@article{PAR00001702,
  title = {{A} novel test for measuring and managing potential phosphorus loss from dairy cattle feces},
  author = {{D}ou, {Z}. {X}. and {R}amberg, {C}. {F}. and {C}hapuis {L}ardy, {L}ydie and {T}oth, {J}. {D}. and {W}ang, {Y}. and {M}unson, {R}. {J}. and {W}u, {Z}. {G}. and {C}hase, {L}. {E}. and {K}ohn, {R}. {A}. and {K}nowlton, {K}. {F}. and {F}erguson, {J}. {D}.},
  editor = {},
  language = {{ENG}},
  abstract = {{P}ollution of waters resulting from phosphorus ({P}) runoff from agricultural land receiving long-term manure application is one of the most serious threats to water quality in many regions of the world. {O}f various approaches to alleviate the problem, reducing {P} surplus on animal farms through optimizing {P} intake and minimizing {P} excretion in manure offers a great opportunity. {H}ere, we present a fecal {P} test method that has the potential to identify over-feeding of {P} in dairy cattle. {P}revious research has suggested that water-extractable {P} in dairy cow feces closely reflects dietary {P} changes and may indicate the animal's {P} status (adequate vs excessive). {H}owever, the notion was somewhat confounded when a subsequent study found other factors (p{H} and {C}a content as well as sample handling method) also affecting {P} extractability in water. {I}n the present work, we hypothesize that the impact of those factors on {P} extractability can be overcome by selecting dilute acid solutions to replace deionized water as the extractant. {U}sing samples from 25 commercial dairy farms, we tested an array of acid solutions (including {HC}l, citric acid, and acetic acid) and found that 0.1% {HC}l is the most suitable extractant. {I}norganic {P} ({P}-i) released in 0.1% {HC}l closely reflected dietary {P} changes among the farms ({R}-2 = 0.69) and was independent of p{H}, {C}a, or sample handling method. {K}nowledge of {P} metabolism and partitioning in dairy cows and our experimental data suggest that excess {P} intake by the animal leads to greater amounts of bioavailable but unabsorbed {P}, which is excreted in feces. {I}ts relative magnitude may be estimated by measuring {P}-i extractable in 0.1% {HC}l. {T}his novel and simple fecal {P} test could potentially be used as an indicator of the animal's {P} supply utilization status and thus serve as a screening tool for the presence of {P} over-feeding on dairy farms.},
  keywords = {},
  booktitle = {},
  journal = {{E}nvironmental {S}cience and {T}echnology},
  volume = {41},
  numero = {12},
  pages = {4361--4366},
  ISSN = {0013-936{X}},
  year = {2007},
  DOI = {10.1021/es063029x},
  URL = {https://www.documentation.ird.fr/hor/{PAR}00001702},
}