Kumar Alip, Hosseindoust Abdolreza, Kim MinJu, Kim KwangYeol, Choi YoHan, Lee SeokHee, Lee SongYi, Lee JunHyung, Cho HyunJong, Kang Wei Soo, Chae ByungJo
College of Animal Life Sciences, Kangwon National University, Chuncheon, 24341, Republic of Korea.
Centre for Nutrition and Food Sciences, Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, QLD 4072, Australia.
J Poult Sci. 2021 Jan 25;58(1):21-29. doi: 10.2141/jpsa.0190115.
The effects of dietary supplementation of zinc (Zn) sources and concentrations were investigated on growth performance, absorption into tissues, fecal excretion, nutrient retention, and intestinal morphology in broilers fed a corn-soybean meal basal diet. A total of 525 one-day-old chicks (Ross 308) were assigned based on body weight to seven dietary treatments. There were five replicate pens for each treatment and 15 broilers per replicate pen. The dietary treatments included a basal diet (control, without supplementing Zn), and basal diet supplemented with Zn, as inorganic zinc sulfate (ZnS; 110 mg/kg); organic Zn-methionine (ZnM; 110 mg/kg); hot-melt extruded (HME) 25 zinc sulfate (27.5 mg/kg); HME50 zinc sulfate (55 mg/kg); HME75 zinc sulfate (82.5 mg/kg); or HME100 zinc sulfate (110 mg/kg) for 35 days in two phases (d 1-21, phase I and d 22-35, phase II). Bodyweight and feed efficiency of broiler chicks fed diets supplemented with increasing dietary concentrations of HME-Zn improved linearly during the study period (<0.05). Compared to the control treatment, the ZnS, ZnM, and HME diets increased Zn concentrations in the serum and liver. Inorganic ZnS supply resulted in the highest Zn concentration in excreta. Increasing supplemented Zn content in diets as HME linearly increased Zn concentration in the excreta, serum, liver, and tibia. Broiler chicks fed diets supplemented with increasing concentrations of HME increased villus height (VH; linear and quadratic) of the jejunum and VH of the ileum (linear). Increasing concentrations of dietary Zn supplied as HME resulted in linearly enhanced dry matter, gross energy, and nitrogen retention of broilers on day 21. These results suggest that dietary HME-Zn at a lower level (55 ppm) shows the same growth performance as common ZnSO at 110 ppm.
研究了在以玉米 - 豆粕为基础日粮的肉鸡中，添加不同锌（Zn）源及其浓度对生长性能、组织吸收、粪便排泄、养分保留和肠道形态的影响。根据体重将525只1日龄雏鸡（罗斯308）分配到7种日粮处理组。每个处理有5个重复栏，每个重复栏有15只肉鸡。日粮处理包括基础日粮（对照，不添加锌），以及添加锌的基础日粮，分别为无机硫酸锌（ZnS；110 mg/kg）、有机蛋氨酸锌（ZnM；110 mg/kg）、热熔挤压（HME）25硫酸锌（27.5 mg/kg）、HME50硫酸锌（55 mg/kg）、HME75硫酸锌（82.5 mg/kg）或HME100硫酸锌（110 mg/kg），分两个阶段（第1 - 21天，第一阶段；第22 - 35天，第二阶段）饲喂35天。在研究期间，饲喂添加不同浓度HME - Zn日粮的肉鸡雏鸡的体重和饲料效率呈线性改善（P<0.05）。与对照处理相比，ZnS、ZnM和HME日粮提高了血清和肝脏中的锌浓度。无机ZnS供应导致排泄物中锌浓度最高。日粮中以HME形式增加添加锌含量，排泄物、血清、肝脏和胫骨中的锌浓度呈线性增加。饲喂添加不同浓度HME日粮的肉鸡雏鸡空肠绒毛高度（VH；线性和二次曲线）和回肠VH（线性）增加。日粮中以HME形式供应的锌浓度增加，导致第21天肉鸡的干物质、总能和氮保留呈线性增强。这些结果表明，较低水平（55 ppm）的日粮HME - Zn表现出与110 ppm普通硫酸锌相同的生长性能。
