Abstract
1. 1. Feeding of thyroxine to larvae of the bivoltine silkworm. Bombyx mori L. resulted in increased pupal hemolymph protein and ecdysteroid levels, increased yolk deposition and accelerated oocyte maturation. 2. 2. Due to early yolk deposition, mature oocytes were more numerous than vitellogenic oocytes in the ovarian tubules of thyroxine-treated animals scored on pupal day 8. 3. 3. Oocyte size was significantly higher following the thyroxine treatment. 4. 4. Pupal-adult eclosion was accelerated. 5. 5. Hemolymph and oocyte ecdysteroid profiles were quantitatively and qualitatively altered. 6. 6. The data suggest that the vertebrate hormone thyroxine effects changes in insect development and maturation through changes in ecdysteroid patterns.
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