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is to raise the quality of the cells by getting the nurse bees "into practice" making RJ for the emergency cells they start, so they generally do a better job of building out larger, better supplied, queen cells for you.
I shake my nurse bees into my cell starter. Nurse bees should already be producing RJ, no reason to try and get them producing it. I keep it going by adding new brood every 7 to 14 days. Doing this I almost always get large healthy cells and the few that might be small (maybe 2-4 out of 45) I pull out and don't use. I have been running 45 grafts every 7 days and moving them to the incubator after they are capped. I can keep the cell builders going all season this way. When I pick my frams of bood I try to find emerging brood with some young larvae. The young uncapped larvae keeps the chance of a mite from getting in the queen cells. I just make sure I check for queen cells in that frame when doing my 24-48 hour check of the cells. By the time I get to my 4th week of grafts my cell builders are busting out with bees.