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Standardized Ileal Amino Acid Digestibility of Meat and Bone Meal from Different Sources in Broiler Chicks and Turkey Poults with a Nitrogen-Free or Casein Diet¹

S. A. Adedokun^*, C. M. Parsons, M. S. Lilburn, O. Adeola^* and T. J. Applegate^*,2

^* Department of Animal Sciences, Purdue University, 915 W. State Street, West Lafayette, IN 47907-2054; Department of Animal Sciences, University of Illinois, Urbana-Champaign 61801; and Department of Animal Sciences, The Ohio State University, Ohio Agricultural Research and Development Center, Wooster 44691

² Corresponding author: applegt{at}purdue.edu

The aim of this study was to determine the effect of the standardization method and age on standardized ileal amino acid digestibility (SIAAD) of 4 meat and bone meal (MBM) samples in broiler chicks and turkey poults. The SIAAD were obtained by correcting apparent ileal digestibility (AID) values for basal ileal endogenous amino acid flow obtained from chicks and poults fed a N-free diet or a highly digestible protein diet (HDP; 100 g of casein/kg of diet). Four diets were formulated to contain 20% CP by using MBM as the only source of CP. Each diet was fed to 6 replicate cages of 30 or 8 birds/cage at 5 and 21 d, respectively, for 5 d. With the exception of all-beef MBM, chick AID values on d 21 were higher (P < 0.05) than on d 5. In poults, however, AID was not different between the 2 ages, with the exception of His, which was higher (P < 0.05) at d 21. There was no difference between methods on SIAAD on d 5 or 21 for all 4 MBM samples in either species. There was no effect of the method of standardization on SIAAD at either age for most amino acids. For chicks, however, standardization of the all-beef MBM sample with HDP resulted in higher (P < 0.05) SIAAD values for most of the amino acids (d 5). In poults at d 5, however, the SIAAD for most of the amino acids in the blended MBM were higher (P < 0.05) with HDP correction. The CV in SIAAD in chicks between the 2 methods of standardization was higher on d 5 (8.1%) relative to d 21 (5.0%) for all treatments. In poults, greater variability was observed on d 21 (8.2%) relative to d 5 (6.7%). Results from this study showed that at d 21, SI-AAD with either the N-free or the HDP diet resulted in similar digestibility values.

Key Words: chick • ileal endogenous amino acid • meat and bone meal • poult • standardized ileal digestibility

¹ Journal Paper No. 2007-18119 of the Purdue University Agricultural Research Programs.