Cement kiln dusts as a selenium source in sheep rations

Area of Science:

• Environmental Science
• Animal Nutrition
• Toxicology

Background:

• Cement production involves coal combustion, potentially releasing selenium-rich fly ash.
• Selenium is an essential trace element, but excessive intake can be toxic.

Purpose of the Study:

• To investigate cement dust as a dietary source of selenium in sheep.
• To determine the impact of cement dust ingestion on selenium levels in sheep tissues and blood.
• To assess potential adverse effects of cement dust consumption on sheep health.

Main Methods:

• Sheep were fed rations containing 3% cement dust for 165 days.
• Cement dust was collected from different locations within the cement manufacturing process.
• Selenium concentrations in blood and tissues were measured and compared to control groups.

Main Results:

• Sheep fed cement dust showed significantly elevated selenium levels in blood and tissues.
• No observable tissue abnormalities or adverse health effects were noted in the treated sheep.
• Selenium levels correlated with the proximity of dust collection to the kiln's coal-fired end.

Conclusions:

• Cement dust, likely due to its fly ash content from coal combustion, serves as a significant source of selenium for sheep.
• Dietary supplementation with cement dust at 3% by weight did not induce toxicity in sheep under the study conditions.
• Further research is warranted to fully understand selenium bioavailability and potential long-term effects from cement dust exposure in livestock.