Table 1. Proximate analysis of commercial diets differing in PGR¹.

Component	HighPGR2	MediumPGR3	LowPGR4
Moisture, %	7.16	6.76	5.31
Ash, %	6.36	6.31	6.38
Crude protein5, %	38.02	35.86	42.06
Crude fat, %	10.83	20.02	20.42
Nitrogen-free extract, %	34.1	29.5	23.6
Starch, %	36.75	30.72	23.56
Crude fiber, %	1.17	1.78	2.58

¹Adapted from Asaro et al. [4] (S1 Table).

²Purina ONE Chicken and Rice (Nestlé, St. Louis, MO) containing as main ingredients: chicken, brewer’s rice, corn gluten meal, poultry by-product meal, wheat flour, animal fat preserved with mixed-tocopherols, whole grain corn, soy protein isolate, fish meal, animal liver flavor, KCl, H3PO4, CaCO3, caramel color, choline chloride, and salt.

³Iams Kitten Proactive Health (Procter & Gamble, Cincinatti, OH) containing as main ingredients: chicken, chicken by-product meal, corn meal, chicken fat preserved with mixed tocopherols, dried beet pulp, ground whole grain sorghum, dried egg product, natural flavor, fish oil preserved with mixed tocopherols, KCl, fructooligosaccharides, choline chloride, CaCO3, brewer’s dried yeast, DL-Met, and salt.

⁴Innova (Procter & Gamble, Cincinatti, OH) containing as main ingredients: turkey, chicken, chicken meal, whole grain barley and whole grain brown rice, chicken fat preserved with mixed tocopherols, peas, natural flavors, apples, herring, flaxseed, eggs, blueberries, pumpkin, tomatoes, sunflower oil, KCl, DL-Met, carrots, pears, cranberries, menhaden oil, cottage cheese, taurine, green beans, alfalfa sprouts, parsnips, and salt.

⁵Percentage of N × 6.25