ONTOGENY OF THE CIRCADIAN-RHYTHM OF CORTISOL IN SHEEP

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dc.contributor.authorPARRAGUEZ, VH
dc.contributor.authorVERGARA, M
dc.contributor.authorRIQUELME, R
dc.contributor.authorRAIMANN, R
dc.contributor.authorLLANOS, AJ
dc.contributor.authorSERONFERRE, M
dc.date.accessioned2025-01-23T19:23:55Z
dc.date.available2025-01-23T19:23:55Z
dc.date.issued1989
dc.description.abstractIn this work we investigated the ontogeny of the rhythm of plasma cortisol in sheep. Plasma cortisol was measured by radioimmunoassay in blood samples obtained every 1 or 2 h, for periods of 24 or 48 h, in 13 fetal sheep (124-140 days of gestation; 130.6 .+-. 1.5, mean .+-. SE) and in 23 newborn (5-39 days of age). To this end, indwelling polyvinyl catheters were implanted into the femoral artery and vein in all animals. The presence of rhythm was determined by Cosinor Analysis. Newborns were separated into four groups. Group 1, newborns younger than 15 days of age (7.9 .+-. 0.7 days), and Group 2, newborns older than 15 days of age (25.4 .+-. 2.3), were raised under nyctohemeral conditions (12L:12D). Group 3, newborns younger than 15 days of age (11.4 .+-. 0.9 days), and Group 4, newborns older than 15 days of age (22.0 .+-. 1.2 days), were raised under constant light conditions. A 24-h rhythm of plasma cortisol (F) was observed in newborns over 15 days of age under both nyctohemeral: F (ng/ml) = 16.1 .+-. 7.6 cos [15 (t-12.9)], (p = 0.01, n = 8) and constant llight conditions: F (ng/mL) = 17.1 + 3.9 cos [15 (t-7.9)], (p = 0.02, n = 5). No rhythm was observed in fetal sheep or in newborn sheep younger than 15 days of age under nyctohemeral or constant light conditions.
dc.fuente.origenWOS
dc.identifier.eissn1529-7268
dc.identifier.issn0006-3363
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/99284
dc.identifier.wosidWOS:A1989AM41900002
dc.issue.numero6
dc.language.isoen
dc.pagina.final1143
dc.pagina.inicio1137
dc.revistaBiology of reproduction
dc.rightsacceso restringido
dc.subject.ods03 Good Health and Well-being
dc.subject.odspa03 Salud y bienestar
dc.titleONTOGENY OF THE CIRCADIAN-RHYTHM OF CORTISOL IN SHEEP
dc.typeartículo
dc.volumen40
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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