Vitamin and Mineral Supplementation in Sheep: When and Why

Strategic vitamin and mineral supplementation in sheep prevents deficiency-related disease and supports welfare through targeted intervention.

Key Facts

Selenium deficiency causes white muscle disease (nutritional myopathy) in lambs and adults
Vitamin E works synergistically with selenium - deficiency of either causes similar signs
Cobalt deficiency causes pine - a wasting disease with profound welfare impact
Iodine deficiency causes goitre and stillbirth or weak lamb syndrome in neonates
Copper deficiency causes swayback and ill-thrift but over-supplementation causes fatal toxicity
Supplementation via bolus, injection, or dietary inclusion must be based on identified deficiency
Regional soil and pasture analysis guides supplementation programs for specific deficiencies

Welfare Considerations

Vitamin and mineral deficiencies cause genuine suffering - white muscle disease leaves lambs unable to stand or suckle; cobalt deficiency causes progressive wasting and weakness; iodine deficiency kills or weakens newborn lambs. Yet indiscriminate supplementation can be fatal - copper toxicity kills sheep. Evidence-based supplementation guided by blood and liver testing, combined with soil and forage analysis, prevents both deficiency and toxicity. Targeted supplementation is welfare-positive; guesswork is welfare-neutral at best and potentially harmful.

What You Can Do

Test blood or liver mineral levels before implementing any mineral supplementation program
Use forage and soil analysis to identify regional deficiency risks on your farm
Supplement specific deficiencies at appropriate doses - do not use broad-spectrum supplements without need
Monitor flock health outcomes after supplementation changes to assess effectiveness
Never supplement copper without establishing need - copper toxicity kills sheep at relatively low excess doses