From: Amino acid nutrition and metabolism in domestic cats and dogs
Variable | Diets containing different levels of protein | |||
---|---|---|---|---|
Low protein | Adequate protein | Moderate protein | High protein | |
Body weight, kg | 3.84 | 3.99 | 4.2 | 4.17 |
Dietary energy and nutrient content and food intake | ||||
 Protein content, % (as-fed basis) | 9.1 | 17.2 | 32.7 | 59.6 |
 Protein content, % of metabolizable energy | 7.5 | 14.2 | 27.1 | 49.6 |
 Fat content, % (as-fed basis) | 20.9 | 21.0 | 20.9 | 20.9 |
 Carbohydrate, % (as-fed basis) | 65.1 | 57.0 | 41.0 | 13.5 |
 Metabolizable energy, MJ/kg dry matter | 20.3 | 20.3 | 20.2 | 20.1 |
 Food intake, g dry matter/d | 41.5 | 58.5 | 54.0 | 57.8 |
Nitrogen intake, excretion, and balance | ||||
 Nitrogen intake, g/d | 0.60 | 1.61 | 2.82 | 5.52 |
 Total urinary nitrogen, g/d | 0.76 | 1.16 | 2.29 | 4.58 |
 Urinary ammonia nitrogen, mg/d | 117 | 152 | 157 | 198 |
 Urinary creatinine nitrogen, mg/d | 48.7 | 47.1 | 56.5 | 54.5 |
 Fecal nitrogen, g/d | 0.09 | 0.12 | 0.15 | 0.17 |
 Nitrogen balance, g/d | −0.25 | 0.33 | 0.39 | 0.76 |
Dietary intake and the oxidation of nutrients | ||||
 Protein intake, g/d | 3.8 | 10.0 | 17.6 | 34.5 |
 Protein oxidation, g/d | 5.7 | 8.6 | 17.1 | 34.6 |
 Fat intake, g/d | 8.7 | 12.3 | 11.3 | 12.1 |
 Fat oxidation, g/d | 12.1 | 10.7 | 13.9 | 9.5 |
 Carbohydrate intake, g/d | 27.1 | 33.3 | 22.2 | 7.8 |
 Carbohydrate oxidation, g/d | 21.6 | 27.1 | 20.3 | 9.2 |
Concentrations of amino acids in plasma | ||||
 Total amino acids, μmol/L | 1827 | 2579 | 4461 | 5363 |
 Leucine + Isoleucine + Valine, μmol/L | 154 | 221 | 564 | 1286 |
Urinary excretion of amino acids | ||||
 EAAs (excluding taurine) and NEAAs, μmol/d | 418 | 563 | 458 | 527 |
 EAAs/NEAAs, mol/mol | 5.4 | 5.7 | 2.6 | 1.7 |
 Felinineb, μmol/d | 388 | 458 | 1009 | 919 |