Superovulation in cows: A review

Ovulation is release of secondary oocyte from ovary upon ovulation of grown and maturated Graafian follicle. Superovulation is the bunch of processes to have the female to produce more eggs than the normal count of its species in each estrus by gonadotropin and to increase the number of embryos. Ten or more live eggs can be collected in each estrus from appropriate superovulated cows and heifers. Approximately 5 transferrable embryos can be collected upon 85% of superovulated normal fertile donors. Usually FHS and PMSG and rarely hMG are used for superovulation of cows. LH, hCG, GnRH, estradiol 17-β, prostaglandins, Anti-PMSG, gestagens and inhibin are used as auxiliary to the superovulator hormones. 10 or more oocytes can be collected in an estrus from the cow appropriately superovulated. As the repetition frequency of superovulation increases chance for procurement of alive embryo decreases.