title: Water-soluble phosphorus in fresh broiler litter is dependent upon phosphorus concentration fed but not on fungal phytase supplementation.
abstract: This experiment determined the effects of different phosphorus (P) feeding programs on total and water-soluble P excretion by broilers. Ross 308, male broilers were fed an industry (IND) diet (0.48, 0.35, 0.31, and 0.30% nonphytate P; NPP), an industry diet with reduced NPP and supplemental phytase [IND + PT; 600 phytase units (FTU)/kg; 0.36, 0.26, 0.20, and 0.19% NPP], a diet to more closely meet the birds' NPP requirements in which NPP was reduced further with supplemental phytase (REQ + P; 600 FTU/kg; 0.36, 0.26, 0.19, and 0.09% NPP), or a diet with low-phytate(lpa 1-1) corn with supplemental phytase (LPA + P; 600 FTU/kg; 0.37, 0.29, 0.19, 0.19% NPP). These diets were fed from hatch to 17 d, 17 to 31 d, 31 to 42 d, and 42 to 49 d of age, respectively. Fungal phytase was analyzed prior to diet formulation. Diets were fed to six replicate pens of 39 birds per pen. Litter samples were collected at 49 d of age and frozen prior to analyses. Diet did not significantly affect broiler performance (average BW at 49 d = 3.03 kg), tibia, or toe ash throughout the study (P > 0.05). Litter from broilers fed the IND diet was significantly higher (P < or = 0.05) in total and water-soluble P (1.11 and 0.22% of DM, respectively) compared with litter from broilers fed IND + PT (0.84 and 0.14% of DM, respectively), REQ + P (0.78 and 0.11% of DM, respectively), or LPA + PT (0.64 and 0.12% of DM, respectively). Litter total and water-soluble P were not significantly different among broilers fed IND + PT, REQ + PT, or LPA + PT. In conclusion, phytase supplementation did not affect the solubility of P in the litter regardless of P feeding program.
authors.affiliation: Purdue University, Department of Animal Sciences, West Lafayette, Indiana 47907, USA. applegt@purdue.edu
authors.forename: T J
authors.initials: TJ
authors.lastname: Applegate
authors.forename: B C
authors.initials: BC
authors.lastname: Joern
authors.forename: D L
authors.initials: DL
authors.lastname: Nussbaum-Wagler
authors.forename: R
authors.initials: R
authors.lastname: Angel
mesh_terms: D010832:6-Phytase / Q000008:administration & dosage / Q000494:pharmacology*; D000821:Animal Feed; D000818:Animals; D002645:Chickens / Q000254:growth & development* / Q000502:physiology; D004032:Diet; D019587:Dietary Supplements; D005658:Fungi / Q000201:enzymology; D008297:Male; D008372:Manure; D010758:Phosphorus / Q000737:chemistry / Q000493:pharmacokinetics*; D012037:Refuse Disposal; D012995:Solubility
chemical_list: D008372:Manure; D010758:Phosphorus; D010832:6-Phytase