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. 2017 Jan 25;54(1):1–12. doi: 10.2141/jpsa.0160121

Fig. 2.

Fig. 2.

Illustration of the egg laying stage and egg-related traits investigated. Chickens were reared over the course of a year from hatching. Eggs were inspected for external and internal traits at early (first egg age), middle (300-days-old), and late (400-days-old) egg laying stages. Egg production rates were calculated every four weeks for 22- to 62-week-old.