Many say there is a risk in breeding an older rat for the first time. In the wild, rats would typically breed much earlier, and die much earlier. I cannot say one way or the other whether it would be safe to breed your rat, seeing as she is over 1 year old. Her health sounds good, so I'm sure she is strong enough to handle it, but again, it is the belief of many people that breeding an older rat for the first time, means they are not as resilient and able to cope with the bodily stress like a younger rat would be.
So take these things into consideration when you make a decision.
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