OVUM TRANSPORT IN PREGNANT, PSEUDOPREGNANT, AND CYCLIC RATS AND ITS RELATIONSHIP TO ESTRADIOL AND PROGESTERONE BLOOD-LEVELS

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dc.contributor.authorFORCELLEDO, ML
dc.contributor.authorVERA, R
dc.contributor.authorCROXATTO, HB
dc.date.accessioned2025-01-23T19:44:17Z
dc.date.available2025-01-23T19:44:17Z
dc.date.issued1981
dc.description.abstractThe time of passage of ova from the oviduct to the uterus and the systemic plasma levels of estradiol [E2] and progesterone [P4] were investigated in pregnant and pseudopregnant rats, and in rats with regular 4-day cycles. The relationships between ovum transport rates and steroid levels in plasma in these 3 physiologic conditions were examined. The day following proestrus was designated day 1 in the 3 groups. The number and distribution of ova were similar in the 3 physiologic conditions during the first 3 days, but significant differences appeared thereafter. The major shift in the distribution of ova between oviduct and uterus occurred between days 3 and 4 in cycling rats and between days 4 and 5 in pregnant and pseudopregnant rats. The total number of ova recovered decreased significantly on day 4 in cycling rats, on day 5 in pseudopregnant rats, and remained unchanged in pregnant animals. Differences in plasma E2 levels did not reach statistical significance. P4 concentration in plasma was significantly higher in pseudopregnant than in pregnant rats on days 2 through 5, and it was significantly lower in cycling rats in comparison with the outer groups on days 3 and 4. The E2/P4 ratio differed between groups from day 1. The time of passage of ova from the oviduct to the uterus is subject to physiologic regulation in the rat; postovulatory changes in sex steroid levels in plasma may contribute to this regulation.
dc.fuente.origenWOS
dc.identifier.eissn1529-7268
dc.identifier.issn0006-3363
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/99999
dc.identifier.wosidWOS:A1981LR48300005
dc.issue.numero4
dc.language.isoen
dc.pagina.final765
dc.pagina.inicio760
dc.revistaBiology of reproduction
dc.rightsacceso restringido
dc.subject.ods03 Good Health and Well-being
dc.subject.odspa03 Salud y bienestar
dc.titleOVUM TRANSPORT IN PREGNANT, PSEUDOPREGNANT, AND CYCLIC RATS AND ITS RELATIONSHIP TO ESTRADIOL AND PROGESTERONE BLOOD-LEVELS
dc.typeartículo
dc.volumen24
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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