Abuajamieh Mohannad, Al-Qaisi Mohmmad, Mahasneh Zeinab M H, Istatieh Rahaf, Abedal-Majed Mohamed A, Abdelqader Anas, Al-Fataftah Abdur-Rahman
Department of Animal Production, School of Agriculture, University Jordan, Amman 11942, Jordan.
Department of Animal Production, School of Agriculture, University Jordan, Amman 11942, Jordan.
Poult Sci. 2025 Mar 19;104(6):105065. doi: 10.1016/j.psj.2025.105065.
Heat stress (HS) has negative impacts on farm animals. Many studies have been conducted to ameliorate the effects of HS in farm animals. The current project investigated the effects of β-glucan (BG) supplementation under thermo-neutral and HS conditions on the production, physiological, and histological parameters in broiler chickens. Three-hundred and twenty chicks were randomly assigned into four treatments (10 replicates/treatment; 8 chicks/replicate). The treatments were: 1) a basal diet (Ctrl); 2) a diet containing 1 g/kg of β-glucan (BG1); 3) a diet containing 2 g/kg of β-glucan (BG2); 4) a diet containing 3 g/kg of β-glucan (BG3). All treatments were reared under thermo-neutral (TN) conditions from day 0-30 days of age then exposed to cyclical HS at the age of 31 days for 3 consecutive days (4 hours/day). During HS conditions, BG3 has increased feed intake (FI; 23 %; P < 0.01), and decreased rectal temperature (Tr) relative to the control treatment (0.5 °C; P <0.01). Besides, supplementing BG has improved average daily gain under HS conditions. In addition, BG supplementation had a positive effect on intestinal morphometric parameters (villous height, width, depth, and surface area) under HS conditions. In conclusion, feeding BG improved FI, average daily gain (ADG), and intestinal health in heat-stressed broiler chickens.
热应激（HS）对农场动物有负面影响。已经进行了许多研究来减轻热应激对农场动物的影响。当前项目研究了在热中性和热应激条件下补充β-葡聚糖（BG）对肉鸡生产、生理和组织学参数的影响。320只雏鸡被随机分为四种处理（每个处理10个重复；每个重复8只鸡）。处理方式如下：1）基础日粮（对照）；2）含有1 g/kg β-葡聚糖的日粮（BG1）；3）含有2 g/kg β-葡聚糖的日粮（BG2）；4）含有3 g/kg β-葡聚糖的日粮（BG3）。所有处理在0至30日龄时在热中性（TN）条件下饲养，然后在31日龄时连续3天（每天4小时）暴露于周期性热应激。在热应激条件下，与对照处理相比，BG3增加了采食量（FI；23%；P<0.01），并降低了直肠温度（Tr）（0.5°C；P<0.01）。此外，补充BG改善了热应激条件下的平均日增重。另外，在热应激条件下，补充BG对肠道形态学参数（绒毛高度、宽度、深度和表面积）有积极影响。总之，在热应激肉鸡中饲喂BG可提高采食量、平均日增重（ADG）并改善肠道健康。
