{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,5]],"date-time":"2026-10-05T12:51:26Z","timestamp":1791204686123,"version":"4.2.0"},"reference-count":61,"publisher":"Wiley","issue":"3","license":[{"start":{"date-parts":[[2008,5,1]],"date-time":"2008-05-01T00:00:00Z","timestamp":1209600000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"funder":[{"DOI":"10.13039\/100000199","name":"U.S. Department of Agriculture","doi-asserted-by":"publisher","award":["2001\u201052103\u201011334"],"award-info":[{"award-number":["2001\u201052103\u201011334"]}],"id":[{"id":"10.13039\/100000199","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["acsess.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["J of Env Quality"],"published-print":{"date-parts":[[2008,5]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>An experiment was conducted to examine how potential phosphorus (P) bioavailability (inferred from speciation) differs in feed and feces collected in spring from four dairy herds representing different management systems: (i) total confinement with cows fed total mixed ration (TMR), (ii) total confinement with TMR plus P mineral supplement, (iii) a hybrid of confinement with TMR and pastoral grazing, and (iv) predominantly grazing with supplemental grains. A treatment was included that air dried feces to simulate conditions after dung deposition. Wet chemical techniques and solution <jats:sup>31<\/jats:sup>P nuclear magnetic resonance spectroscopy (<jats:sup>31<\/jats:sup>P\u2010NMR) were used to identify P concentrations and compounds present in water (a surrogate for P in overland flow), dilute acid (0.012 <jats:italic>M<\/jats:italic> HCl, an estimate of P utilization by cattle), or NaOH\u2010EDTA (a solution that maximizes the organic P extraction) extracts of feed and feces. In general, P concentration in feces paralleled P in feed. Air drying feces decreased water\u2010extractable P by 13 to 61% largely due to a decrease in orthophosphate, whereas NaOH\u2010EDTA\u2013extractable P increased by 18 to 48%. Analysis of dilute HCl was unsuccessful due to orthophosphate precipitation when pH was adjusted to 12 for <jats:sup>31<\/jats:sup>P\u2010NMR. In water extracts, more P was in bioavailable diester\u2010P forms, undetectable by colorimetry, than in NaOH\u2010EDTA extracts. In feed, orthophosphate dominated (46\u201370%), but myo\u2010IHP varied with feed (&lt;10% in forage samples but 43% in a TMR sample). The proportion of myo\u2010IHP decreased in feces compared with feed via mineralization but decreased less in systems with a greater proportion of available P input (e.g., orthophosphate and phospholipids). Feed and drying effect the concentrations and forms of P in feces and their potential impact on soil and water quality. Although bioavailable P in feces from pasture\u2010based and confined systems can be similar in spring, dung\u2010P is distributed on a lower kg P ha<jats:sup>\u22121<\/jats:sup> rate in grazing systems. The best method to mitigate P loss from feces is to decrease P in feed.<\/jats:p>","DOI":"10.2134\/jeq2007.0086","type":"journal-article","created":{"date-parts":[[2008,5,3]],"date-time":"2008-05-03T22:03:16Z","timestamp":1209852196000},"page":"741-752","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":46,"title":["A Comparison of Phosphorus Speciation and Potential Bioavailability in Feed and Feces of Different Dairy Herds Using <sup>31<\/sup>P Nuclear Magnetic Resonance Spectroscopy"],"prefix":"10.1002","volume":"37","author":[{"given":"R. W.","family":"McDowell","sequence":"first","affiliation":[{"name":"AgResearch Invermay Agricultural Centre Private Bag 50034 Mosgiel New Zealand"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Z.","family":"Dou","sequence":"additional","affiliation":[{"name":"Section of Animal Production Systems School of Veterinary Medicine, Univ. of Pennsylvania 382 West Street Road Kennett Square PA 19348"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"J. D.","family":"Toth","sequence":"additional","affiliation":[{"name":"Section of Animal Production Systems School of Veterinary Medicine, Univ. of Pennsylvania 382 West Street Road Kennett Square PA 19348"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"B. J.","family":"Cade\u2010Menun","sequence":"additional","affiliation":[{"name":"Dep. of Geological and Environmental Science Stanford Univ. 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