title: Results of an international phosphorus digestibility ring test with broiler chickens.
abstract: The objective of this ring test was to investigate the prececal phosphorus (P) digestibility of soybean meal (SBM) in broiler chickens using the trial protocol proposed by the World's Poultry Science Association. It was hypothesized that prececal P digestibility of SBM determined in the collaborating stations is similar. Three diets with different inclusion levels of SBM were mixed in a feed mill specialized in experimental diets and transported to 17 collaborating stations. Broiler chicks were raised on commercial starter diets according to station-specific management routine. Then they were fed the experimental diets for a minimum of 5 d before content of the posterior half of the ileum was collected. A minimum of 6 experimental replicates per diet was used in each station. All diets and digesta samples were analyzed in the same laboratory. Diet, station, and their interaction significantly affected (P < 0.05) the prececal digestibility values of P and calcium of the diets. The prececal P digestibility of SBM was determined by linear regression and varied among stations from 19 to 51%, with significant differences among stations. In a subset of 4 stations, the prececal disappearance of myo-inositol 1,2,3,4,5,6-hexakis (dihydrogen phosphate)-P; InsP6-P) also was studied. The prececal InsP6-P disappearance correlated well with the prececal P digestibility. We hypothesized that factors influencing InsP6 hydrolysis were main contributors to the variation in prececal P digestibility among stations. These factors were probably related to the feeding and housing conditions (floor pens or cages) of the birds in the pre-experimental phase. Therefore, we suggest that the World's Poultry Science Association protocol for the determination of digestible P be should extended to the standardization of the pre-experimental period. We also suggest that comparisons of P digestibility measurements among studies are made only with great caution until the protocol is more refined.
authors.affiliation: Institute of Animal Science, University of Hohenheim, 70599 Stuttgart, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Rodehutscord
authors.affiliation: Department of Animal Sciences, Purdue University, West Lafayette, IN 47907.
authors.forename: O
authors.initials: O
authors.lastname: Adeola
authors.affiliation: Department of Animal and Avian Sciences, University of Maryland, College Park, MD 20742.
authors.forename: R
authors.initials: R
authors.lastname: Angel
authors.affiliation: Wageningen University & Research, Wageningen Livestock Research, 6700 AH Wageningen, The Netherlands.
authors.forename: P
authors.initials: P
authors.lastname: Bikker
authors.affiliation: Animal Sciences Unit, Institute for Agricultural and Fisheries Research (ILVO), 9090 Melle, Belgium.
authors.forename: E
authors.initials: E
authors.lastname: Delezie
authors.affiliation: Department of Poultry Science, Auburn University, Auburn, AL 38649.
authors.forename: W A
authors.initials: WA
authors.lastname: Dozier
authors.affiliation: DSM Nutritional Products, 68128 Village-Neuf, France.
authors.forename: M
authors.initials: M
authors.lastname: Umar Faruk
authors.affiliation: IRTA, Mas de Bover, 43120 Constantí (Tarragona), Spain.
authors.forename: M
authors.initials: M
authors.lastname: Francesch
authors.affiliation: Schothorst Feed Research BV, 8200 AM Lelystad, The Netherlands.
authors.forename: C
authors.initials: C
authors.lastname: Kwakernaak
authors.affiliation: INRA-UR0083, Recherches Avicoles, 37380 Nouzilly, France.
authors.forename: A
authors.initials: A
authors.lastname: Narcy
authors.affiliation: Department of Animal Science, University of Manitoba, Winnipeg, MB, Canada R3T 2N2.
authors.forename: C M
authors.initials: CM
authors.lastname: Nyachoti
authors.affiliation: Monogastric Science Research Centre, Scotland's Rural College, Edinburgh, EH9 3JG, UK.
authors.forename: O A
authors.initials: OA
authors.lastname: Olukosi
authors.affiliation: Adisseo - Cern, 6 route noire, 03600 Malicorne, France.
authors.forename: A
authors.initials: A
authors.lastname: Preynat
authors.affiliation: SAS Euronutrition, Domaine Expérimental le Pavillon, 72240 Saint Symphorien, France.
authors.forename: B
authors.initials: B
authors.lastname: Renouf
authors.affiliation: Trouw Nutrition R&D Poultry Research Centre, 45950 Casarrubios del Monte, Spain.
authors.forename: A
authors.initials: A
authors.lastname: Saiz Del Barrio
authors.affiliation: Institute of Animal Nutrition, Livestock Products and Nutrition Physiology, University of Natural Resources and Life Sciences, Vienna, 1190 Vienna, Austria.
authors.forename: K
authors.initials: K
authors.lastname: Schedle
authors.affiliation: Institute of Animal Science, University of Hohenheim, 70599 Stuttgart, Germany.
authors.forename: W
authors.initials: W
authors.lastname: Siegert
authors.affiliation: Department of Animal Science, Aarhus University, Blichers Allé 20, 8830 Tjele, Denmark.
authors.forename: S
authors.initials: S
authors.lastname: Steenfeldt
authors.affiliation: Wageningen University & Research, Wageningen Livestock Research, 6700 AH Wageningen, The Netherlands.
authors.forename: M M
authors.initials: MM
authors.lastname: van Krimpen
authors.affiliation: Department of Animal Science, University of Manitoba, Winnipeg, MB, Canada R3T 2N2.
authors.forename: S M
authors.initials: SM
authors.lastname: Waititu
authors.affiliation: Institute of Animal Science, University of Hohenheim, 70599 Stuttgart, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Witzig
mesh_terms: D000821:Animal Feed / Q000032:analysis; D000822:Animal Husbandry / Q000379:methods; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D002136:Calcium, Dietary / Q000378:metabolism; D002645:Chickens / Q000502:physiology*; D004032:Diet / Q000662:veterinary*; D004063:Digestion / Q000502:physiology*; D016226:Phosphorus, Dietary / Q000378:metabolism*; D013025:Glycine max
chemical_list: D002136:Calcium, Dietary; D016226:Phosphorus, Dietary
keywords: broiler chickens; phosphorus; phytate; prececal digestibility; variability