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United States Department of Agriculture

Agricultural Research Service

Research Project: Improving Efficiency of Growth and Nutrient Utilization in Heavy Broilers Using Alternative Feed Ingredients

Location: Poultry Research

Title: Comparison of amino acid digestibility coefficients for corn, corn gluten meal, and corn distillers dried grains with solubles (DDGS) among three different bioassays

Authors
item Kim, Elizabeth
item Utterback, P -
item Parsons, C -

Submitted to: Poultry Science
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: September 1, 2012
Publication Date: December 5, 2012
Citation: Kim, E.J., Utterback, P.L., Parsons, C.M. 2012. Comparison of amino acid digestibility coefficients for corn, corn gluten meal, and corn distillers dried grains with solubles (DDGS) among three different bioassays. Poultry Science. 91:3141-3147.

Interpretive Summary: The objective of this study was to determine standardized AA digestibility of corn, corn gluten meal (CGM) and three distillers dried grains with solubles (DDGS) using the precision-fed cecectomized rooster assay (PFR), the standardized ileal AA broiler chicken assay (SIAAD), and a newly developed precision-fed ileal broiler chicken assay (PFC). For the PFR, cecectomized roosters were precision-fed approximately 30 g of feed sample and excreta were collected 48 hours post-feeding. For the SIAAD, 16 day-old broilers were allowed free access to a semi-purified diet containing the feed samples as the sole source of protein from 17 to 21 d, with ileal digesta collected at 21 d. For the PFC, 22 day-old broiler chickens were precision-fed 10 g of feed and ileal digesta were collected at 4 hours post-feeding. For corn, precision-fed broiler chicks yielded higher digestibilities than the broilers fed a semi-purified diet and the precision-fed roosters. For CGM, the rooster assay yielded higher values than the precision-fed broilers for the majority of the AA, with broilers fed a semi-purified diet yielding intermediate values. When three DDGS samples were evaluated, the rooster assay produced higher digestibilities than the precision-fed broilers for all three DDGS samples. When comparing the roosters and the two broiler assays, the rooster assay yielded higher values than the free-fed broilers for one DDGS, whereas there was generally no significant difference between these two methods for the other two DDGS samples. The results of this study indicate there were differences among standardized AA digestibility values for the PFR, SIAAD, and PFC in some instances. The differences among methods were not consistent; however, the rooster assay yielded higher digestibility values than the PFC for 4 of the 5 ingredient samples.

Technical Abstract: The objective of this study was to determine standardized AA digestibility of corn, corn gluten meal (CGM) and three distillers dried grains with solubles (DDGS) using the precision-fed cecectomized rooster assay (PFR), the standardized ileal AA broiler chicken assay (SIAAD), and a newly developed precision-fed ileal broiler chicken assay (PFC). For the PFR, cecectomized roosters were precision-fed approximately 30 g of feed sample and excreta were collected 48 hours post-feeding. For the SIAAD, 16 day-old broilers were ad libitum fed a semi-purified diet containing the feed samples as the sole source of protein from 17 to 21 d, with ileal digesta collected at 21 d. For the PFC, 22 day-old broiler chickens were precision-fed 10 g of feed and ileal digesta were collected at 4 hours post-feeding. For corn, the PFC yielded significantly higher digestibilities than the SIAAD and PFR for several AA. For CGM, the PFR yielded significantly higher values than the PFC for the majority of the AA, with the SIAAD yielding intermediate values. When three DDGS samples were evaluated, the PFR produced higher digestibilities than the PFC for all three DDGS samples for most of the AA. When comparing the PFR and the SIAAD, the PFR yielded higher values than the SIAAD for one DDGS, whereas there was generally no significant difference between these two methods for the other two DDGS samples. The results of this study indicate there were differences among standardized AA digestibility values for the PFR, SIAAD, and PFC in some instances. The differences among methods were not consistent; however, the PFR yielded higher digestibility values than the PFC for 4 of the 5 ingredient samples.

Last Modified: 11/25/2014
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