Here I am giving the list of some historical events related to Reproduction.
Leeuwenhoek
1677 – Leeuwenhoek first saw spermatozoa under a microscope.
1780– Spallanzani produced four pups of the dog by injecting solid of semen in the uterus of dog. He was the first who reported the effects of cooling on sperm.
1897 – Heap, England AI (artificial insemination) in Rabbit.
1930 – AI (artificial insemination) in cattle, sheep, pig and horse.
1933 – AI (artificial insemination) corporation of Denmark.
1937 – AI corporation of USA.
1939–40 – AI in cattle, in Europe was 90% and in the USA 60%.
1949 – Use of glycerol for cryopreservation.
1950 – Use solid carbon dioxide at -60°, liquid nitrogen -196° C.
1960 – Boosting fertility of frozen semen by addition of a special protein.
1971 – Embryo transfer.
1980 – Control of estrus.
1998 – Microinjection of the ovum.
1999 – Sexing of semen.
2000 – Fixed-time AI (synchronization).