Evaluation of energy and amino acids of brown rice and its effects on laying performance and egg quality of layers

Byoung-Ki An; Su Hyun An; Han-Seul Jeong; Kwan-Eung Kim; Eun Jip Kim; Sang-Rak Lee; Changsu Kong

doi:10.5187/jast.2020.62.3.374

Evaluation of energy and amino acids of brown rice and its effects on laying performance and egg quality of layers

J Anim Sci Technol. 2020 May;62(3):374-384. doi: 10.5187/jast.2020.62.3.374. Epub 2020 May 31.

Authors

Byoung-Ki An¹, Su Hyun An², Han-Seul Jeong¹, Kwan-Eung Kim³, Eun Jip Kim⁴, Sang-Rak Lee¹, Changsu Kong^{2

5}

Affiliations

¹ Department of Animal Science and Technology, Konkuk University, Seoul 05029, Korea.
² Department of Animal Science and Biotechnology, Kyungpook National University, Sangju 37224, Korea.
³ R&D Center, Nonghyup Feed, Seoul 05398, Korea.
⁴ Division of Animal Husbandry, Yonam College, Cheonan 31005, Korea.
⁵ Department of Animal Science, Kyungpook National University, Sangju 37224, Korea.

Abstract

Two experiments were conducted to determine apparent metabolizable energy (AME), nitrogen-corrected AME (AMEn), and ileal digestible amino acid (AA) content of brown rice (BR) and to investigate the effect of dietary supplementation of BR on laying performance and egg quality of laying hens. In Exp. 1, 72 Hy-line Brown layers (49-week-old) were allocated to two treatments using a completely randomized block design, and each treatment included six cages per treatment and six hens per cage. A semi-purified diet was formulated to include BR as the sole source of AA and energy and an N-free diet was used to determine basal endogenous loss of AA. The hens were fed a commercial layer diet for adaptation to the experimental environment and diet for 7 days from d 0, and then fed experimental diets for 5 days from d 7. Excreta were collected from d 10 to 11 and ileal digesta were collected on d 12. On a dry matter (DM) basis, the AME and AMEn of BR was determined at 3,773 and 3,729 kcal/kg, respectively. The apparent ileal digestibility (AID) of BR ranged from 32.7% for Thr to 73.7% for Arg. The range of the standardized ileal digestibility (SID) value was between 79.4% for Met and 96.6% for Lys. In Exp. 2, 252 Hy-line Brown layers (44-week-old) were divided into four groups, comprising seven replicates of nine birds each and assigned to four experimental diets containing 0 (Control), 5%, 10%, or 15% BR for 5 weeks. The BR-containing diets were formulated to be equal in the content of AMEn and digestible AA to those of the diet without BR. No significant differences were observed in laying performances. Egg quality and blood profiles were not linearly or quadratically affected by dietary treatments. These results suggest that up to 15% BR can be included into layer feed without any adverse effects on laying performance and egg quality, if its energy and digestible AA values are well evaluated.

Keywords: Apparent metabolizable energy; Brown rice; Egg production; Laying hens; Standardized ileal digestible amino acids.