| Increase in progesterone and luteal blood flow without a luteolytic response after prostaglandin F(2α) treatment in early luteal-phase heifers. | |
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MedLine Citation:
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PMID: 21388756 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Acute changes in circulating progesterone concentration and luteal blood flow in heifers after a conventional dose of prostaglandin F(2α) (PGF; 25mg dinoprost, i.m.) were compared between the early luteal phase (Day 3) and midluteal phase (Day 10; Day 0=ovulation), using four groups (Day-3 control, Day-3 PGF, Day-10 control, and Day-10 PGF; n=6 heifers/group). Blood samples were collected at 0, 2, 5, 10, 15, 30, 60, and 120min (0min=treatment). Percentage of luteal area with color-Doppler blood-flow signals was estimated at 0, 10, and 30min. In the Day-3 and Day-10 PGF groups, progesterone increased to a peak at 15min. In the Day-3 PGF group, progesterone decreased to the pretreatment concentration by 60min but did not decrease to below the pretreatment concentration during the 2-h experimental period. In the Day-10 PGF group, progesterone decreased to below pretreatment concentration by 30min, indicating a luteolytic response. In the Day-3 and Day-10 PGF groups, luteal blood flow increased within 10min and remained elevated until the last examination at 30min. The absence of a decrease in progesterone to below pretreatment concentrations in the Day-3 PGF group indicated that luteolysis does not necessarily follow a transient increase in progesterone and a concomitant increase in luteal blood flow. The immediate transient increase in progesterone and an increase in luteal blood flow without a subsequent decrease in progesterone to below pretreatment concentrations after PGF treatment in early luteal-phase heifers are novel findings. |
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Authors:
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H K Shrestha; O J Ginther |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-2-13 |
Journal Detail:
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Title: Animal reproduction science Volume: - ISSN: 1873-2232 ISO Abbreviation: - Publication Date: 2011 Feb |
Date Detail:
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Created Date: 2011-3-10 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 7807205 Medline TA: Anim Reprod Sci Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
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Copyright © 2011 Elsevier B.V. All rights reserved. |
Affiliation:
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Eutheria Foundation, Cross Plains, WI 53528, USA. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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