EFFECT OF TWO CHEMOTYPES OF OREGANO ESSENTIAL OIL ON BROILER PERFORMANCE, NUTRIENT BALANCE, AND LIPID PEROXIDATION OF BREAST MEAT DURING STORAGE

Abstract This study evaluated the functional effects of two chemotypes of oregano essential oil (OEO): Lippia Origanoides (LO) and a comercial product Synergy Essence (SE). Broilers were randomly assigned to one of eight dietary treatments: 1) Basal diet (BD); 2) BD+ antibiotic growth promoters (AGP) (bacitracin 50g/ton); 3) BD+LO125 (125g/ton); 4) BD+LO250 (250g/ton); 5) BD+LO500 (500g/ton); 6) BD+SE125 (125g/ton); 7) BD+SE250 (250g/ton); 8) BD+SE500 (500g/ton). At the time of slaughter (42 d), five birds per treatment were slaughtered. A portion of the breast was minced and stored at -4 ºC for 3, 6, and 9 days. Lipid peroxidation was determined by measuring of malondialdehyde (MDA), data were analyzed as a completely randomized design with a factorial arrangement of treatments (8x4). Broilers fed SE250 had greater average daily gain (ADG) compared to broilers fed BD (P<0.05). Broilers fed LO500 had greater (P<0.05) organic matter digestibility than the ones fed BD. As days of storage increased, MDA concentration increased (P<0.05). Broilers fed SE500 had lower (P<0.05) MDA concentration than those fed BD and AGP. These data indicate that birds fed OEO grow faster than those fed a BD, similar to birds fed AGP. Some of these responses are possibly explained by increased digestibility and energy utilization. In addition, providing OEO from SE at 500g/ton resulted in lower lipid peroxidation in ground breast meat throughout the tested storage time.

摘要 本研究评估了两种化学型牛至精油（Oregano Essential Oil, OEO）的功能效应：直茎牛至（Lippia Origanoides, LO）与商品制剂协同精华（Synergy Essence, SE）。试验将肉鸡随机分为8种日粮处理组：1）基础日粮组（BD）；2）基础日粮+抗生素生长促进剂（Antibiotic Growth Promoters, AGP）组（添加杆菌肽50g/吨）；3）基础日粮+LO125组（添加量125g/吨）；4）基础日粮+LO250组（添加量250g/吨）；5）基础日粮+LO500组（添加量500g/吨）；6）基础日粮+SE125组（添加量125g/吨）；7）基础日粮+SE250组（添加量250g/吨）；8）基础日粮+SE500组（添加量500g/吨）。于42日龄屠宰当日，每组屠宰5只肉鸡。取部分胸肌组织绞碎后，于-4℃分别储存3、6、9天。通过测定丙二醛（Malondialdehyde, MDA）含量来表征脂质过氧化水平，试验数据采用8×4因子排列的完全随机设计进行统计分析。结果表明，饲喂SE250组肉鸡的平均日增重（Average Daily Gain, ADG）显著高于基础日粮组（P<0.05）。饲喂LO500组肉鸡的有机物消化率显著高于基础日粮组（P<0.05）。随着储存天数延长，胸肌MDA含量显著升高（P<0.05）。饲喂SE500组肉鸡的MDA含量显著低于基础日粮组与抗生素生长促进剂组（P<0.05）。上述研究数据显示，饲喂牛至精油组的肉鸡生长速度显著快于基础日粮组，其生长效果与饲喂抗生素生长促进剂组相当。部分生长性能的提升可能与有机物消化率及能量利用率的提高有关。此外，以500g/吨的添加量添加源自SE的牛至精油，可在整个试验储存周期内降低绞碎胸肌的脂质过氧化水平。