Sheep Cobalt Deficiency and Pine Disease Welfare

Cobalt deficiency prevents sheep from synthesizing vitamin B12, causing pine disease — a wasting condition with progressive weight loss, lethargy, and eventual death in severely affected animals.

Key Facts

Cobalt is required by rumen bacteria to synthesize vitamin B12, which sheep cannot obtain directly from soil
Deficiency occurs on leached, acidic soils with cobalt levels below 0.07 mg/kg dry matter
Clinical pine disease causes progressive weight loss, lethargy, pale membranes, wool break, and death
Affected lambs lag behind the flock and show poor thrive despite adequate food availability
Blood vitamin B12 levels below 200 pmol/L indicate deficiency before clinical signs develop
Cobalt supplementation via drenching, boluses, or topdressing pastures corrects the deficiency effectively
Soil pH management that raises pH above 6.2 improves cobalt availability from the soil

Welfare Considerations

Pine disease causes a slow deterioration that is easily missed until animals are significantly affected. The lethargy and poor thrive that characterize cobalt deficiency mean that affected lambs spend less time active, interact less with flock mates, and experience a generally reduced quality of life compared to healthy individuals. The progressive nature of the disease — worsening without supplementation — means that delayed diagnosis results in extended suffering. Prevention through soil testing and strategic supplementation is straightforward and cost-effective. The geographic predictability of cobalt-deficient soils means that farmers in affected areas can implement preventive programs without waiting for clinical disease to appear.

What You Can Do

Test soils and blood vitamin B12 levels in flocks on leached, acidic soils where cobalt deficiency is likely
Implement cobalt supplementation through drenching or slow-release boluses in deficient areas
Monitor lamb growth rates and thrive as early indicators of subclinical cobalt deficiency
Consider lime application to raise soil pH above 6.2 and improve cobalt availability from pastures
Work with your veterinarian to establish a monitoring protocol for cobalt status in your sheep flock