Abstract
The average serum concentration of T-3 and T-4 ranged from 1.29 ng/ml to 1.55 ng/ml and from 61.73 ng/ml to 76.04 ng/ml, respectively. The mean relation of T-4/T-3 was 50.6%. The concentration of free T-3 and free T4 ranged from 2.4 pg/ml to 3.5 pg/ml and from 5.2 ng/dl to 6.7 ng/dl, respectively. The differences between the average level of the males were significant. The thyroid hormone concentrations changed seasonally, with the highest concentration during the winter months and the lowest during the summer time. The concentrations were positive correlated with the position in range order. The serum T-3 and T-4 showed a significant positive correlation with the number of spermatozoa. Negative correlations were calculated for T-3, T-4 and fT(4) with the average ambient temperature, the maximum and minimum temperature and the hours of sunshine per day. Free T-3 was negatively correlated with semen volume (p<0.01).