At Chiron three seed strains are injected separately into fertilized eggs chosen under strict rules.

FORBES: Broken Eggs

And even then, amidst all this chaos, only one in a million fertilized eggs make it to adulthood.

FORBES: Oysters Are Back In New York City Waters

But creating a stem cell requires destroying embryos when they are five-day-old balls of a hundred cells, such as fertilized eggs discarded after an in vitro fertilization.

FORBES: Magazine Article

Research based largely on data from their homeland has indicated the carp can spawn successfully only under the right circumstances, including temperatures of about 70 degrees and long stretches of continuously flowing water where fertilized eggs can drift while incubating.

WSJ: Asian carp spawning areas wider than expected

Scientists drained some fish of their sperm or eggs, which were later fertilized to create hatchlings to reintroduce or support the fish in other parts of their ancient range in the Great Lakes, Hudson Bay and Mississippi basins.

WSJ: Standing Guard for the Sturgeon

If your eggs are getting thawed out and fertilized in vitro, why not be certain you are getting just the child you want by choosing its sex or making sure she isn't genetically predisposed to, say, depression or cancer?

WSJ: The Ethics of Egg Freezing

Using eggs from the same donor so that the offspring would be kin, doctors fertilized them with the respective sperm of the two men and implanted the embryos in two separate surrogates.

WSJ: Hiring A Surrogate In India