Measurement and Application of Purine Derivatives:Creatinine Ratio in Spot Urine Samples of Ruminants

The daily excretion of purine derivatives in urine has been used to estimate the supply of microbial protein to ruminant animals. The method provides a simple and non-invasive tool to indicate the nutritional status of farm animals. However due to the need for complete collection of urine the potential application at farm level is restricted.