@article{fdi:010049268,
  title = {{A} fecal test for assessing phosphorus overfeeding on dairy farms : evaluation using extensive farm data},
  author = {{D}ou, {Z}. and {R}amberg, {C}. {F}. and {C}hapuis {L}ardy, {L}ydie and {T}oth, {J}. {D}. and {W}u, {Z}. and {C}hase, {L}. {E}. and {K}ohn, {R}. {A}. and {K}nowlton, {K}. {F}. and {F}erguson, {J}. {D}.},
  editor = {},
  language = {{ENG}},
  abstract = {{M}anaging {P} on dairy farms requires the assessment and monitoring of {P} status of the animals so that potential overfeeding may be minimized. {N}umerous published studies have demonstrated that for lactating dairy cows, increasing {P} concentrations in diets led to greater {P} excretion in feces. {M}ore recent work reported that inorganic {P} ({P}-i) in 0.1% {HC}l extracts of feces (fecal extract {P}-i, g/kg) closely reflects dietary {P} changes. {T}his has led to the proposal that 0.1% {HC}l fecal extract {P}-i may serve as an indicator of the animal's {P} status (adequate or excessive) when compared with a benchmark value. {H}ere, we present the results of an extensive evaluation of the proposed fecal {P} indicator test. {W}ith 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} = 1.92{X} - 0.17 ({R}-2 = 0.36); fecal extract {P} = 1.82{X} - 2.54 ({R}-2 = 0.46). {F}ecal 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 4.75 g/kg. {A}ssessment of the farm data using the benchmark indicated that 316 out of 575 data points were associated with possible {P} overfeeding. {A}dvantages of the fecal-based test over feed-based analysis to assess {P} status are discussed. {T}he fecal extract {P} method is a simple and practical test that can be used as an assessment tool for helping dairy producers improve {P} management and reduce their environmental footprint.},
  keywords = {fecal {P} test ; {P} overfeeding ; dairy farm ; assessment},
  booktitle = {},
  journal = {{J}ournal of {D}airy {S}cience},
  volume = {93},
  numero = {2},
  pages = {830--839},
  ISSN = {0022-0302},
  year = {2010},
  DOI = {10.3168/jds.2009-2153},
  URL = {https://www.documentation.ird.fr/hor/fdi:010049268},
}