| Local effect of the conceptus on uterine vascular perfusion during early pregnancy in heifers. | |
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MedLine Citation:
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PMID: 19920117 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Colour-Doppler ultrasonography was used to study the spatial relationship between vascular perfusion in the middle of each uterine horn and the reported location of the embryo proper and expanding conceptus using endometrial vascularity scores 1-4 (nil-maximal). Vascularity increased in both uterine horns between days 14 and 18 (day 0=ovulation) in nonpregnant heifers (n=6) but not in pregnant heifers (n=11). The increase was temporally associated with decreasing plasma progesterone and increasing oestradiol. In pregnant heifers, a transient increase in endometrial vascularity in the ipsilateral horn (horn with embryo) was not detected before day 18, despite a reported transient increase in blood flow in the ipsilateral uterine artery between days 13 and 17. Endometrial vascularity in the ipsilateral horn first increased (P<0.05) between days 18 and 20. Day 20 is the reported day of adhesiveness between chorion and uterus. An increase (P<0.05) in the contralateral horn between days 18 and 22 was slight, but a greater increase occurred after day 32. Day 32 is the reported day of entry of the allantochorion into the contralateral horn. By day 42, scores were similar between the two horns, and the allantochorion reportedly fills both horns. On days 42-60, at a time when placentomes apparently are limited to the ipsilateral horn, vascularity remained elevated in the ipsilateral horn but decreased in the contralateral horn. Results support the hypothesis that vascular perfusion in each uterine horn during early pregnancy is mediated by direct contact between conceptus and uterus. |
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Authors:
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L A Silva; O J Ginther |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2009-11-17 |
Journal Detail:
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Title: Reproduction (Cambridge, England) Volume: 139 ISSN: 1741-7899 ISO Abbreviation: Reproduction Publication Date: 2010 Feb |
Date Detail:
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Created Date: 2010-01-26 Completed Date: 2010-02-22 Revised Date: 2010-03-11 |
Medline Journal Info:
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Nlm Unique ID: 100966036 Medline TA: Reproduction Country: England |
Other Details:
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Languages: eng Pagination: 453-63 Citation Subset: IM |
Affiliation:
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Eutheria Foundation, Cross Plains, Wisconsin 53528, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animals Blood Flow Velocity Cattle Embryo Implantation* Endometrium / blood supply Estradiol / blood Female Gestational Age Neovascularization, Physiologic* Ovulation Pregnancy Progesterone / blood Regional Blood Flow* Ultrasonography, Doppler, Color Ultrasonography, Prenatal / methods Uterus / blood supply*, ultrasonography Vascular Resistance |
| Chemical | |
Reg. No./Substance:
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50-28-2/Estradiol; 57-83-0/Progesterone |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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