630 5 archive 73 disk0/00/00/06/30 2007-01-19 2008-07-18 09:46:46 2008-07-16 15:49:30 article show s.m.jones@utas.edu.au Cartledge VA Gartrell BD Jones SM S.M.Jones@utas.edu.au pub 060603 060604 270604 270603 restricted Adrenal; Captivity; Corticosterone; Immune system; Leucocytes; Lizard; Progesterone; Stress; Viviparous Definitive version available at http://www.elsevier.com/locate/cbpa 18/1 SvA: Comparative Biochemistry and Physiology - Part A -Elsevier Science - pub pdf not allowed - have restricted access; DOI, URL and ISSN added. (15/4 SvA) fixed initials, funny chars in refs. This study investigates the relationships between plasma corticosterone concentrations and white cell counts in captive females of the viviparous lizard Egernia whitii during two phases of the reproductive cycle. Gestating and postpartum females were captured in the field and held in the laboratory for 4 weeks. Plasma corticosterone and progesterone concentrations and white blood cell counts were examined in blood samples taken at capture and after 24 h, 1 week, and 4 weeks in captivity. At 24 h after capture, plasma corticosterone concentrations in both groups had increased significantly compared with initial values but then returned to initial concentrations after 1 week in captivity and remained low in the 4 week samples. Plasma progesterone concentrations remained elevated in the gestating females until the week 4 sample, just prior to parturition. The hormone data suggest that capture and captivity did not represent a significant long-term stressor to these animals. The increase in plasma corticosterone concentration was associated with heterophilia in the differential leucocyte count in both groups of females. 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