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As many times as 30 Comment For the above to be true; 365/30 = 12.1 (1d.p.) days gestation. There are some marsupials with gestation periods this short, Didelphis marsupialis, Dasyurus viverrinus and Chironectes minimus. Answer For Rattus norvegicus gestation is on average 22 days and oestrus follows within 48 hour of partuition. This gives an cycle length of 24 days. 365/24 = 15.2(1d.p.) so in theory 15 litters per year is possible. In reality gestation is prolonged when the female is simultaniously lactating and pregnant so the number is probably closer to 14. The average litter size is between 6 and 12, so one female could in theory produce around 200 pups per year!

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16y ago

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