Effects of ingested petroleum on plasma levels of ovarian steroid hormones in photostimulated mallard ducks.
D000818:Animals; D004372:Ducks / Q000097:blood*; D004967:Estrogens / Q000097:blood*; D005260:Female; D005506:Food Contamination; D010058:Oviposition / Q000187:drug effects*; D010578:Petroleum / Q000633:toxicity*; D010775:Photic Stimulation; D011374:Progesterone / Q000097:blood*
D004967:Estrogens; D010578:Petroleum; D011374:Progesterone