. 2020 Jun 6;66(5):427–433. doi: 10.1262/jrd.2020-059

Table 7. Success rates of Second-oocyte collection by cutting the position at the First-oocyte collection.

Cutting position	No. of oviducts	No. (%) * of oviducts contained COCs	No. (average) of normal oocytes collected *
Control	12	12 (100) ^a	199 (16.6) ^a
Front	17	13 (76.5) ^a	230 (13.5) ^a
Middle	13	4 (30.8) ^b	66 (5.1) ^b
Rear	40	10 (25.0) ^b	190 (4.8) ^b

COCs: Cumulus oocytes complexes. Total 41 mice were used in this experiment. For some mice, the ampulla was cut at different positions in the same individual.* Different letters indicate significant differences by Pearson’s Chi-square test (P < 0.01). ** Different letters indicate significant differences by t-test (P < 0.01). *** Number of oocytes collected per an oviduct.