A fecal test for assessing phosphorus overfeeding on dairy farms: evaluation using extensive farm data

Journal of Dairy Science
Z DouJ D Ferguson

Abstract

Managing P on dairy farms requires the assessment and monitoring of P status of the animals so that potential overfeeding may be minimized. Numerous published studies have demonstrated that for lactating dairy cows, increasing P concentrations in diets led to greater P excretion in feces. More recent work reported that inorganic P (P(i)) in 0.1% HCl extracts of feces (fecal extract P(i), g/kg) closely reflects dietary P changes. This has led to the proposal that 0.1% HCl fecal extract P(i) may serve as an indicator of the animal's P status (adequate or excessive) when compared with a benchmark value. Here, we present the results of an extensive evaluation of the proposed fecal P indicator test. With samples (n=575) from >90 farms, fecal total P (TP, g/kg) and fecal extract P were positively correlated with dietary P (X, g/kg): TP=1.92X - 0.17 (R2=0.36); fecal extract P=1.82X - 2.54 (R2=0.46). Fecal extract P was responsive to dietary P changes, whereas the remaining P, calculated as TP minus fecal extract P, was not. A provisional benchmark value of fecal extract P representing near-adequate P status was set at 4.75g/kg. Assessment of the farm data using the benchmark indicated that 316 out of 575 data points were associated wi...Continue Reading

References

Dec 16, 2003·Journal of Dairy Science·Z DouZ Wu
Aug 26, 2004·Journal of Dairy Science·W P Weiss, D J Wyatt
Nov 17, 2004·Journal of Dairy Science·L Chapuis-LardyZ Dou
Jul 14, 2007·Environmental Science & Technology·Zhengxia DouJames D Ferguson

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Citations

Nov 28, 2013·Animal : an International Journal of Animal Bioscience·M NordqvistR Spörndly
Apr 29, 2015·Journal of the Science of Food and Agriculture·Maria NordqvistKjell Holtenius

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