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An Ileal Amino Acid Digestibility Assay for the Growing Meat Chicken-Effect of Feeding Method and Digesta Collection Procedures

  • Yap, K.H. (Monogastric Research Centre, Massey University) ;
  • Kadim, I.T. (Monogastric Research Centre, Massey University) ;
  • King, R.D. (Monogastric Research Centre, Massey University) ;
  • Moughan, P.J. (Monogastric Research Centre, Massey University)
  • Received : 1996.12.09
  • Accepted : 1997.08.18
  • Published : 1997.12.01

Abstract

The objective was to evaluate method of feeding (free access or intubation), method of slaughter (carbon dioxide gas or barbiturate) and digesta flushing medium (distilled water or physiological saline), in the development of an ileal amino acid digestibility assay for 4 week-old broiler chickens. Three diets were used (commercial (C), semi-synthetic meat-and bone meal (MBM) or wheat (W)). For the coarser C and W diets but not for the MBM diet, feeding method had a significant effect on concentrations of chromium (Cr), nitrogen (N), acid detergent fibre (ADF) and neutral detergent fibre (NDF) in the crop contents at a set time after a meal. There appeared to be a selection of food particles under free-access feeding. For birds receiving the wheat diet there was an effect (p < 0.05) of sampling time after feeding on the concentrations of Cr, N, ADF and NDF/Cr in the crop contents. Flushing ileal digesta with distilled water or saline led to similar apparent ileal N digestibility coefficients. Birds given the MBM diet, and killed by inhalation of $CO_2$, had significantly (p < 0.05) lower apparent ileal N digestibility coefficients (73 versus 80%) than those killed by barbiturate overdose.

Keywords

Chicken;Digestibility;Intubation;Ileal;Nitrogen

Acknowledgement

Supported by : Goodman Fielder Wattie Agri-Products Ltd.

Cited by

  1. Ileal amino acid digestibility assay for the growing meat chicken--comparison of ileal and excreta amino acid digestibility in the chicken vol.43, pp.4, 2002, https://doi.org/10.1080/0007166022000004507
  2. Rapeseed and soybean products as protein sources for growing turkeys of different ages vol.45, pp.5, 2004, https://doi.org/10.1080/00071660400006479