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During the first year of life of the Xenopus laevis female, a large stock of previtellogenic oocytes (about 250 000) is built up in the ovaries ; these cells have a low growth rate and metabolic activity. A quantitative analysis of the developing ovary showed that the first vitellogenic wave occurred in two succesive phases with very different activities. In the adult, these vitellogenic oocytes represented the equivalent of four clutches. Shortly after laying, a new population of rapidly growing synchronous oocytes

annales de biologie animale biochimie biophysique

Early onset of a large pool of previtellogenic oocytes and cyclic escape by vitellogenesis : the pattern of ovarian activity of Xenopus laevis females and its physiological consequences