| Effect of duration and level of supplementation of diets of lactating dairy cows with selenized yeast on selenium concentrations in milk and blood after the withdrawal of supplementation. | |
| | |
MedLine Citation:
|
PMID: 21524524 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
|
Cows' milk containing elevated concentrations of Se provides a rich nutritional source of this essential element for meeting daily nutritional requirements or providing health benefits in humans with low immune function or at risk of cancer. An experiment involving either 2 or 6 wk of dietary supplementation with Se yeast (with the yeast supplying about 30, 40, and 60mg of Se/d for cows supplemented for 2 wk, and about 20, 30, 40, and 60mg of Se/d for cows supplemented for 6 wk), and 21 wk of monitoring of Se status after the withdrawal of supplementation, was undertaken between September 2008 and April 2009 using 35 multiparous Holstein-Friesian cows. Using milk and blood Se concentrations as surrogates, the research examined the time taken for Se build-up in tissue due to supplementation of lactating dairy cows with Se yeast to dissipate back to normal levels. At the end of Se supplementation, a significant relationship was found between milk Se concentration and Se intake, whereby milk Se concentration had increased by 4.5μg of Se/kg of milk for each mg of Se eaten per day, but no effect of duration of supplementation on this relationship was observed. At the same time, both Se intake and duration of supplementation affected blood Se concentration; it increased by 3.6μg of Se/kg of blood for each mg of Se eaten per day, and was 86μg of Se/kg higher after 6 wk compared with 2 wk of supplementation. After the withdrawal of Se supplementation, milk Se concentrations responded quickly to the change in the quantity of Se consumed, and again, duration of supplementation had no effect on the response, but any effect that Se intake had on milk Se had completely dissipated by 4 wk. In contrast to milk, blood Se concentrations continued to be affected by both amount and duration of Se supplementation for at least 4 mo after the withdrawal of supplementation, although by 5 mo the effects of the previous supplementation treatments had virtually disappeared. The slow decline in blood Se concentrations after the withdrawal of supplementation would most likely be due to the protracted clearance of Se from the various tissues that had accumulated Se during supplementation and the rate of erythrocyte turnover. When undertaking an on-farm Se enhancement program to generate milk for the manufacture of Se-enriched milk products, post-supplementation milk Se concentrations are unlikely to create any problems at the milk factory beyond 4 wk, but the high residual blood/tissue Se concentrations that take considerably more time to dissipate may provide the potential for possible unintended consequences at the food chain/farm environment level. |
| | |
Authors:
|
C R Stockdale; H S Gill |
Related Documents
:
|
18430554 - Soybean diet improves insulin secretion through activation of camp/pka pathway in rats. 3623194 - Effects of dietary sugar and of dietary fat on food intake and body fat content in rats. 2782864 - Intake of greasy diets in hypothalamic obesity: a re-assessment. 7007594 - Long-term effects of moderate fructose feeding on glucose tolerance parameters in rats. 8219904 - Cadmium, zinc, and copper levels in the kidneys and liver of the inhabitants of north-e... 9684744 - Differences in apolipoprotein and lipid composition between human chylomicron remnants ... |
Publication Detail:
|
Type: Journal Article |
Journal Detail:
|
Title: Journal of dairy science Volume: 94 ISSN: 1525-3198 ISO Abbreviation: J. Dairy Sci. Publication Date: 2011 May |
Date Detail:
|
Created Date: 2011-04-28 Completed Date: - Revised Date: - |
Medline Journal Info:
|
Nlm Unique ID: 2985126R Medline TA: J Dairy Sci Country: United States |
Other Details:
|
Languages: eng Pagination: 2351-9 Citation Subset: IM |
Copyright Information:
|
Copyright © 2011 American Dairy Science Association. Published by Elsevier Inc. All rights reserved. |
Affiliation:
|
Department of Primary Industries, Future Farming Systems Research Division, Kyabram Centre, 120 Cooma Road, Kyabram Victoria 3620, Australia. |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
|
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Changes in hoof health and animal hygiene in a dairy herd after covering concrete slatted floor with...
Next Document: Latent class evaluation of a milk test, a urine test, and the fat-to-protein percentage ratio in mil...