title: Changes in blood progesterone concentration during pregnancy in the lizard Tiliqua (Trachydosaurus) rugosa.
abstract: Progesterone concentrations during pregnancy were measured in the plasma of the viviparous lizard (scincid) Tiliqua (Trachydosaurus) rugosa, using a radioimmunoassay specific for progesterone. The length of gestation in this Australian lizard was 140-170 days. The average number of young was 2.8 and the mean neonatal weight 58 g (maternal body weight 500-700 g). The mean concentration of progesterone was greatest (7.2 nmol/l) during the second trimester of pregnancy; mean values during the first and third trimesters, and in non-pregnant females, were 1.8, 0.9 and 0.2 nmol/l respectively.
mesh_terms: D000818:Animals; D005260:Female; D008116:Lizards / Q000502:physiology*; D011374:Progesterone / Q000097:blood*; D011863:Radioimmunoassay / Q000379:methods; D012098:Reproduction; D013997:Time Factors
chemical_list: D011374:Progesterone