Depends. I wait until my girls not only have reached their weight before breeding last year (preferably more) but also look healthy, round and overall in good health. If all that applies, the soonest I will start breeding them is 6-7 months after they lay. However, Ive also noticed that most of my girls tend to develop follicles the same time every year, so if they need a few more months to gain weight back I dont get too concerned.