K A S H R U T . C O M_©

July 11, 2017 from the Slate.com:

Currently all lab-grown meat uses fetal bovine serum.Fetal bovine serum "is a byproduct made from the blood of cow fetuses. If a cow coming for slaughter happens to be pregnant, the cow is slaughtered and bled, and then the fetus is removed from its mother and brought into a blood collection room. The fetus, which remains alive during the following process to ensure blood quality, has a needle inserted into its heart. Its blood is then drained until the fetus dies, a death that usually takes about five minutes. This blood is then refined, and the resulting extract is FBS."
"Cultured meat grown in a lab is made from bovine cells that grow in a petri dish to ultimately produce a substance that is meatlike enough to market as a burger." FBS contains growth factors and is a useful way to grow cells cultures ang growing cultured meat. Using it also defeats the purpose of creating cultured meat.