| Introduction
Quality
Bioavailability
Profile
AF 2000
AF 600
Process
Dairy
Cattle
Beef Cattle
Swine
Broiler
Chickens
Chicken Breeders
Laying Hens
Market Turkeys
Turkey Breeders
Horses
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Sources of
Selenium
-
Selenium is found
naturally in plant feed ingredients, although concentrations vary
greatly depending on the region in which the feedstuff originated.
Selenium may be supplemented in either the organic or inorganic
form.
-
Organic selenium is composed largely of selenomethionine, while
inorganic selenium is simply a salt, usually sodium selenite or sodium
selenate. Selenium-enriched yeast such as SelenoSource AF is an
excellent source of organic selenium.
Selenium
Status
-
The selenium status of layers may be assessed by
measuring the level of selenium in the blood plasma or serum, whole
blood, egg, as well as blood or liver glutathione peroxidase
activity.
-
Selenium and vitamin E work together as
antioxidants, and thus proper supplementation of both is essential.
Bioavailability
of Selenium Sources
-
SelenoSource AF was at least 50% more bioavailable
than sodium selenite.
-
Organic selenium as selenomethionine may be
incorporated into body proteins such as muscle tissue and eggs,
whereas inorganic selenium cannot. Selenomethionine comprised the
major source of selenium in SelenoSource AF.
Recommendations
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