Abstract
1. 1. Comparative study on primary and secondary stimulation of hepatic δ-aminolaevulinic acid dehydratase (ALAD) (EC 4.2.1.24) was carried out after oestradiol-17β and/or testosterone administration in immature female chicken. 2. 2. When 2 mg/day oestradiol was administered to birds for 15 days successively, hepatic total ALAD activity increased to 170% by day 15 of primary stimulation, whereas a more rapid increased rate was observed within day 3 of secondary stimulation and thereafter the hepatic ALAD activity maintained the same high level from day 3 to day 15. 3. 3. Testosterone (2 mg/day) alone decreased hepatic total ALAD activity during both primary and secondary stimulation. 4. 4. When testosterone (0.25–10 mg/day) was injected into birds in combination with 2 mg oestradiol for 15 days during primary and secondary stimulation, only an antagonistic effect of testosterone on oestradiol-stimulated total ALAD activity in liver was observed independently of the testosterone amount administered. However, the extent of suppression of hepatic ALAD activity by testosterone during primary stimulation was markedly different from that of secondary stimulation.
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