Please follow the below given ResearchGate link and PDF attachment for the answer to your query.

https://www.researchgate.net/publication/232065161_Fresh_embryo_transfer_versus_frozen_embryo_transfer_in_in_vitro_fertilization_cycles_A_systematic_review_and_meta-analysis

endometrial receptivity under superovulation protocol is also affected adversely and is less receptive for embryos coming from the same cycle. When the patient comes back for frozen embryos, the endometrial is not under hyperstimulation hormonal protocol and respond better to Frozen embryos or even donor fresh embryos

do you mean embryo? As zygote forms by the union of a sperm and an ovum where we check presence of two pro nuclei. The zygote develops into the embryo .

There are many advantages of frozen thawed embryo

- Lady will have one or more chances of embryo transfer

- FET [frozen embryo transfer ] is easy and useful for a lady who has elevated progesterone level at stimulation

-FET also helps women who did not develop good endometrial lining during stimulation.

-FET reduces chances of OHSS.

-FET is useful for couple undergoing PGS/PGD, as it takes longer time from genetic lab to get the report.

- FET increases chances of pregnancy as embryo transferred in natural cycle.

- Woman can grow her family at later stage if she has frozen her surplus embryos during her IVF cycle.