| Porcine LH levels during the estrous cycle, gestation, parturition and early lactation. | |
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MedLine Citation:
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PMID: 7107535 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Thirty-five sows were used in a study of plasma luteinizing hormone (LH) concentrations during the estrous cycle, including first and second estrus postweaning, during gestation, at parturition and during the first 5 d of lactation. After cannulation of the anterior vena cava via the cephalic vein, blood samples were collected four times daily for 2 d before estrus, during estrus and for 3 d after estrus and once daily at 1100 h throughout the rest of the estrous cycle. One sample was collected from each sow on alternate days (1100 h) during the gestation period. Four daily samples were obtained on d 60 through 68 of gestation and for 5 d after parturition. Preovulatory surges of LH occurred 8 to 32 h before standing estrus in four of seven sows during first estrus and in three of seven sows during second estrus. The mean preovulatory LH surge during the first estrus postweaning (3.00 +/- .46 ng/ml) was lower than that during second estrus (4.24 +/- .60 ng/ml). Throughout the first 12 d of gestation, LH concentrations were relatively high and variable, ranging from 1.2 to 2 ng/ml. They then decreased to a range of .42 to .62 ng/ml after d 24. Similar LH concentrations were noted throughout the remainder of gestation except for some slight fluctuations. Higher concentrations (P less than .05) were noted with evening collections (1900 h, 1:17 +/- .09 ng/ml) than in daytime collections (0700 h, .64 +/- .08: 1100 h, .61 +/- .06; 1500 h, .72 +/- .06 ng/ml) during d 60 to 68 of gestation. Low plasma concentrations of LH (.3 to .5 ng/ml) were observed for the 5 d before and during parturition. After parturition, considerable variation of LH occurred, with rising concentrations observed on d 5 postpartum. Results of this study illustrate the occurrence of LH surges before behavioral estrus with increased plasma LH during implantation. |
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Authors:
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A Ziecik; H Krzymowska; J E Tilton |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal of animal science Volume: 54 ISSN: 0021-8812 ISO Abbreviation: J. Anim. Sci. Publication Date: 1982 Jun |
Date Detail:
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Created Date: 1982-10-21 Completed Date: 1982-10-21 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 8003002 Medline TA: J Anim Sci Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 1221-6 Citation Subset: IM |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Estrus* Female Humans Infant, Newborn Labor, Obstetric* Lactation* Luteinizing Hormone / blood* Pregnancy Pregnancy, Animal* Swine / blood*, physiology |
| Chemical | |
Reg. No./Substance:
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9002-67-9/Luteinizing Hormone |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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