Xie Kun, He Xi, Hou De-Xing, Zhang Bingkun, Song Zehe
College of Animal Science and Technology, Hunan Engineering Research Center for Poultry Safety, Hunan Agricultural University, Changsha 410128, China.
Course of Biological Science and Technology, United Graduate School of Agricultural Sciences, Kagoshima University, Kagoshima 890-0056, Japan.
Animals (Basel). 2021 Jun 25;11(7):1894. doi: 10.3390/ani11071894.
Rice, broken rice (BR), and full-fat rice bran (FFRB) from six different origins were analyzed for their chemical composition, nitrogen-corrected apparent metabolized energy (AMEn), and standardized amino acid digestibility (SIAAD) in 14-day-old and 28-day-old Arbor Acres broilers. Results showed broilers fed with rice and BR had a similar AMEn regardless of the rice and BR having different CP, EE, NDF, ADF, and ash content. FFRB containing significantly different CP, EE, NDF, ADFm and starch presented variable AMEn ( < 0.05), suggesting that starch content in rice and its byproducts contributed most to the AMEn of broilers. The regression equation of AMEn = 14.312 - (0.198 × NDF) and AMEn = 6.491 + (0.103 × Starch) were feasible to integrally predict AMEn of broilers fed to rice and its byproducts. Moreover, 28-day-old broilers had higher SIAAD than 14-day-old ones. The SIAAD of rice were higher than BR and FFRB except for Met, Cys, Thr, and Tyr in 14-day-old broilers ( < 0.05), and the SIAAD of His, Asp, and Ser in BR were higher than FFRB ( < 0.05). In 28-day-old broilers, the SIAAD of Leu, Trp, Asp, Gly, and Pro of rice were still higher than BR and FFRB ( < 0.05), but BR and FFRB had no significant differences ( > 0.05). The regression equations to estimate the SIAAD of Thr, Lys, and Met were: Met = 81.46 + (0.578 × CP), Thr = 0.863 + (6.311 × CP), and Trp = 102.883 - (1.77 × CP), indicating that CP content in rice and its byproducts was likely a major factor for prediction of SIAAD.
对来自六个不同产地的大米、碎米（BR）和全脂米糠（FFRB）进行了化学成分、氮校正表观代谢能（AMEn）以及14日龄和28日龄爱拔益加肉鸡的标准化氨基酸消化率（SIAAD）分析。结果表明，无论大米和碎米的粗蛋白（CP）、粗脂肪（EE）、中性洗涤纤维（NDF）、酸性洗涤纤维（ADF）和灰分含量如何不同，用大米和碎米饲喂的肉鸡具有相似的AMEn。全脂米糠的CP、EE、NDF、ADF和淀粉含量差异显著，其AMEn也有所不同（P<0.05），这表明大米及其副产品中的淀粉含量对肉鸡的AMEn贡献最大。AMEn = 14.312 - (0.198 × NDF)和AMEn = 6.491 + (0.103 × 淀粉)的回归方程可用于综合预测用大米及其副产品饲喂的肉鸡的AMEn。此外，28日龄肉鸡的SIAAD高于14日龄肉鸡。在14日龄肉鸡中，除蛋氨酸、半胱氨酸、苏氨酸和酪氨酸外，大米的SIAAD高于碎米和全脂米糠（P<0.05），碎米中组氨酸、天冬氨酸和丝氨酸的SIAAD高于全脂米糠（P<0.05）。在28日龄肉鸡中，大米的亮氨酸、色氨酸、天冬氨酸、甘氨酸和脯氨酸的SIAAD仍高于碎米和全脂米糠（P<0.05），但碎米和全脂米糠之间无显著差异（P>0.05）。估计苏氨酸、赖氨酸和蛋氨酸SIAAD的回归方程分别为：蛋氨酸 = 81.46 + (0.578 × CP)，苏氨酸 = 0.863 + (6.311 × CP)，色氨酸 = 102.883 - (1.77 × CP)，这表明大米及其副产品中的CP含量可能是预测SIAAD的主要因素。
