| Lack of effect of 10 kV/m 60 Hz electric field exposure on pregnant dairy heifer hormones. | |
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MedLine Citation:
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PMID: 15114640 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Sixteen pregnant Holstein heifers weighing 521 +/- 46 kg, at 3.3 +/- 0.7 months of gestation and 2.2 +/- 2.0 months of age were confined to wooden metabolism cages and were exposed to a vertical electric field (EF) of 10.0 +/- 0.4 kV/m and an artificial light cycle of 12 h light-12 h dark. The heifers were divided into two replicates of eight each. Each replicate was divided into two groups of four animals each, one group becoming the non-exposed and the second, the EF exposed group. The exposed group were housed in metabolism cages in an area where EF were generated, and the non-exposed group, in metabolism cages located in the adjacent area where the EF was less than 2% of that present in the exposed area. The test animals were subject to the different treatments for 4 weeks continuously. After 4 weeks, the animals switched treatment, the exposed group becoming the non-exposed group and vice-versa. Then the treatment continued for 4 more weeks. Catheters were inserted into the jugular vein of the animals, and blood samples were collected on twice a week to estimate the serum concentration of progesterone (P4), melatonin (MLT), prolactin (PRL), and insulin-like growth factor-1 (IGF-1). Feed consumption was measured daily and feed samples were collected twice a week. The results indicated that exposure of dairy cattle to EF similar to those encountered directly underneath a 735 kV high tension electrical power line carrying a maximum load of current, cannot be associated with any variation in the experimental variables mentioned above. An exception to this, is the variation in MLT, which was associated with the EF exposure. Due to the inconsistency of the MLT response in the different replicates, caution should be exercised in the interpretation of this phenomenon. |
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Authors:
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J F Burchard; D H Nguyen; H G Monardes; D Petitclerc |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Bioelectromagnetics Volume: 25 ISSN: 0197-8462 ISO Abbreviation: Bioelectromagnetics Publication Date: 2004 May |
Date Detail:
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Created Date: 2004-04-28 Completed Date: 2004-09-03 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 8008281 Medline TA: Bioelectromagnetics Country: United States |
Other Details:
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Languages: eng Pagination: 308-12 Citation Subset: IM |
Copyright Information:
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Copyright 2004 Wiley-Liss, Inc. |
Affiliation:
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Department of Animal Science, McGill University, Sainte-Anne de Bellevue, QC, Canada. javier.burchard@mcgill.ca |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Cattle Electromagnetic Fields* Female Insulin-Like Growth Factor I / metabolism* Melatonin / blood* Pregnancy Progesterone / blood* Prolactin / blood* |
| Chemical | |
Reg. No./Substance:
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57-83-0/Progesterone; 67763-96-6/Insulin-Like Growth Factor I; 73-31-4/Melatonin; 9002-62-4/Prolactin |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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