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  • Title: Effect of sex and age on serum aldosterone and thyroid hormones in the laboratory rat.
    Author: Tang F.
    Journal: Horm Metab Res; 1985 Oct; 17(10):507-9. PubMed ID: 4065813.
    Abstract:
    Serum levels of aldosterone, tri-iodo thyronine (T3) and thyroxine (T4) were measured in male and female rats aged 3 months, 12 months, and 18 months. Female rats were found to have higher aldosterone and T3 levels, and lower T4 level than the male. No age-related change was observed in serum aldosterone in either sex. In contrast, serum T4 were found to decrease with age in both sexes while serum T3 showed an age-associated diminution in the male only. Serum testosterone was also measured in the male rats and was found to decline with age.
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