The effects of space allowance and group size on egg production traits and profitability 1

1. The productivity and profitability of two commercial strains of WL were measured simultaneously at space allowances of 0–0310, 0–0387 and 0.0464 m2 per bird and in groups of three, six and 12 birds per cage. 2. Space and group effects were independent and additive, the latter being the more important in determining profitability. 3. A space allowance of 0–0310 m2 per bird adversely affected production and increased food consumption, possibly the result of increased interaction between birds. 4. Depopulation at 12 to 13 months of lay was calculated to maximise average monthly egg margin over food and bird costs and to minimise the problems of egg quality associated with the aging pullet.