Table 1 Treatments and experimental design

Wild-type group (n = 12)

Receive no treatment after HCG injection

The oviducts and blood from the abdominal aorta of six rabbits in each group were sampled on experimental day 36

Six remaining rabbits in each group were injected with 80 IU HCG and paired with male rabbits for 30 days

Vein + local untreated control group (n = 12)

Ear vein and urogenital tract were instilled by normal saline, respectively, on experimental day 15, once per week for 3 weeks

Local untreated control group (n = 12)

Urogenital tract was instilled by normal saline on experimental day 15, once per week for 3 weeks

Vein + local treatment group (n = 12)

Ear vein and urogenital tract were instilled by 0.5 ml of a 1 × 10⁶/ml WJMSC suspension, respectively, on experimental day 15, once per week for 3 weeks

Local treatment group (n = 12)

Urogenital tract was instilled by 1.0 ml of a 1 × 10⁶/ml WJMSC suspension on experimental day 15, once per week for 3 weeks