Table 1.
Summary of characteristics of studies included in the meta-analysis.
| Author (Year) | Weaned Age (Days) | Suppl. Duration (Days) | Tannin Type 1 | Tannin Source 2 | Average Weight (kg) | Tannin Dosage (mg/kg) | Parameters of Analysis 3 |
|---|---|---|---|---|---|---|---|
| Xu et al. [60] | 28 | 20 | HT | Chestnut | 8.6 | 1500 | FBW, ADFI, ADG, FCR |
| Wang et al. [38] | 21 | 14 | HT | GMTA | 5.99 ± 0.13 | 500, 1000, 1500 | FBW, ADFI, ADG, FCR |
| Wang et al. [61] | 21 | 14 | HT | GMTA | 5.99 ± 0.13 | 1000 | GSH-Px, SOD, CAT, MDA |
| Rajkovic et al. [15] | 23 | 56 | CT | Grape extract | 6.9 ± 0.1 | 148 | FBW, ADFI, ADG, FCR |
| Ma et al. [37] | 28 | 20 | CT | Quebracho | - | 2000, 3000 | FBW, ADG |
| Liu et al. [62] | 28 | 28 | HT | Chestnut wood | 7.81 ± 0.99 | 1000 | FBW, ADFI, ADG, FCR, T-AOC, SOD, GSH-Px, CAT, MDA, IgA, IgG, IgM |
| Lee et al. [36] | 21 | 28 | HT | G. tannic acid | 6.485 ± 0.66 | 125, 250, 500, 1000 | ADFI, ADG, FCR |
| Kotrotsios et al. [35] | 30 | 55 | CT | Carob pods | - | 75,000, 100,000,125,000 | FCR |
| Han et al. [63] | 28 | 28 | CT | GSP | 9.3 ± 0.5 | 250 | ADFI, ADG, FCR, SOD, GSH-Px, MDA |
| Fang et al. [32] | 28 | 28 | CT | GSP | 8.4 ± 0.17 | 40, 70, 100 | FBW, ADFI, ADG, FCR, T-AOC, SOD, GSH-Px, CAT, MDA |
| Chedea et al. [64] | 21 | 36 | CT | Grape pomace | 10.70 ± 0.8 | 50,000 | FBW, ADFI, ADG, FCR |
| Caprarulo et al. [31] | 35 | 40 | HT/CT | blend (Ch/Qu) | - | 12,500 | FBW, ADFI, ADG, FCR |
| Biagi et al. [22] | 28 | 28 | HT | Chestnut wood | 8.23 ± 0.93 | 1130, 2250, 4500 | FBW, ADFI, ADG |
| Kafantaris et al. [34] | 21 | 30 | CT | Grape pomace | 6.49 ± 0.66 | 90,000 | FBW, ADFI, ADG, FCR, GSH-Px, CAT |
| Hao et al. [33] | 21 | 28 | CT | GSP | 6.99 ± 0.11 | 50, 100, 150 | FBW, ADFI, ADG, FCR, T-AOC, SOD, GSH-Px, CAT, MDA, IgA, IgG, IgM |
| Yu et al. [65] | 21 | 28 | HT | G. tannic acid | 6.6 ± 0.27 | 1973.09, 12,004.84 | FBW, ADFI, ADG, FCR, MDA |
1 CT: condensed tannin; HT: hydrolyzable tannin. 2 GMTA: gallnut microencapsulated tannic acid; GSP: grape seed proanthocyanidins; Ch/Qu: chestnut/quebracho; G. tannic acid: gallnut tannic acid. 3 ADG: average daily gain; ADFI: average daily feed intake; FBW: final body weight; FCR: feed conversion ratio; MDA: malondialdehydes; SOD: superoxide dismutase; CAT: catalase; GSH-Px: glutathione peroxidase; T-AOC: total antioxidant capacity; IgA: immunoglobulin A; IgG: immunoglobin G; IgM: immunoglobin M.