Subject(s) - circadian rhythm , biology , endocrinology , alpha (finance) , medicine , construct validity , nursing , patient satisfaction
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