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- W2002116352 abstract "Phosphorus (P) modifications of poultry diets have successfully decreased the total P (TP) in manures, but the effects on manure water-soluble P (WSPM) remain unclear. Our objectives were to characterize P forms in broiler breeder manures as affected by dietary P modification, location within the pen, and manure accumulation period. Two diets were formulated with and without phytase to attain 0.40% available P (AvP) during the breeder laying phase (22–64 wk of age). Manure was collected after accumulation periods of 48 h, 3 wk, and 39 wk in locations under the feeder and drinker and underthe common area (between the feeder and drinker) of the pen. The TP, WSPM, orthophosphate, and phytate in manure were measured. Broiler breeders that were fed phytase with a simultaneous reduction in nonphytate P (NPP) produced manures with 15% lower TP than those fed a traditional diet, but did not change WSPM when averaged over manure accumulation periods and locations within the pen. Regardless of diet, location within the pen, or accumulation period (r2 = 0.76), the WSPM increased linearly as the manure moisture increased. As manure accumulation periods increased (48 h, 3 wk, and 39 wk), TP manure concentrations increased (11.9, 13.2, and 17.3 g/kg, respectively), orthophosphate proportions increased (73.2, 80.1, and 91.0%, respectively), and phytate proportions decreased (23.1, 17.0, and 6.7%, respectively). The mineralization of phytate and other organic complexes, which drive off carbon dioxide, presumably contributed to the increased orthophosphate and TP concentrations. Keeping breeder manures dry helps to avoid the mineralization of phytate to orthophosphate; this mineralization increased WSPM in our study, and thus increased the potential for elevated P loss in runoff when surface applied." @default.
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- W2002116352 date "2011-12-01" @default.
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- W2002116352 title "Broiler breeder manure phosphorus forms are affected by diet, location, and period of accumulation" @default.
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- W2002116352 doi "https://doi.org/10.3382/ps.2011-01584" @default.
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