Szukana fraza: [Opis = "Reproduction of females of pine voles Pitymys subterraneus \(de SélysLongschamps, 1836\) has been tested under constant laboratory conditions. Mated 37 days old females have given litter. The duration of pregnancy in primiparous females has been 22.9 days \(from 21 to 25 days\). Litter size has ranged from 1 to 5 with a made of 2.47 young born per litter."]

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