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Assessment of Endogenous Nitrogen Output in Adult Dogs of Contrasting Size Using a Protein-Free Diet

Animal Studies Centre, Freeby Lane, Waltham-on-the-Wolds, Leicestershire, U.K.

The purpose of the work was to assess endogenous nitrogen output in dogs of widely contrasting mature body size and genotype. Fecal and urinary nitrogen excretion was measured during 14-day metabolic periods in 25 adult dogs of body-weight range 2.8-51.0 kg fed a protein-free, semipurified diet. Endogenous nitrogen excretion was assumed from day 8 after introduction of the protein-free diet and was measured during the final 7 days of each period. Mean (±SEM) endogenous urinary nitrogen (EUN), metabolic fecal nitrogen (MFN), and total endogenous nitrogen (TEN) outputs were 210 ± 9.63 ± 3 and 273 ± 9 mg/kg^0.75 per day. There were no significant effects of either sex or body weight on the magnitude of EUN, MFN or TEN outputs, however, EUN output was positively and significantly (P < 0.02) correlated (r = 0.50) with percentage body-weight loss during the metabolic period. The mean values obtained for endogenous nitrogen output in adult dogs agreed closely with previous estimates in the literature for dogs exhibiting a narrower range (8.3–16.7 kg) of mature body weight.

KEY WORDS: • endogenous nitrogen output • adult dogs • proteinfree diet

Manuscript received 18 January 1982.