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Oocyte loss during meiosis [15].
| Species | Maximum number of oocytes | Number of oocytes at birth | Oocyte loss (%) |
|---|---|---|---|
| Murine | 50,000–75,000 | 10,000–15,000 | 80 |
| Ovine | 900,000 | 82,000 | 91 |
| Porcine | 1,200,000 | 500,000 | 58 |
| Bovine | 2,700,000 | 135,000 | 95 |
| Human | 7,000,000 | 700,000 | 90 |
