title: Measurement of true ileal phosphorus digestibility in meat and bone meal for broiler chickens.
abstract: An experiment was conducted to estimate true ileal phosphorus (P:) digestibility of 3 meat and bone meal samples (MBM-1, MBM-2: , and MBM-3:) for broiler chickens. Four semipurified diets were formulated from each sample to contain graded concentrations of P. The experiment was conducted as a completely randomized design with 6 replicates (6 birds per replicate) per dietary treatment. A total of 432 Ross 308 broilers were assigned at 21 d of age to the 12 test diets. The apparent ileal digestibility coefficient of P was determined by the indicator method, and the linear regression method was used to determine the true P digestibility coefficient. The apparent ileal digestibility coefficient of P in birds fed diets containing MBM-1 and MBM-2 was unaffected by increasing dietary concentrations of P (P > 0.05). The apparent ileal digestibility coefficient of P in birds fed the MBM-3 diets decreased with increasing P concentrations (linear, P < 0.001; quadratic, P < 0. 01). In birds fed the MBM-1 and MBM-2 diets, ileal endogenous P losses were estimated to be 0.049 and 0.142 g/kg DM intake (DMI:), respectively. In birds fed the MBM-3 diets, endogenous P loss was estimated to be negative (-0.370 g/kg DMI). True ileal P digestibility of MBM-1, MBM-2, and MBM-3 was determined to be 0.693, 0.608, and 0.420, respectively. True ileal P digestibility coefficients determined for MBM-1 and MBM-2 were similar (P < 0.05), but were higher (P < 0.05) than that for MBM-3. Total P and true digestible P contents of MBM-1, MBM-2, and MBM-3 were determined to be 37.5 and 26.0; 60.2 and 36.6; and 59.8 and 25.1 g/kg, respectively, on an as-fed basis.
authors.affiliation: Institute of Veterinary, Animal and Biomedical Sciences, Massey University, Palmerston North 4442, New Zealand.
authors.forename: R K
authors.initials: RK
authors.lastname: Mutucumarana
authors.affiliation: Institute of Veterinary, Animal and Biomedical Sciences, Massey University, Palmerston North 4442, New Zealand V.Ravindran@massey.ac.nz.
authors.forename: V
authors.initials: V
authors.lastname: Ravindran
authors.affiliation: Institute of Food, Nutrition and Human Health, Massey University, Palmerston North 4442, New Zealand.
authors.forename: G
authors.initials: G
authors.lastname: Ravindran
authors.affiliation: Poultry Research Foundation, University of Sydney, Camden, NSW 2570, Australia.
authors.forename: A J
authors.initials: AJ
authors.lastname: Cowieson
mesh_terms: D000821:Animal Feed / Q000032:analysis; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D001688:Biological Products / Q000378:metabolism; D002645:Chickens / Q000502:physiology*; D004032:Diet / Q000662:veterinary; D004063:Digestion; D007082:Ileum / Q000502:physiology; D008297:Male; D008460:Meat; D008903:Minerals / Q000378:metabolism*; D010758:Phosphorus / Q000378:metabolism*; D011897:Random Allocation
chemical_list: D001688:Biological Products; D008903:Minerals; D010758:Phosphorus; C027762:bone meal
keywords: broiler; digestible phosphorus; meat and bone meal; true ileal phosphorus digestibility