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Male guinea-pigs can start mating when they are as young as 3 weeks old, although it is recommended that you make sure they been bred by six months old to make them a breeder.
Female guinea pigs can start having babies when they are three months old, however, it is highlyrecommended that you don't mate them when they are over a year old, due to pelvis bone fusion. A female guinea pig any older than a year old will have a dead litter before she will be able to produce a live litter.

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7y ago

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