Jan 27, 2022 · 18 to 20% protein; 16% protein if heritage or pastured. As a general guide, take a closer look at the ingredients list and nutritional content in commercial poultry feed to get an idea of what percentages to aim for. You will need to balance all the macronutrients (fats, carbohydrates, and protein) and micronutrients (vitamins and enzymes).