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I’m planning to start layers farming. Pls what size is needed for 1000 birds?

Use a stocking density of 5 birds per m2.

To update, the amount of space will depend on their age, but you have to build the pen base on their adult age which is 19-78 weeks or until you sell them. For that age range space reqd is 5 birds/m2. So 1000 birds will need 200m2. Don't give the whole space to them when they're young. But as they grow, slowly expand the space.