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Table I.
Growth factor concentrations relative to protein and ratios of protein extracts at different stages of lactation.
| Growth factors | Stage of lactation |
||||
|---|---|---|---|---|---|
| < 12 h | 12 h | 24–48 h | 3–6 days | 7–21 days | |
| TGF-β2 (ng·g protein−1) | 1799 | 1855 | 1131 | 414 | 169 |
| TGF-β1 (ng·g protein−1) | 115 | 119 | 63 | 20 | 22 |
| IGF-I (ng·g protein−1) | 568 | 647 | 321 | 48 | < DL1 |
| TGF-β2/TGF-β1 | 15.6 | 15.6 | 18.0 | 20.7 | 7.7 |
| TGF-β1 + TGF-β2/IGF-I | 3.4 | 3.1 | 3.7 | 9.0 | < DL |