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Table 1 Ingredient and chemical composition of casein- and whey-based diets (as-fed basis)

From: Phenylalanine flux and gastric emptying are not affected by replacement of casein with whey protein in the diet of adult cats consuming frequent small meals

Ingredients (%) Casein Whey
Yellow corn 37.2 35.2
Casein 20.0 0
Whey 0 21.6
Chicken Fat 9.7 9.1
Corn gluten meal 6.1 6.2
Chicken by-product meal 10.7 10.7
Chicken 5.0 5.0
Beet Pulp 2.4 2.4
Chicken digest 1.4 1.4
Dicalcium phosphate 1.04 1.05
Corn grits 0.95 0.96
Brewer’s rice 0.94 0.96
Egg 0.81 0.82
Brewer’s yeast 0.76 0.77
Sodium bisulphate 0.76 0.77
Potassium chloride 0.64 0.65
Calcium carbonate 0.64 0.65
Sodium chloride 0 0.48
Mineral Premix1 0.42 0.42
Choline chloride 0.20 0.21
Fish oil 0.20 0.20
DL-methionine 0.12 0.12
Vitamin Premix2 0.09 0.09
Analyzed nutrient contents (as fed)   
Metabolizable energy (MJ/kg)3 15.5 16.1
Dry Matter 81.3 82.6
Fat 15.4 17.1
Crude Fiber 1.5 1.2
Ash 6.2 6.2
N-free extract 34.5 34.0
Crude Protein 33.7 34.0
Arginine 1.67 1.80
Histidine 0.76 0.62
Isoleucine 1.39 1.50
Leucine 3.34 3.41
Lysine 2.02 2.07
Methionine 0.97 1.00
Phenylalanine 1.54 1.15
Tryptophan 0.46 0.58
Tyrosine 1.33 0.95
Valine 1.74 1.72
  1. 1Mineral Premix contained: 40.4% Potassium, 38.1% Chloride, 3 500 ppm Copper, 16 120 ppm Manganese, 60 000 Zinc, 420 ppm Iodine, 150 ppm Cobalt.
  2. 2Vitamin Premix contained: 36 300 K IU/kg Vitamin A, 1 725 000 IU/kg Vitamin D3, 148 650 IU/kg Vitamin E, 22 575 ppm Thiamine, 89 130 ppm Niacin, 19 200 ppm Pyridoxine, 25 935 ppm Pantothenic acid, 2430 ppm Folic acid, 189 ppm Vitamin B12, 5520 ppm Inositol, 54 000 ppm Vitamin C, 540 ppm Biotin, 5940 ppm Riboflavin.
  3. 3Calculated by using modified Atwater coefficients (1).