SELENIUM CONCENTRATIONS IN BRITISH COLUMBIA FORAGES, GRAINS, AND PROCESSED FEEDS

1975 ◽  
Vol 55 (1) ◽  
pp. 101-111 ◽  
Author(s):  
J. E. MILTIMORE ◽  
A. L. van RYSWYK ◽  
F. M. CHAPMAN ◽  
C. M. KALNIN ◽  
W. L. PRINGLE
Keyword(s):  
British Columbia ◽  
Selenium Status ◽  
Minimum Requirement ◽  
High Selenium ◽  
Selenium Analysis

Samples of hay, silage and grains grown throughout British Columbia and samples of ration components available in British Columbia were analyzed for selenium in order to characterize the selenium status of feeds available for livestock. There were nutritionally important differences between the same feeds grown in different regions and between different feeds within a region. Even within a region featuring relatively high selenium concentrations, many feeds were found to be below the 0.1 ppm minimum requirement for livestock. A selenium analysis of feeds appears necessary in order to supplement livestock appropriately.

Response of Selenium Status Indicators to Supplementation of Healthy North American Men with High-Selenium Yeast

2008 ◽  
Vol 122 (2) ◽  
pp. 107-121 ◽  
Author(s):  
Wayne Chris Hawkes ◽  
B. Diane Richter ◽  
Zeynep Alkan ◽  
Elaine C. Souza ◽  
Monique Derricote ◽  
...  
Keyword(s):  
North American ◽  
Selenium Status ◽  
Selenium Yeast ◽  
High Selenium

The effect of selenium on infertility in ewes grazing improved pastures

1970 ◽  
Vol 10 (47) ◽  
pp. 672 ◽  
Author(s):  
KO Godwin ◽  
RE Kuchel ◽  
RA Buckley
Keyword(s):  
Oral Dose ◽  
Whole Blood ◽  
Sodium Selenite ◽  
South Australia ◽  
Subterranean Clover ◽  
Trifolium Subterraneum ◽  
Biochanin A ◽  
Elemental Selenium ◽  
Selenium Status ◽  
Selenium Analysis

Trials conducted in South Australia, in an area where pasture improvement by means of the introduction of subterranean clovers has been practised for 10-15 years, have shown a significant improvement in fertility, in ewes treated with selenium. Analysis of all pastures grazed, and of whole blood of stock grazing them, indicated that the selenium status of the feed and of the animals was low. Phyto-oestrogen assays showed the presence of the isoflavones formononetin, genistein, and biochanin A, in the subterranean clover, which was mainly the cultivar Yarloop (Trifolium subterraneum L. var. Yarloop). Administration of selenium four to eight weeks before mating, given either as an oral dose of sodium selenite, or supplied in the form of an intraruminal selenium pellet containing elemental selenium and iron, led to an improvement in fertility; in some cases from 49 to 76 per cent. Also, lamb mortality was reduced by selenium administration to the ewes. There were differences due to selenium administration (P<0.001). Ewe fertility differed between pastures designated 'oestrogenic' and 'non-oestrogenic' (P<0.05). But no interaction between selenium and the presence of phyto-oestrogens could be shown by these experiments. The results are discussed in relation to the problem of infertility associated with the grazing of improved pastures

scholarly journals The use of high-selenium yeast to raise selenium status: how does it measure up?

2004 ◽  
Vol 92 (4) ◽  
pp. 557-573 ◽  
Author(s):  
Margaret P. Rayman
Keyword(s):  
Immune Response ◽  
Intervention Studies ◽  
Single Species ◽  
Control Measures ◽  
Selenium Status ◽  
The European Union ◽  
Selenium Yeast ◽  
Intake Level ◽  
High Selenium ◽  
Study Intervention

Selenium-enriched yeast (Se-yeast) is a common form of Se used to supplement the dietary intake of this important trace mineral. However, its availability within the European Union is under threat, owing to concerns expressed by the European Community (EC) Scientific Committee on Food that Se-yeast supplements are poorly characterised and could potentially cause the build up of Se in tissues to toxic levels. The present review examines the validity of these concerns. Diagrams of the biosynthesis and metabolism of Se compounds show which species can be expected to occur in Se-yeast preparations. Se-yeast manufacture is described together with quality-control measures applied by reputable manufacturers. The way in which speciation of Se-yeast is achieved is explained and results on amounts of Se species in various commercial products are tabulated. In all cases described, selenomethionine is the largest single species, accounting for 54–74 % of total Se. Se-yeast is capable of increasing the activity of the selenoenzymes and its bioavailability has been found to be higher than that of inorganic Se sources in all but one study. Intervention studies with Se-yeast have shown the benefit of this form in cancer prevention, on the immune response and on HIV infection. Of about one dozen supplementation studies, none has shown evidence of toxicity even up to an intake level of 800 μg Se/d over a period of years. It is concluded that Se-yeast from reputable manufacturers is adequately characterised, of reproducible quality, and that there is no evidence of toxicity even at levels far above the EC tolerable upper intake level of 300 μg/d.

COPPER, ZINC, MANGANESE AND IRON VARIATION IN FIVE FEEDS FOR RUMINANTS

1970 ◽  
Vol 50 (2) ◽  
pp. 293-300 ◽  
Author(s):  
J. E. MILTIMORE ◽  
J. L. MASON ◽  
D. L. ASHBY
Keyword(s):  
British Columbia ◽  
Research Council ◽  
Copper Deficiency ◽  
Agricultural Research ◽  
Corn Silage ◽  
Minimum Requirement ◽  
Agricultural Research Council ◽  
Minimum Requirements ◽  
Copper Zinc ◽  
Recommended Level

Samples of legume hay, grass hay, corn silage, oat forage and grains grown throughout British Columbia were analyzed to determine Cu, Zn, Mn and Fe concentrations and these concentrations were compared with the British Agricultural Research Council minimum requirements for cattle. Approximately 95% of all feeds were below 10 ppm Cu, the recommended minimum for cattle. These data provide the first indication of a general simple copper deficiency in British Columbia, whereas previous reports for British Columbia and Canada concerned pockets of copper deficiency resulting from molybdenum toxicity. Some 95% of the samples were below the minimum recommended level of 50 ppm Zn. Manganese concentrations were somewhat higher, with only 40% of the samples below the recommended minimum of 40 ppm Mn. Twenty-five percent of the grass samples contained above 151 ppm Mn. The average Fe concentration for all feeds was well above the suggested minimum requirement of 30 ppm. Some 15% of the samples were sevenfold the minimum recommended. These analyses suggest the need for greatly increased levels of Cu and Zn supplementation for cattle on winter feed. There is also need for Mn supplementation where legume hays and corn silages are fed in British Columbia.

Comparison of selenium status in sheep after short-term exposure to high-selenium-fertilized forage or mineral supplement

2009 ◽  
Vol 82 (1) ◽  
pp. 40-45 ◽  
Author(s):  
Jean A. Hall ◽  
Robert J. Van Saun ◽  
Tom Nichols ◽  
Wayne Mosher ◽  
Gene Pirelli
Keyword(s):  
Selenium Status ◽  
Short Term ◽  
Mineral Supplement ◽  
Short Term Exposure ◽  
High Selenium

Effect of selenium status and supplementation with high-selenium yeast on plasma homocysteine and B vitamin concentrations in the UK elderly

2008 ◽  
Vol 52 (11) ◽  
pp. 1324-1333 ◽  
Author(s):  
Bram Bekaert ◽  
Matthew L. Cooper ◽  
Fiona R. Green ◽  
Helene McNulty ◽  
Kristina Pentieva ◽  
...  
Keyword(s):  
Plasma Homocysteine ◽  
Selenium Status ◽  
Selenium Yeast ◽  
High Selenium ◽  
The Uk ◽  
B Vitamin
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