TABLE 3.
Frequency of beef cow colostrum samples in different strata and interval likelihood ratios for various Brix percentage (%) ranges
| Brix range (%) | Lab A (n = 364) | Lab B (n = 271) | Lab C (n = 220) | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Colostrum IgG < 100 g/La | |||||||||
| Total n | Samples <100 g/L | Likelihood ratio (95% CI) | Total n | Samples <100 g/L | Likelihood ratio (95% CI) | Total n | Samples <100 g/L | Likelihood ratio (95% CI) | |
| ≤21.9 | 25 | 14 | 16.83 (8.82‐32.11) | 25 | 21 | 25.73 (10.74‐66.51) | 8 | 4 | 11.21 (3.56‐35.31) |
| 22‐23.9 | 21 | 5 | 4.75 (2.05‐11.02) | 11 | 4 | 3.80 (1.31‐11.03) | 14 | 5 | 6.73 (2.74‐16.49) |
| 24‐25.9 | 41 | 1 | 0.66 (0.17‐2.56) | 34 | 7 | 1.74 (0.85‐3.53) | 27 | 4 | 2.34 (1.01‐5.42) |
| 26‐27.9 | 73 | 0 | 0.18 (0.03‐1.26) | 33 | 2 | 0.57 (0.18‐1.77) | 31 | 0 | 0.35 (0.05‐2.42) |
| 28‐29.9 | 60 | 0 | 0.22 (0.03‐1.53) | 64 | 0 | 0.09 (0.01‐0.66) | 40 | 0 | 0.27 (0.05‐0.19) |
| ≥30 | 144 | 0 | 0.09 (0.01‐0.64) | 104 | 0 | 0.06 (0.01‐0.40) | 100 | 0 | 0.11 (0.02‐0.75) |
| Colostrum IgG ≥ 150 g/L a | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Total n | Samples ≥ 150 g/L | Likelihood ratio (95% CI) | Total n | Samples ≥ 150 g/L | Likelihood ratio (95% CI) | Total n | Samples ≥ 150 g/L | Likelihood ratio (95% CI) | |
| ≤21.9 | 25 | 1 | 0.04 (0.01‐0.25) | 25 | 0 | 0.05 (0.01‐0.35) | 8 | 0 | 0.12 (0.02‐0.91) |
| 22‐23.9 | 21 | 1 | 0.04 (0.01‐0.31) | 11 | 0 | 0.10 (0.01‐0.79) | 14 | 0 | 0.07 (0.01‐0.52) |
| 24‐25.9 | 41 | 6 | 0.14 (0.06‐0.33) | 34 | 6 | 0.30 (0.14‐0.66) | 27 | 2 | 0.12 (0.04‐0.39) |
| 26‐27.9 | 73 | 27 | 0.49 (0.32‐0.75) | 33 | 8 | 0.43 (0.21‐0.89) | 31 | 8 | 0.40 (0.19‐0.81) |
| 28‐29.9 | 60 | 40 | 1.66 (1.01‐2.72) | 64 | 30 | 1.10 (0.72‐1.68) | 40 | 13 | 0.53 (0.29‐0.95) |
| ≥30 | 144 | 124 | 5.14 (3.36‐7.86) | 104 | 76 | 3.30 (2.32‐4.73) | 100 | 84 | 5.27 (3.35‐8.28) |
Abbreviations: CI, confidence interval; IgG, immunoglobulin G.
a
As determined by radial immunodiffusion.