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Three experiments were conducted to evaluate the use of purine derivatives (PD)/creatinine ratio in spot urine samples as an index of microbial protein supply in Yerli Kara crossbred cattle (YK-C). In Experiment I, response of daily PD excretion to feed intake in YK-C at state farm was measured. In Experiment II, spot urine sampling techniques was applied at state farm and four YK-C bulls were used...
The present study compares estimates of rumen microbial nitrogen (MN) production derived from duodenal flow measurements with those obtained from urinary purine derivatives (PD) excretion. Four crossbred Holstein-Friesian heifers (initial weight 306+/-6.0kg) fitted with rumen and duodenal cannulae were randomly allocated in a double 2x2-crossover design to one of two experimental diets. Both diets...
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