Table 1.
Descriptive statistics of serum IgG category and arrival weights stratified by treatment group from 3 field trials evaluating the efficacy of feeding a colostrum supplement in milk replacer for 14 d to preweaned calves
| Treatment group1 | Serum IgG, mg/dL |
IgG category,2 n (ndead) |
Arrival weight, kg |
Weight category,3 n |
|||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Mean | SD | Total | APT | PFPT | FPT | Mean | SD | Low | Mid | High | |
| CS | 1,147 | 1,138 | 92 (13) | 34 (1) | 44 (6) | 14 (6) | 41.3 | 5.7 | 36 | 32 | 24 |
| PS | 1,210 | 1,210 | 91 (13) | 34 (1) | 37 (4) | 20 (8) | 42 | 5.4 | 22 | 43 | 26 |
| UC | 1,352 | 1,711 | 90 (12) | 36 (0) | 36 (5) | 18 (7) | 41.8 | 5.3 | 26 | 36 | 28 |
| Total | 1,236 | 1,372 | 273 (38) | 104 (2) | 117 (15) | 52 (21) | 41.7 | 5.4 | 84 | 111 | 78 |
1
CS = colostrum supplement (70 g of dried colostrum powder) added to milk replacer; PS = placebo supplement (70 g of nutritionally matched supplement without IgG) added to milk replacer; UC = unsupplemented control.
2
APT = adequate passive transfer: IgG ≥1,000 mg/dL; PFPT = partial failure of passive transfer: IgG between (and including) 351 and 999 mg/dL; and FPT = failure of passive transfer: IgG ≤350 mg/dL.
3
Low: ≤38.5 kg; mid: between 38.6 and 45 kg; high: ≥45 kg.