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Generally, laboratory mice become sexually mature between fi ve and eight weeks of age. Males of most. strains usually mature sexually by six weeks of age. DBA/2J (000671) and C3H/HeJ (000659) mice are precocious: females can. conceive when they are as young as 23 days old.
Gestation. Felines hit puberty and begin mating at about the age of 6 months. A cat's gestation period last approximately 63 days, so if you bred your cat or know when she got out of the house and probably mated you can expect kittens to arrive two months later.The gestation period for Siamese cats is a few days longer.elines hit puberty and begin mating at about the age of 6 months. A cat's gestation period last approximately 63 days, so if you bred your cat or know when she got out of the house and probably mated you can expect kittens to arrive two months later.