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Experimental design.
| Hatching condition | Control group | Delayed group | ||
|---|---|---|---|---|
| Oil provision | No | Yes | No | Yes |
| Group name | W-C | EO-C | W-D | EO-D |
| EXPERIMENT 1 | ||||
| Water | 24 (4 × 6)* | 24 (4 × 6) | ||
| Cardamom EO | 24 (4 × 6) | 24 (4 × 6) | ||
| Marjoram EO | 24 (4 × 6) | 24 (4 × 6) | ||
| Verbena EO | 24 (4 × 6) | 24 (4 × 6) | ||
| EXPERIMENT 2 | ||||
| Water | 96 (16 × 6) | 96 (16 × 6) | ||
| EO provision† | 96 (16 × 6) | 96 (16 × 6) | ||
(number of chicks × number of pens).
EO provision = cardamom EO and marjoram EO and verbena EO.
