Attia Youssef A, Al-Harthi Mohammed A, Shafi Manal E, Abdulsalam Nisreen M, Nagadi Sameer A, Wang Jinquan, Kim Woo K
Sustainable Agriculture Research Group, Department of Agriculture, Faculty of Environment Sciences, King Abdulaziz University, Jeddah 80269, Saudi Arabia.
Sustainable Agriculture Research Group, Department of Biological Sciences, Zoology, Faculty of Sciences, King Abdulaziz University, Jeddah 21589, Saudi Arabia.
Life (Basel). 2022 Dec 14;12(12):2100. doi: 10.3390/life12122100.
The response to amino acid (AAs) supplementation on broiler production, carcass and meat traits and nitrogen in the excreta during the early growth period was evaluated. Two experiments were performed during 1-28 d (245 birds, experiment 1) and 1-21 d of age (455 birds, experiment 2). In both experiments, the positive control (PC) diet had 22.5% crude protein (CP) and the negative control group (NC) diet had around 18% CP with the same methionine (Met) plus lysine (Lys) concentration as the PC diet. In experiment 1, the NC diet was fed to the other five groups supplemented with synthetic amino acids, such as L-arginine (Arg), L-threonine (Thr), L-valine (Val), L-isoleucine (Ile) or all these AAs, respectively. In experiment 2, the NC diet was formulated to contain 18% CP with either corn-soybean meal and animal protein or with only vegetable protein. Both NC diets were offered to the other ten groups with synthetic amino acids such as L-Arg, L-Thr, L-Val, L-tryptophan (Trp) or a combination of all these AAs plus L-isoleucine (Ile), respectively. In conclusion, broilers fed 18% CP supplemented with DL-Met plus L-Lys showed lower performance and a European production efficiency value (EPEV); Arg, Thr and Val addition improved growth, the feed conversion ratio and EPEV of the diets containing animal protein only, but broiler performance and EPEV was lower than with PC, indicating that DL-Met, L-Lys, L-Arg, L-Thr and L-Val supplementation may be limited in low-protein diets. Furthermore, a low-protein diet supplemented with amino acids did not affect the survivability of broilers up to 28 days of age.
评估了早期生长阶段补充氨基酸（AAs）对肉鸡生产性能、胴体和肉质性状以及排泄物中氮含量的影响。在1至28日龄期间进行了两项试验（试验1，245只鸡）和1至21日龄期间进行了试验（试验2，455只鸡）。在两项试验中，正对照组（PC）日粮粗蛋白（CP）含量为22.5%，负对照组（NC）日粮CP含量约为18%，蛋氨酸（Met）加赖氨酸（Lys）浓度与PC日粮相同。在试验1中，NC日粮分别喂给另外五组补充了合成氨基酸的鸡群，如L-精氨酸（Arg）、L-苏氨酸（Thr）、L-缬氨酸（Val）、L-异亮氨酸（Ile）或所有这些氨基酸。在试验2中，NC日粮配制为CP含量18%，分别含有玉米-豆粕和动物蛋白或仅含植物蛋白。两种NC日粮分别喂给另外十组补充了合成氨基酸的鸡群，如L-Arg、L-Thr、L-Val、L-色氨酸（Trp）或所有这些氨基酸加L-异亮氨酸（Ile）的组合。总之，饲喂补充了DL-Met加L-Lys的18%CP日粮的肉鸡表现较低，欧洲生产效率值（EPEV）也较低；添加Arg、Thr和Val可提高仅含动物蛋白日粮的生长性能、饲料转化率和EPEV，但肉鸡的生产性能和EPEV低于PC组，这表明在低蛋白日粮中补充DL-Met、L-Lys、L-Arg、L-Thr和L-Val可能有限。此外，补充氨基酸的低蛋白日粮对28日龄前肉鸡的存活率没有影响。
