title: Urinary energy losses in dogs fed commercial extruded foods.
abstract: Energy and nitrogen losses in the urine were recorded in 134 individual balances with adult (1- to 2-year-old) female Beagles that were fed 23 dry extruded dog foods ranging in crude protein (CP) content from 242 to 360 g/kg dry matter. The energy equivalent of urinary nitrogen was estimated as 33.9 kJ/g N. Both energy losses in the urine corrected for the nitrogen balance, and the metabolizable energy (MEn): digestible energy (DE) ratio were found to be closely related to diet CP content (r : 0.851 and 0.820). The MEn content of extruded dog foods can be accurately calculated from the DE content, either by subtracting 4.59 MJ/kg CP or estimating the MEn/DE ratio from the food CP content by the following equation: MEn/DE=0.98 - 3.44 +/- 0.517 x CP (kg/MJ DE).
authors.affiliation: Departamento de Producción Animal y Ciencia de los Alimentos, Facultad de Veterinaria, Universidad de Zaragoza, Zaragoza, Spain. ccastri@posta.unizar.es
authors.forename: C
authors.initials: C
authors.lastname: Castrillo
authors.forename: F
authors.initials: F
authors.lastname: Vicente
authors.forename: J A
authors.initials: JA
authors.lastname: Guada
mesh_terms: D000821:Animal Feed / Q000032:analysis*; D000818:Animals; D004063:Digestion; D004285:Dogs / Q000378:metabolism / Q000652:urine*; D004734:Energy Metabolism; D005243:Feces / Q000737:chemistry; D005260:Female; D008433:Mathematics; D009584:Nitrogen / Q000378:metabolism*; D016482:Urinalysis / Q000662:veterinary
chemical_list: D009584:Nitrogen