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Determination and prediction of amino acid digestibility in brown rice for growing-finishing pigs |
Qing Ouyang1 
, Rui Li2,*
, Ganyi Feng2
, Gaifeng Hou2
, Xianji Jiang1,2
, Xiaojie Liu1,2
, Hui Tang1,2
, Ciming Long2, Jie Yin1
, Yulong Yin2
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1College of Animal Science and Technology, Hunan Agricultural University, Hunan Co-Innovation Center of Animal Production Safety, Changsha 410128, China
2Key Laboratory of Agro-Ecological Processes in Subtropical Region, National Engineering Laboratory for Poultry Breeding Pollution Control and Resource Technology, Key Laboratory of Animal Nutritional Physiology and Metabolic Process, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China |
Correspondence:
Rui Li, Tel: +86-15874143174, Fax: +86-15874143174, Email: lirui181000@163.com
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Received: 31 October 2023 • Revised: 29 November 2023 • Accepted: 18 February 2024 |
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| Abstract |
Objective
The experiment aimed to determine the standardized ileal digestibility (SID) of crude protein (CP) and amino acids (AA) in 10 brown rice samples fed to pigs, and to construct predictive models for SID of CP and AA based on the physical characteristics and chemical composition of brown rice.
Methods
Twenty-two cannulated pigs (initial body weight: 42.0±1.2 kg) were assigned to a replicated 11×3 incomplete Latin square design, including an N-free diet and 10 brown rice diets. Each period included 5 d adaptation and 2 d ileal digesta collection. Chromic oxide was added at 0.3% to all the diets as an indigestible marker for calculating the ileal CP and AA digestibility.
Results
The coefficients of variation of all detected indices for physical characteristics and chemical composition, except for bulk weight, dry matter (DM) and gross energy (GE), in 10 brown rice samples were greater than 10%. The SID of CP, lysine (Lys), methionine (Met), threonine (Thr) and tryptophan (Trp) in brown rice was 77.2% (62.6% to 85.5%), 87.5% (80.3% to 94.3%), 89.2% (78.9% to 98.9%), 55.4% (46.1% to 67.6%) and 92.5% (86.3% to 96.3%), respectively. The best prediction equations for the SID of CP, Lys, Thr and Trp were as following, SIDCP=﹣664.181+8.484×DM (R2=0.40), SIDLys=53.126+6.031×ether extract (EE) +0.893×thousand-kernel volume (R2=0.66), SIDThr=39.916+7.843×EE (R2=0.41) and SIDTrp=﹣361.588+4.891×DM+0.387×total starch (R2=0.85).
Conclusion
Overall, a great variation exists among 10 sources of brown rice, and the thousand-grain volume, DM, EE, and total starch can be used as the key predictors for SID of CP and AA.
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| Keywords:
Amino Acids Digestibility; Brown Rice; Pigs; Prediction Model |
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