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Selenium Deficiency in Sheep: Welfare and Supplementation

Selenium deficiency causes white muscle disease and reproductive problems in sheep. This guide covers welfare impacts and prevention.

Key Facts

Selenium is essential for muscle function, immunity, and reproductive health
Deficiency causes white muscle disease (nutritional muscular dystrophy) in lambs
Affected lambs show weakness, inability to stand, and difficulty suckling
Selenium deficiency also causes reduced fertility and poor immune function
UK soils are often selenium-deficient, making supplementation essential
Excess selenium is toxic — careful dosing of supplements is critical

Welfare Considerations and Management

Welfare-centred selenium management requires soil and blood testing to confirm deficiency before supplementation. Slow-release boluses, injectable selenium, and selenium-enriched fertilisers are supplementation options. Acute white muscle disease in lambs is treated with injectable selenium/vitamin E. Dosing must be carefully calculated as the therapeutic margin is narrow. A vet or nutritionist should guide supplementation programmes.

What You Can Do

Test soil selenium levels and blood samples before starting supplementation
Work with your vet to design an appropriate selenium supplementation programme
Treat affected lambs promptly with injectable selenium/vitamin E
Monitor ewes' selenium status to prevent deficiency affecting lambs