title: Precaecal phosphorus digestibility of inorganic phosphate sources in male broilers.
abstract: The aim of this study, comprising two experiments, was (1) to determine in Experiment 1 the relationship of incremental dietary P (phosphorus) content on precaecal digestible P in male broilers and (2) to determine in Experiment 2 the precaecal P digestibility of various inorganic P sources at marginal levels of P supply. In Experiment 1, a total of 260 male Ross 308 broilers were divided into groups of 10 birds per pen resulting in 8 replicates for treatment 1 and 6 replicates for treatments 2-4. Experimental diets were formulated to contain 4 incremental concentrations of digestible P by means of increasing concentrations of monocalcium phosphate (MCP). In the second experiment, 480-d-old male Ross 308 broilers were divided in groups of 12 birds per pen resulting in 16 replicates for the basal diet and 6 replicates for each test diet. A total of 4 inorganic P sources, MCP, monodicalcium phosphate (MDCP), dicalcium phosphate (DCP) and defluorinated phosphate (DFP) were added to the basal diet to determine the precaecal P digestibility. Three of the 4 inorganic P sources (MCP, MDCP and DCP) represented a mix of batches from different producers. At the end of both experiments, the chyme of the posterior part of the small intestine was collected. Digestibility of P and Ca was determined using titanium dioxide as indigestible marker. In Experiment 1, a reduction in precaecal digestibility of P was observed above an estimated precaecal digestible dietary P concentration of 4.8 g/kg. The precaecal P digestibility of the tested inorganic P sources in Experiment 2 was 78.3% for MCP, 59.0% for DCP, 70.7% for MDCP and 31.5% for DFP.
authors.affiliation: a Wageningen Livestock Research , Department of Animal Nutrition , Wageningen , The Netherlands.
authors.forename: P
authors.initials: P
authors.lastname: Bikker
authors.affiliation: a Wageningen Livestock Research , Department of Animal Nutrition , Wageningen , The Netherlands.
authors.forename: J W
authors.initials: JW
authors.lastname: Spek
authors.affiliation: a Wageningen Livestock Research , Department of Animal Nutrition , Wageningen , The Netherlands.
authors.forename: R A
authors.initials: RA
authors.lastname: Van Emous
authors.affiliation: a Wageningen Livestock Research , Department of Animal Nutrition , Wageningen , The Netherlands.
authors.forename: M M
authors.initials: MM
authors.lastname: Van Krimpen
mesh_terms: D000821:Animal Feed / Q000032:analysis; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D002645:Chickens / Q000502:physiology*; D004032:Diet / Q000662:veterinary*; D019587:Dietary Supplements; D004063:Digestion / Q000502:physiology*; D008297:Male; D010710:Phosphates / Q000008:administration & dosage / Q000378:metabolism*; D016226:Phosphorus, Dietary / Q000008:administration & dosage / Q000378:metabolism
chemical_list: D010710:Phosphates; D016226:Phosphorus, Dietary