Without a doubt, thousands of pregnant cows and their fetuses have died so far in developing this 'cruelty-free' meat. And it is not at all clear that the end result will be viable. Read this brand new article for more information: http://gizmodo.com/behind-the-hype-of-lab-grown-meat-1797383294
For more on this, see this piece written by Earthsave Canada's president: http://www.vancouverhumanesociety.bc.ca/new-meat-alternatives-offer-great-promise/
There are wonderful - and ever improving - plant-based meat analogs already out there. We recommend that we all just go with them and their like.