It's the same amino acids, lipids and micronutrients that you'd find in regular meat. You just need to keep all the nasty bacteria that love to live in the cow's intestine out of it, and make sure that the cow isn't sick (it'll show up in the raw materials).
It's no different from taking your own urine, boiling it, filtering it, and then drinking the left over water. Think of it as pulling out the good stuff, and you'll realize that it's recycling, not eating actual feces. To elaborate, imagine that you are a Nutrient Bender; you have the power to move any nutrient telekinetically. If you lifted the good stuff out of a turd, it wouldn't actually look bad at all. It would be the same thing that you'd find in a steak. Furthermore, you're still eating what used to be feces when you eat 'real' meat because of decomposers.
If you really want to get freaky, you are eating the cooled remains of highly radioactive fusion explosions. Now put
that in your reactor and melt it.
You guys need to relax, real meat is just as dangerous if mishandled. If properly done, meat made from the nutrients extracted from feces would be no different from meat grown on animals. It's just recycling, and it allows us to reuse things that would usually be lost as waste. This isn't some hippie's dream, this is a great step forward in creating a sustainable food supply.
Rock on Doctor Mitsuyuki, your work will not be appreciated for a long, long time.

-Penguin