When laying hens are fed 0.6 mg/kg of selenized glucose, their egg yolks contain more selenium and less malondialdehyde than when fed sodium selenite.
Mechanism
Synthesis from 1 study
Selenized glucose gives hens more usable selenium than regular selenium supplements. This selenium builds a powerful antioxidant enzyme that cleans up harmful fats in the egg yolk, stopping them from spoiling. As a result, the yolk holds more selenium and stays fresher longer.
Most probable mechanism
When hens eat selenized glucose, their bodies absorb more selenium than when they eat regular selenium supplements. This extra selenium gets built into a key antioxidant enzyme that cleans up harmful fats in the egg yolk, preventing them from breaking down into damaging compounds. As a result, the yolk holds more selenium and stays fresher with less spoilage.
Selenized glucose is absorbed more efficiently in the gastrointestinal tract than sodium selenite, leading to higher systemic selenium levels
Absorbed selenium is incorporated into selenocysteine, the active component of glutathione peroxidase, increasing the enzyme's concentration and catalytic activity in plasma, liver, oviduct, and egg yolk
Elevated glutathione peroxidase activity reduces lipid hydroperoxides to non-reactive alcohols, preventing their decomposition into malondialdehyde
Reduced lipid peroxidation preserves selenium in the yolk and prevents degradation of xanthophyll pigments and polyunsaturated fatty acids, increasing selenium concentration and improving yolk color and fatty acid profile
Less supported by current evidence, but not ruled out
Higher selenium levels reduce damage to the proteins that guide calcium formation in the eggshell, resulting in thicker shells and better mineral content.
Selenium accumulates in oviduct tissue, enhancing glutathione peroxidase activity and reducing local oxidative stress
Reduced oxidative stress prevents degradation of organic matrix proteins involved in calcium carbonate crystallization
Intact matrix proteins enable more efficient deposition of calcium carbonate, increasing shell thickness and ash content
Selenium creates a less oxidative environment in the gut, allowing beneficial bacteria to grow, which may improve overall nutrient absorption and antioxidant status.
Selenium increases antioxidant enzyme activity in the intestinal mucosa
Lower oxidative stress in the gut lumen favors proliferation of lactic acid bacteria and inhibits oxidative stress-sensitive pathogens
Increased lactic acid bacteria population correlates with higher systemic glutathione peroxidase activity
Evidence from Studies
Supporting (1)
Community contributions welcome
Contradicting (0)
Community contributions welcome
Gold Standard Evidence Needed
According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.