Abstract
Abstract Osuji, P.O., Nsahlai I.V. and Khalili, H. 1996. Effect of fasting on the urinary excretion of nitrogen and purine derivatives by zebu (Bos indicus) and crossbred (Bos indicus x Bos taurus) cattle. J. Appl. Anim. Res., 10: 39–47. Six cattle [3 Boran (Bos indicus) and 3 crossbred (Bos indicus x Bos taurus)] were fasted for 20 days to estimate the effect of fasting on the excretion of nitrogen (N) and purine derivatives (PD) in the urine. PD excretion (y) for each genotype was related to time (t in days) by means of an exponential model: F=A+Be−kt where A is the endogenous excretion, k the fractional rate of excretion of exogenous PD B. The equations relating y to time (t) were: y = 0.172+0.178e−0.392t, R2 = 0.86; and y = 0.108 + 0.146e−0.108t R2 = 0.61 for the zebu and crossbred cattle, respectively. The daily fasting urinary nitrogen (N g/kg W0.75) was related to total daily PD excretion (y mmol/kg W0.75) by the equations: y = 0.00294 + 0.7285 ± 0.136 N, Adj R2 = 0.75 (crosses) y = 0.01099 + 0.922...
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