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Author Dorea, J.R.R.; Danes, M.A.C.; Zanton, G.I.; Armentano, L.E. url  doi
  Title Urinary purine derivatives as a tool to estimate dry matter intake in cattle: A meta-analysis Type Journal Article
  Year 2017 Publication Journal of Dairy Science Abbreviated Journal J Dairy Sci  
  Volume 100 Issue 11 Pages 8977-8994  
  Keywords Cattle; Beef; Dairy; DMI; Nutirition  
  Abstract The objectives of this study were to investigate the relationship between dry matter intake (DMI) and urinary purine derivative (PD) excretion, to develop equations to predict DMI and to determine the endogenous excretion of PD for beef and dairy cattle using a meta-analytical approach. To develop the models, 62 published studies for both dairy (45 studies) and beef cattle (17 studies) were compiled. Twenty models were tested using DMI (kg/d) and digestible DMI (dDMI, kg/d) as response variables and PD:creatinine (linear term: PD:C, and quadratic term: PD:C2), allantoin:creatinine (linear term: ALLA:C, and quadratic term: ALLA:C2), metabolic body weight (BW0.75, kg), milk yield (MY, kg/d), and their combination as explanatory variables for dairy and beef (except for MY) cattle. The models developed to predict DMI for dairy cattle were validated using an independent data set from 2 research trials carried out at the University of Wisconsin (trial 1: n = 45; trial 2: n = 50). A second set of models was developed to estimate the endogenous PD excretion. In all evaluated models, the effect of PD (either as PD:C or ALLA:C) was significant, supporting our hypothesis that PD are in fact correlated with DMI. Despite the BW-independent relationship between PD and DMI, the inclusion of BW0.75 in the models with PD:C and ALLA:C as predictors slightly decreased the values of root mean square error (RMSE) and Akaike information criterion for the models of DMI. Our models suggest that both DMI and dDMI can be equally well predicted by PD-related variables; however, predicting DMI seems more useful from a practical and experimental standpoint. The inclusion of MY into the dairy models substantially decreased RMSE and Akaike information criterion values, and further increased the precision of the equations. The model including PD:C, BW0.75, and MY presented greater concordance correlation coefficient (0.93 and 0.63 for trials 1 and 2, respectively) and lower RMSE of prediction (1.90 and 3.35 kg/d for trials 1 and 2, respectively) when tested in the validation data set, emerging as a potentially useful estimator of nutrient intake in dairy cows. Endogenous PD excretion was estimated by the intercept of the linear regression between DMI (g/kg of BW0.75) and PD excretion (mmol/kg of BW0.75) for beef (0.404 mmol/kg of BW0.75) and dairy cattle (0.651 mmol/kg of BW0.75). Based on the very close agreement between our results for beef cattle and the literature, the linear regression appears to be an adequate method to estimate endogenous PD excretion.  
  Address Department of Dairy Science, University of Wisconsin, Madison 53706. Department of Animal Science, University of Lavras, Lavras, Minas Gerais, 37200-000, Brazil. US Dairy Forage Research Center, 1925 Linden Drive West, Madison, WI 53706. Department of Dairy Science, University of Wisconsin, Madison 53706. Electronic address:  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition 2017/09/04  
  ISSN 1525-3198 (Electronic) 0022-0302 (Linking) ISBN Medium  
  Area (up) Expedition Conference  
  Notes Web of Science, Scielo, and Scopus searched Approved yes  
  Call Number UoN @ rachel.dean @ 1464 Serial 2919  
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