Abstract
The effect of a single dose of progesterone, administered to estradiol-primed chicks, on the activities in oviduct and liver of the first two enzymes of the porphyrin-heme biosynthetic pathway, δ-aminolevulinic acid synthetase (ALAS) and δ-aminolevulinic acid dehydratase (ALAD), has been investigated. The specific activity of ALAS in pooled glandular tissue of uterus and isthmus became significantly elevated at 18–24 hr after hormone injection. ALAD activity in uterine glandular tissue was not significantly increased after such treatment. Progesterone had no effect on hepatic activities of these two enzymes.
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