The blobs you are talking about are the placenta (it's an inverted placenta sac with a disc), however if there is no babies she likely ate them which can be due to several things (cleaning up still born, diet that is not adequate, too old and not lactating etc)

When starting a feeder colony you should always get young rats (just weaned) and raise them up to optimum weight, by getting older rats you might get rats way passed their prime for breeding (the window of maximum/optimum production it not that long)



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