Background and
Objective:
Studies have shown that alteration in photoperiod influences secretion of many
hormones. The aim of this study was to investigate the effect of different
periods of darkness on serum level of T3, T4 and TSH in male rats. Materials and
Methods:
In this experimental study, 30 male Wistar rats were randomly divided into
control group (exposed to 12 h light-12 ...
