Table 3.
Meta-regression of the effects of tannin source dosage on measured growth outcomes.
| Variable a | Model Results | Heterogeneity b | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 95% CI b | TM | Mixed Model Effects | ||||||||
| Estimate | SE b | p-Value | Lower | Upper | QM | τ2 | τ | I2 (%) | R2 | |
| ADFI, g/day | ||||||||||
| GSP | −0.0118 | 0.0054 | 0.0297 | −0.0224 | −0.0012 | 4.7277 | 0.8393 | 0.9161 | 90.27 | 40.74 |
| GMTA | −0.0015 | 0.0013 | 0.2556 | −0.0040 | 0.0011 | 1.2923 | 2.1981 | 1.4826 | 95.53 | 6.01 |
| ADG, g/day | ||||||||||
| Chestnut | −0.0013 | 0.0046 | 0.7806 | −0.0103 | 0.0077 | 0.0776 | 174.7742 | 13.2202 | 99.88 | 0.00 |
| GMTA | 0.0136 | 0.0102 | 0.1799 | −0.0063 | 0.0335 | 1.7983 | 142.6673 | 11.9443 | 96.53 | 12.37 |
| GSP | −0.0071 | 0.0090 | 0.4322 | −0.0247 | 0.0106 | 0.6169 | 2.4329 | 1.5598 | 95.82 | 0.00 |
| FBW, kg | ||||||||||
| Chestnut | 0.0001 | 0.0008 | 0.8811 | −0.0015 | 0.0017 | 0.0224 | 5.3567 | 2.3145 | 97.57 | 0.00 |
| GSP | −0.0113 | 0.0158 | 0.4733 | −0.0422 | 0.0196 | 0.5143 | 1.9417 | 1.3935 | 95.15 | 0.00 |
| GMTA | 0.0002 | 0.0007 | 0.7497 | −0.0011 | 0.0015 | 0.1018 | 0.00 | 0.00 | 0.00 | 0.00 |
| Carob pods | −0.0000 | 0.0001 | 0.5469 | −0.0001 | 0.0001 | 0.3628 | 4.1985 | 2.0490 | 98.17 | 0.00 |
| FCR | ||||||||||
| GMTA | 0.0015 | 0.0022 | 0.4800 | −0.0027 | 0.0057 | 0.4989 | 6.4586 | 2.5414 | 97.33 | 0.00 |
| GSP | 0.0047 | 0.0091 | 0.6079 | −0.0132 | 0.0226 | 0.2633 | 2.4616 | 1.5690 | 95.18 | 0.00 |
a ADFI: average daily feed intake; ADG: average daily gain; FBW: final body weight; FCR: feed conversion ratio; GSP: grape seed proanthocyanidins; GMTA: gallnut microencapsulated tannic acid. b SE: standard error; CI: confidence interval; TM: test of moderators; QM: model sum of squares; I2: Higgens statistics; τ2: heterogeneity variance of true effect size; τ: standard deviation of true effect size; R2: percentage of variation explained by the model.