Our cat blends are based off an 84/6/10 ratio. most cats tend to do better on a lower bone content to prevent any constipation issues. the cat blends are sent through the grinding process a few times to make sure any bone is an appropriate size and to insure we get the consistency that cats tend to like better. We do not add anything synthetic to the food, all meat contains taurine so there should be no issue for healthy cats. if your cat requires a higher taurine amount, then we recommend using Nuvet cat formula ( please contact us to order).