Study on the effects of estradiol-17β, estrone, catechol estrogens, [ d-ala 6]-luteinizing hormone releasing hormone and human chorionic gonadotropin on serum levels of lipids and vitellogenin in the immature duckling ( Anas platyrhynchos)

Abstract

1. 1. The effects of administration of estradiol-17β (E 2), estrone (E 1), catechol estrogens, [ d-Ala 6]-luteinizing hormone releasing hormone (LHRH) and human chorionic gonadotropin (HCG) on serum levels of vitellogenin and lipids were examined in immature ducklings. 2. 2. E 2 brought about an elevation in serum levels of total lipid, triglyceride, cholesterol and vitellogenin. 3. 3. Treatment with both LHRH and E 2 resulted in an increase in serum levels of total lipid, triglyceride, cholesterol and vitellogenin. 4. 4. Treatment with LHRH alone, HCG, E 1 or catechol estrogen failed to exert any effect on serum lipid or vitellogenin level. 5. 5. The results indicate that, of the various hormones examined including estrogens, LHRH and HCG, only E 2 was able to affect serum lipid and vitellogenin concentrations in the duckling.