Table 4.
Total antioxidant activity estimated through the hydroxyl radical scavenging (DPPH) and the ferric reducing ability of plasma (FRAP) assays, total phenolic concentration (TPC) and Haptoglobin concentration by sheep at the beginning (Baseline) and at the end of the study by 2 groups of lambs (N = 8) receiving 2-way choices between isoenergetic feeds that varied in the concentration of CP and the addition of a mix (4% DM) of condensed and hydrolizable tannins
| Baseline | End of Study | |||||||
|---|---|---|---|---|---|---|---|---|
| HP − LP−1 | HP + LP + 2 | SE3 | P value | HP − LP−1 | HP + LP + 2 | SE | P value | |
| DPPH, % | 10.40 | 12.48 | 1.61 | 0.21 | 9.02 | 10.07 | 1.23 | 0.40 |
| FRAP, µmol FeSO4 Eq/L | 327.72 | 288.09 | 38.01 | 0.31 | 312.44 | 281.55 | 46.34 | 0.51 |
| TPC, mg galic acid/mL | 2.87 | 2.69 | 0.17 | 0.32 | 2.76 | 2.70 | 0.33 | 0.86 |
| Haptoglobin, ng/mL | 726.09 | 736.08 | 133.17 | 0.94 | 536.40 | 591.47 | 52.94 | 0.31 |
1Lambs received a choice between diets containing low (LP) and high (HP) concentrations of CP without the addition of tannins (HP − LP−; Control), and with the addition of tannins in both diets (HP + LP+).
2Standard error.