We have 14 new layers....some have started, some are not quite there yet. The other day, we had a broken egg in the nest. One of the barred rocks was eating it when we discovered it. We had not had this happen before. Been getting eggs for several weeks, 4-9 per day. Then, yesterday, 2 out of the 6 were broken....someone is breaking eggs. We check at least twice a day, but how can we deter this? Also, we do have a bowl of oyster shells as well as grit so that is not a problem either. THere are 4 large nesting boxes and then space under each where a few think is their nesting box. There are enough boxes per hen.....plus, only about 9 out of the 14 are laying right now....and that has JUST started...only about 2 or 3 were laying for the previous several weeks. The yare all new.