I have heard that they will take their own breaks every 2-3 years. So far that's what I have experienced personally. One girl laid 3 years in a row and took last year off. I have another girl that has laid 2 years in a row and will hopefully lay again this year, and 2 girls that laid 1 year and took the next year off. Granted I haven't been breeding long, but that's what I've seen so far.