Artemisia Annua as Phytogenic Feed Additive in the Diet of Broilers (14-35 Days) Reared under Heat Stress (32 ºC)

ABSTRACT The 21 days feeding trial was conducted on 90, Cobb 500 broilers (aged 14 days), assigned to 3 groups (C, E1 and E2) housed in an experimental hall at 32° C constant temperature and 23 h light regimen. During the growth period (14-35 days), the conventional diet (C) had corn and soybean meal as basic ingredients. Unlike the conventional diet formulation (C), the diet formulations for the experimental groups also included 0.005% Artemisia annua oil (E1) and 0.005% Artemisia annua oil plus 1% Artemisia annua powder (E2). Six broilers per group were slaughtered at 35 days of age in order to measure the weight of the carcass and internal organs of broilers, and samples of intestinal and caecal content were collected for bacteriological assessment (Enterobacteriaceae, E. coli, staphylococci, Lactobacilli, Salmonella spp.).The following parameters were monitored during the experimental period: bodyweight (g); average daily feed intake (g feed/broiler/day); average daily weight gain (g/broiler/day); feed conversion ratio (g feed/g gain). Under heat stress (32 ºC), E2 broilers (mixture of A. annua oil and powder) had a significantly (p

摘要：本实验于恒温32°C、光照周期23小时的实验室内，对90只14日龄的 Cobb 500肉鸡进行了为期21天的饲养试验，并将它们分为三组（C组、E1组和E2组）。在生长阶段（14-35天）中，C组采用以玉米和豆粕为主要成分的传统饲料。与传统的饲料配方（C组）不同，实验组E1和E2的饲料配方中亦添加了0.005%的青蒿油（E1）以及0.005%的青蒿油与1%的青蒿粉末混合物（E2）。在35日龄时，每组选取6只肉鸡进行屠宰，以测量其尸体重量及内脏器官重量，并收集肠道和盲肠内容物进行细菌学评估（包括肠杆菌科、大肠杆菌、葡萄球菌、乳酸杆菌、沙门氏菌等）。在实验期间，监测了以下参数：体重（克）；平均日采食量（克饲料/鸡/日）；平均日增重（克/鸡/日）；饲料转化率（克饲料/克增重）。在高温应激（32°C）条件下，E2组（青蒿油与粉末混合）的肉鸡表现出显著差异（p