Abstract
Summary
The thyroid hormone secretion rate (TSR) of the same group of 36 male rats was estimated at 30 days and at 30-day intervals to 120 days. They declined from a mean of 1.40 μg/100 g bw to 1.03 μg at 120 days or 26%. A group of 118 male rats at 30 days of age had a mean TSR of 1.34 μg 100 g bw with a range from 0.75 μg to 2 μg /100 g bw. The TSR of a group of 29 females at 30 days of age was 1.47 μg/100 g bw and gradually declined to 0.87 μg at 240 days of age or 41%. It was shown that the TSR of both male and female rats decline with age but the rate of decline may vary in different groups of animals.
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