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1. A time‐lapse photographic technique has been developed which enables routine recording of the hatching times of up to 192 chicken embryos.
2. Storage of eggs for 14 d caused a delay of 134 h in the mean total incubation period.
3. Female embryos hatched about 3 h earlier than males in the non‐stored eggs but there was no difference between the sexes in eggs stored for 14 d.
4. Rate of weight loss during incubation was similar in both non‐stored and stored eggs: there was no relationship between weight loss at 19 d incubation and total incubation period.
5. Hatchability of fertile eggs was 19.5% lower in eggs stored for 14 d and proportionately more embryos died between 4 d and 18 d incubation than in the non‐stored eggs.
