To give you an idea I retire males (they work hard) every 6 months and females when the production drops below 8 to 10
You can put a younger male with her see if she produces more or you can put another female with that male.
It's important to retire and start rotating new breeders on a regular basis, breeding takes it's toll on them, and of course ALWAYS hold back future breeders from your largest litters (My hold backs are from litters of 14 min)
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