Poultry Pre-Lay Development and Welfare

The pre-lay development period in pullets (young hens before laying begins) establishes baseline health and welfare that determines outcomes throughout the production period.

Key Facts

The rearing period from day-old chick to point-of-lay at approximately 16-18 weeks determines skeletal strength, bone density, and social development.
Calcium metabolism established during rearing affects the incidence of osteoporosis and keel bone fractures during lay.
Social familiarity established in rearing groups influences aggression levels when pullets are moved to laying facilities.
Light management during rearing controls reproductive development timing and must be managed precisely.
Pullets reared in enriched environments adapt more readily to enriched laying facilities than those reared in barren conditions.

Welfare Considerations

Pullet rearing welfare investment pays dividends throughout the production life of laying hens. Hens with stronger bones, established social groups, and familiarity with enriched environments have lower rates of keel bone fracture, injurious pecking, and stress responses to novel environments. The rearing period is a welfare opportunity that is poorly recognized relative to the laying period in welfare policy and assurance schemes.

What You Can Do

Support certification schemes that extend welfare auditing to the rearing period as well as laying facilities.
Advocate for rearing standards that match the environmental complexity of the production environment hens will enter.
Support research into rearing practices that optimize bone development and social welfare for laying hen lifetime outcomes.
Choose egg products from systems with known rearing welfare standards, not just laying facility standards.