Standardized ileal amino acid digestibility of plant feedstuffs in broiler chickens and turkey poults using a nitrogen-free or casein diet

S. A. Adedokun, O. Adeola, C. M. Parsons, M. S. Lilburn, T. J. Applegate

Research output: Contribution to journalArticlepeer-review

117 Scopus citations

Abstract

The standardized ileal amino acid digestibility (SIAAD) of 5 plant-based ingredients was determined in 5- and 21-d-old broiler chicks and turkey poults. Two diets (N-free diet, NFD, and a highly digestible protein diet 10% casein, HDP) were fed to determine ileal endogenous amino acid flow, and each was used for endogenous amino acid correction for the plant-based ingredients. The plant-based ingredients evaluated were 2 samples of corn distillers dried grains with solubles (light and dark DDGS), canola meal, corn, and soybean meal. Each diet was fed for 5 d to 6 replicate cages containing 30 or 8 birds, which were sampled on d 5 or 21, respectively. For chicks, apparent ileal amino acid digestibility increased with age for all the feed ingredients. After standardization, SIAAD increased with age when chicks were fed DDGS and corn, but not soybean meal or canola meal. For all the feed ingredients evaluated, SIAAD values for both methods of standardization were not different at d 5. However, the HDP method resulted in greater SIAAD values for most of the amino acids in light DDGS, canola meal, and corn (d 21). In poults, the apparent ileal amino acid digestibility values increased with age for all the feed ingredients except the dark DDGS and canola meal. After standardization, there was no effect of age on amino acid digestibility in all the feed ingredients evaluated, with the exception of corn. Within a particular age (d 5 or 21), both methods of standardization resulted in similar amino acid digestibility values except for corn, for which the SIAAD values were greater (NFD method) in 11 amino acids. Results from this study showed that age-appropriate endogenous amino acid standardization is necessary and, in some cases, results in no age-associated differences in amino acid digestibility. With the exception of corn, standardization of amino acid digestibility with ileal endogenous amino acid flow from birds fed an NFD or HDP did not differ for most plant feedstuffs.

Original languageEnglish
Pages (from-to)2535-2548
Number of pages14
JournalPoultry Science
Volume87
Issue number12
DOIs
StatePublished - Dec 1 2008

Bibliographical note

Funding Information:
Partial funding for this project was supplied by the US Poultry and Egg Association (Tucker, GA), Fats and Proteins Research Foundation (Alexandria, VA), Degussa Corporation. (Kennesaw, GA), ADM Inc. (Decatur, IL), Novus International Inc. (St. Louis, MO), and Ajinomoto Heartland LLC (Chicago, IL).

Keywords

  • Amino acid
  • Broiler chick
  • Endogenous amino acid
  • Standardized ileal digestibility
  • Turkey poult

ASJC Scopus subject areas

  • Animal Science and Zoology

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