Feed conversion ratio is the wrong metric since you're forgetting about the energy required to grow the feed and transport it. The proper metric would be Joules

Feed conversion ratio is the wrong metric since you're forgetting about the energy required to grow the feed and transport it. The proper metric would be Joules in per gram of chicken out. Since the lab grown chicken doesn't need bones or organs, there is already an efficiency gain there. You also don't don't need to maintain a chicken for months since this burger only takes a few days to grow. Real chickens are currently more efficient, but that won't last forever as lab technology improves. Ideally, you just need a vertical farm that takes in electricity, organic feedstock, and some minerals and you should be able to get a better energy to meat conversion than an inefficient chicken that was cobbled together by blind luck.