Trace Element Supplementation of Livestock in New Zealand: Meeting the Challenges of Free-Range Grazing Systems

Figure 2

Comparison of the effects of administration of a cobaltised oral drench, a soluble vitamin B₁₂ injection, a Co-containing intraruminal bolus, and a long-acting vitamin B₁₂ injection on the serum vitamin B₁₂ concentrations of sheep. Serum vitamin B₁₂ >350 pmol/L indicates adequate vitamin B₁₂ status, above which animals are unlikely to respond to supplementation in terms of improved performance or production.