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| Date of Cull (2009) | Day length (h:min) |
|---|---|
| 20th January | 8:27 |
| 3rd February | 9:12 |
| 17th February | 10:05 |
| 3rd March | 11:01 |
| 17th March | 11:58 |
| 31st March | 12:55 |
| 21st April | 14:19 |
| 19th May | 15:56 |
| 16th June | 16:47 |
Date of cull and corresponding day length experienced by Siberian hamsters born between March and April 2008 housed outdoors in natural photoperiod.
