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PICO framework used in this meta-analysis.
| PICO | Search strategy | Exclusion criteria |
|---|---|---|
| Population | Broiler chickens | Any chickens apart from broilers |
| Intervention | Grape pomace | Not in grape pomace |
| Comparators | Control group without grape pomace | |
| Outcomes | Growth performance, Carcass traits, and meat colour. |
