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Asian-Australas J Anim Sci > Accepted Articles
DOI: https://doi.org/10.5713/ajas.19.0196    [Accepted] Published online July 1, 2019.
Effects of particle size and lipid form of corn on energy and nutrient digestibility in diets for growing pigs
Zhiqian Lyu1, Quanfeng Li1, Yifan Wu1, Chengfei Huang1,*
State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing 100193, China
Correspondence:  Chengfei Huang, Tel: +86-10-6273-3688, Fax: +86-10-6273-3688, Email: chfhuang@126.com
Received: 9 March 2019   • Revised: 10 April 2019   • Accepted: 13 June 2019
Two experiments were conducted to evaluate the effects of corn particle size and lipid form on the apparent total tract digestibility (ATTD) of energy and nutrients in diets for growing pigs.
In Exp.1, thirty barrows (initial BW: 53.1 ± 3.9 kg) were allotted to 1 of 5 diets formulated with 96.9% corn ground to 441, 543, 618, 659, and 768 μm, respectively. In Exp. 2, thirty-six barrows (initial BW: 54.7 ± 3.6 kg) were allotted to 1 of 6 diets formulated by including 2 or 15% corn germ (CG 2 or CG 15), 1 or 6% corn oil (CO 1 or CO 6), 1% CO + 2% corn germ meal + (CO 1 + CGM 2), or 6% CO + 15% corn germ meal (CO 6 + CGM 15), respectively.
The ATTD of gross energy (GE) and the digestible energy (DE) in diet and corn grain linearly decreased as the corn particle size increased (p < 0.05) from 441 to 768 μm. Particle size had a quadratic effect (p < 0.05) on the ATTD of NDF and ADF in diets, and which firstly increased and then decreased as the corn particle size increased from 441 to 618 µm and 618 to 768 µm, respectively. The ATTD of GE, EE, and the DE in CO 1 diet and CO 6 diet was greater (p < 0.05) than that in CG 2 diet and CG 15 diet, respectively. The ATTD of EE in CO 6 diet and CO 6 + CGM 15 diet was greater (p < 0.05) than that in CO 1 diet and CO 1 + CGM 2 diet.
Less than 618 µm was recommended for corn particle size in growing pig’s diet and extracted lipid had greater digestibility than the intact lipid in corn. Higher concentration of extracted corn oil had greater digestibility of EE compared with lower concentrations of corn oil diet.
Keywords: Corn; Energy; Lipid Form; Nutrient Digestibility; Particle Size; Pig

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