Abstract:

Abstract: Objective of superovulation was to get more quantity and high quality embryos from individual donors, which produced out more excellent offspring cattle by embryo transfer technique and conservation more heredity resource of choiceness cattle and rare bovine breed by embryo frozen. Mostly factors such as exogenous hormone, donor status, number of superovulation and recovery embryos, superovulation season, environment, technique and so on, which affect the effect of superovulation were discussed. And mainly methods and effect of cattle superovulation of native and international were introduced in the paper.