Table 1. Number of ovulated oocytes from various ages of C57BL/6J mice.
| Age (weeks) | No. females | No. ovulated females | Total no. oocytes (Mean ± MSE) |
No. normal oocytes at 6 h PI (% ± MSE) a |
No. abnormal oocytes |
|||
|---|---|---|---|---|---|---|---|---|
| Total | Fragmentation (% b) | Small size (% b) | Other abnormality (% b) | |||||
| 3 | 15 | 12 | 358 (30 cd ± 6) | 353 (99 c ± 1) | 5 | 1 (20) | 3 (60) | 1 (20) |
| 4 | 15 | 13 | 403 (31 c ± 3) | 324 (82 d ± 5) | 79 | 63 (80) | 16 (20) | 0 (0) |
| 5 | 15 | 13 | 285 (22 de ± 2) | 207 (76 de ± 5) | 78 | 55 (71) | 23 (29) | 0 (0) |
| 6 | 15 | 15 | 301 (20 e ± 2) | 207 (72 e ± 4) | 94 | 45 (51) | 38 (40) | 8 (9) |
| 8 | 15 | 15 | 318 (21 e ± 2) | 221 (70 e ± 4) | 97 | 77 (79) | 20 (21) | 0 (0) |
| 10 | 15 | 14 | 337 (24 cde ± 3) | 292 (86 d ± 2) | 45 | 14 (31) | 31 (69) | 0 (0) |
a Percentage and mean standard error (MSE) of total oocytes ovulated. b Percentages of total abnormal oocytes. c–e Numbers or percentages with different superscripts in the same column were significantly different (P < 0.05).