Risks and benefits in agricultural uses of selenium

Area of Science:

• Agricultural Science
• Environmental Science
• Animal Nutrition

Background:

• Selenium deficiency in soils and crops is a global issue, impacting animal health and productivity.
• Animal supplementation with selenium has been practiced for 30 years to improve performance in deficient areas.
• Concerns exist regarding potential selenium toxicity from combined environmental and agricultural sources.

Purpose of the Study:

• To evaluate the risks of selenium toxicity associated with animal supplementation.
• To compare selenium supplementation levels with other environmental and industrial sources.
• To assess the overall safety of current selenium supplementation practices.

Main Methods:

• Review of existing literature on selenium deficiency and toxicity.
• Analysis of agricultural, environmental, and industrial factors influencing selenium levels.
• Comparison of selenium input from animal supplementation versus other sources.

Main Results:

• Established animal supplementation uses of selenium are small in comparison to other sources.
• Current practices do not significantly increase overall environmental or human exposure to selenium.
• No evidence suggests animal supplementation contributes to selenium toxicity concerns.

Conclusions:

• Current selenium supplementation levels for domestic animals are safe.
• Animal supplementation does not pose a hazard to animal health, human health, or the environment.
• The benefits of selenium supplementation in deficient regions outweigh the minimal risks.