Table 1 Consensus serum IgG concentrations and equivalent total protein (TP) and Brix measurements, and percentage of calves recommended in each transfer of passive immunity category
| Passive transfer of immunity category | Serum IgG category (g/L) | Equivalent serum total protein (g/L) | Equivalent serum Brix % | Recommended percentage of calves on farm in category |
|---|---|---|---|---|
| Excellent | ≥ 25.0 | ≥ 62 | ≥ 9.4 | > 40 |
| Good | 18.0–24.9 | 58–61 | 8.9–9.3 | ~ 30 |
| Fair | 10.0–17.9 | 51–57 | 8.1–8.8 | ~ 20 |
| Poor | < 10.0 | < 51 | < 8.1 | < 10 |