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Many animals have a conserved adaptive genome defence system known as the Piwi-interacting RNA (piRNA) pathway, which is essential for germ cell development and function. Disruption of individual mouse Piwi genes results in male but not female sterility, leading to the assumption that PIWI genes play little or no role in mammalian oocytes. Here, we report the generation of PIWI-defective golden hamsters, which have defects in the production of functional oocytes. The mechanisms involved vary among the hamster PIWI genes, whereby the lack