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Effect of level of feed intake on the excretion of purine derivatives and purine derivatives to creatinine ratio in the urine of sheep |
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Y. K. Han, H. T. Shin, J. Landis |
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| Abstract |
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Urinary purine derivatives and creatinine excretion was measured in a total of 4 white Alpine sheep. They were given diets 718 to 1060 g/kg dry matter (DM) of roughage. The crude protein content of this diets was on average 93.87 5.57g in kg DM. Purine derivatives-N excretion increased linearly with incremental DM intake and was significantly correlated (n = 16) with amounts of digestible organic matter (DOM) intake: allantoin-N (mg) = 1.205 ( 0.070) 횞 DOM (g) - 136.709 ( 37.399), r = 0.9770, RSD = 22.97; uricacid-N (mg) = 1.205 ( 0.070) 횞 DOM (g) + 11.380 ( 21.881), r = 0.6306, RSD = 13.44; Hypoxanthine-N (mg) = 0.049 ( 0.014) 횞 DOM (g) - 28.640 ( 7.708), r = 0.6544, RSD = 4.73; total purine derivatives-N (mg) = 1.385 ( 0.083) 횞 DOM (g) - 90.261 ( 44.552), r = 0.9706, RSD = 27.47. Microbial protein synthesis per kg DOM was estimated of 113 g. The urinary creatinine-N excretion was on average 9.10 mg/kg live weight (LW) with a standard error of 0.12 mg creatinine-N per kg LW. The excretion of creatinine excreton was not related to feed intake. Daily creatinine excretion (mg/d) was calculated from individual LW measurements and the average creatinine excretion (mg/kg LW). It was possible to predict the daily urinary purine derivatives excretion (r = 0.9720 for allantoin, r = 0.9886 for total purine derivatives) from the ratio of purine derivatives (mg/100 ml) and creatinine (mg/100 ml) in the urine and the daily creatinine excretion. |
| Keywords:
Purine Derivatives; Creatinine; Microbial Protein; Digestible Organic Matter |
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