UNASSIGNED: The objective of the study that is presented herein was to determine the true ileal @entity460 ( @entity9495 ) digestibility in meat and bone meal (MBM) for broiler @entity1573 using the direct method. Four MBM samples (coded as MBM-1, MBM-2, MBM-3 and MBM-4) were obtained and analyzed for nutrient composition, particle size distribution and bone to soft tissue ratio. The @entity9495 concentrations of MBM-1, MBM-2, MBM-3 and MBM-4 were determined to be 71, 118, 114 and 81 g/kg, respectively. The corresponding geometric mean particle diameters and bone to soft tissue ratios were 0.866, 0.622, 0.875 and 0.781 mm, and 1:1.49, 1:0.98, 1:0.92 and 1:1.35, respectively. Five experimental diets, including four diets with similar @entity9495 concentration (8.3 g/kg) from each MBM and a @entity9495 and @entity3151 -free diet, were developed. Meat and bone meal served as the sole source of @entity9495 in the MBM diets. @entity6701 (3 g/kg) was incorporated in all diets as an indigestible marker. Each experimental diet was randomly allotted to six replicate cages (eight birds per cage) and offered from d 28 to 31 post-hatch. Apparent ileal @entity9495 digestibility was calculated by the indicator method and corrected for ileal endogenous @entity9495 losses to determine the true ileal @entity9495 digestibility. Ileal endogenous @entity9495 losses were determined to be 88 mg/kg dry matter intake. True ileal @entity9495 digestibility coefficients of MBM-1, MBM-2, MBM-3 and MBM-4 were determined to be 0.560, 0.446, 0.517 and 0.413, respectively. True @entity9495 digestibility of MBM-1 was higher (P < 0.05) than MBM-2 and MBM-4 but similar (P > 0.05) to that of MBM-3. True @entity9495 digestibility of MBM-2 was similar (P > 0.05) to MBM-3 and MBM-4, while that of MBM-3 was higher (P < 0.05) than MBM-4. These results demonstrated that the direct method can be used for the determination of true @entity9495 digestibility in feed ingredients and that @entity9495 in MBM is not highly available as often assumed. The variability in true @entity9495 digestibility of MBM samples could not be attributed to @entity9495 content, percentage bones or particle size.

Measurement of true ileal XXXX digestibility in meat and bone meal for broiler @entity1573 using the direct method.

@entity1573 :: ('9031', 'Species') :: ['chickens'] @entity460 :: ('MESH:D002118', 'Chemical') :: ['calcium'] @entity6701 :: ('MESH:C009495', 'Chemical') :: ['Titanium dioxide'] @entity3151 :: ('MESH:D010758', 'Chemical') :: ['phosphorus'] @entity9495 :: ('D002118', 'Chemical') :: ['Ca']
@entity460 :: (MESH:D002118,Chemical) :: ['calcium']
