[ Objective] To find an efficient and low-consumption estrus synchronization method and thus to provide the basis for embryo transfer. [Method] A total of 120 healthy multiparous yellow cattle were selected as recepto...[ Objective] To find an efficient and low-consumption estrus synchronization method and thus to provide the basis for embryo transfer. [Method] A total of 120 healthy multiparous yellow cattle were selected as receptor cows for embryo transfer and assigned into three groups ran- domly （ n = 40）. To induce estrous synchronization, the cattle in the group I were injected 4 mg prostaglandin （PG） ; those in the group II were first transplanted with vaginal embolism and then injected with 4 mg PG; and those in the group III were first transplanted with vaginal embolism and then injected with 0.4 mg PG and 2.0 ml follicle-stimulating hormone （FSH）. The rate of estrous synchronization, rate of embryo transfer and rejec- tion rate were compared between different treatments. [Result] The rates of estrous synchronization of the group I, II and III were 0%, 80% and 78%, respectively, and their rates of embryo transfer were 27.5%, 60.0% and 45.0%, respectively. [ Conclusion] Transplantation with vaginal embolism followed by injection with PG and FSH is the optimum method to induce estrus synchronization in yellow cattle.展开更多
文摘[ Objective] To find an efficient and low-consumption estrus synchronization method and thus to provide the basis for embryo transfer. [Method] A total of 120 healthy multiparous yellow cattle were selected as receptor cows for embryo transfer and assigned into three groups ran- domly （ n = 40）. To induce estrous synchronization, the cattle in the group I were injected 4 mg prostaglandin （PG） ; those in the group II were first transplanted with vaginal embolism and then injected with 4 mg PG; and those in the group III were first transplanted with vaginal embolism and then injected with 0.4 mg PG and 2.0 ml follicle-stimulating hormone （FSH）. The rate of estrous synchronization, rate of embryo transfer and rejec- tion rate were compared between different treatments. [Result] The rates of estrous synchronization of the group I, II and III were 0%, 80% and 78%, respectively, and their rates of embryo transfer were 27.5%, 60.0% and 45.0%, respectively. [ Conclusion] Transplantation with vaginal embolism followed by injection with PG and FSH is the optimum method to induce estrus synchronization in yellow cattle.
