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Asian-Australas J Anim Sci > Accepted Articles
DOI: https://doi.org/10.5713/ajas.19.0449    [Accepted] Published online November 12, 2019.
Standardized ileal digestibility of amino acids in cereal grains and co-products in growing pigs
Su A Lee1,2  , Jong Young Ahn1  , Ah Reum Son3  , Beob Gyun Kim1,3,* 
1Department of Animal Science and Technology, Konkuk University, Seoul 05029, Korea
2Department of Animal Sciences, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
3Monogastric Animal Feed Research Institute, Konkuk University, Seoul 05029, Korea
Correspondence:  Beob Gyun Kim, Tel: +82-2-2049-6255, Fax: +82-2-455-1044, Email: beobgyun@naver.com
Received: 28 May 2019   • Revised: 3 July 2019   • Accepted: 28 May 2019
Abstract
Objective
The objective was to determine standardized ileal digestibility (SID) of crude protein (CP) and amino acids (AA) in cereal grains and various co-products fed to growing pigs.
Methods
Ten feed ingredients tested were barley (9.3% CP), lupin kernels (31.1% CP), and wheat (11.3% CP) as cereal grains, and 2 sources of corn gluten feed produced in China (21.6% CP) and Korea (24.6% CP), corn gluten meal (65.3% CP), lupin hulls (11.6% CP), rice bran (14.5% CP), soybean meal (44.8% CP), and wheat bran (15.4% CP) as co-products. Ten experimental diets were formulated to contain each ingredient as a sole source of N and an N-free diet was used to correct basal endogenous losses of CP and AA. All diets also contained 0.5% Cr2O3 as an indigestible index. A replicated 11 × 6 incomplete Latin square design with 11 dietary treatments, 6 periods, and 22 animals was employed. Twenty-two barrows with an initial body weight of 64.6 ± 4.9 kg were equipped with a T-cannula in the distal ileum. An experimental period consisted of a 4-d adaptation period and a 2-d collection period.
Results
The SID of CP in the barley, lupin kernels, wheat, 2 sources of corn gluten feed, corn gluten meal, lupin hulls, rice bran, soybean meal, and wheat bran were 84.7, 90.5, 90.4, 77.4, 74.6, 89.5, 90.4, 74.4, 86.9, and 63.4% [standard error of the mean (SEM) = 5.3, p=0.006], respectively. The respective SID values of Lys were 75.5, 88.4, 83.9, 74.7, 62.4, 80.3, 83.9, 78.5, 88.0, and 71.2% (SEM = 3.3, p<0.001), and the SID values of Met were 83.6, 88.7, 89.4, 85.7, 78.3, 88.9, 89.4, 85.3, 91.1, and 77.0% (SEM = 2.4, p<0.001), respectively.
Conclusion
The ileal digestibility of protein and amino acids varies among the feed ingredients fed to pigs.
Keywords: Alternative Feed Ingredient; Cereal Grains; Co-products; Digestibility; Swine


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