There are four primary sources of protein in our foods: chicken, fish, pork and egg, as well as a secondary source, whole oat groats. (drtims.com)
Ingredients to Look For Chicken and poultry byproduct meal, meat meal, whole eggs, liver, poultry or animal byproducts are all excellent primary sources of protein for ferrets. (smallanimalchanel.com)
We also suggest you look for foods with less - common primary sources of protein, like venison, bison or duck. (puppywire.com)