Department of Animal Physiology, Faculty of Animal Science, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan 4918943464, Iran; Research and Development Department, Kianpharmino Group Co., Amol, Mazandaran 4616617357, Iran.
Poultry Science Department, College of Agriculture, Tarbiat Modares University, Tehran 14115336, Iran.
Poult Sci. 2021 Sep;100(9):101344. doi: 10.1016/j.psj.2021.101344. Epub 2021 Jun 26.
The unprecedented rate of global warming requires more immaculate strategies to fight the heat stress and its detrimental effects on poultry sector. Nutritional strategies, particularly herbal extracts, play a crucial importance in this scenario. Therefore, this study was conducted to evaluate the effects of a novel selected mixture (hereafter refers to as Stress-Bio-Max, SBM) comprising St John's wort, lavender, Melissa officinalis extracts, betaine, and Vit C on heat-stressed broilers. A total of 300 male broiler chicks were allocated to 4 treatments: T1, Control (no SBM in drinking water); T2, 0.25 mL/L of SBM in drinking water; T3, 0.5 and T4, 1 mL/L of SBM, which applied since d 32. The birds underwent heat stress (40 ± 1) daily from d 35 to 42 of the experiment (2 pm-8 pm). The results show the superior weight gain of T2 and T3 from d 7 to 42 compared to other groups, 72.5 and 72.7 g/d, respectively (P < 0.05). Corticosterone level was higher on d 35 in T1 (4.674 ng/mL, P < 0.05) and lower in T2 and T3 (2.64 and 2.952 ng/mL, respectively, P < 0.05); T2 and T3 also caused the lowest concentrations of corticosterone on d 40 (5.198 and 6.458 ng/mL, respectively, P < 0.05). The superior triiodothyronine levels belonged to T2 (0.935 ng/mL, P < 0.05) on d 35 and T2 and T3 on d 40 (0.699 and 0.582 ng/mL, respectively, P < 0.05). T2, T3, and T4 caused a rise in glutathione peroxidase (GPX) and superoxide dismutase (SOD) activities (P < 0.05). A significant higher amount of total antioxidant capacity (TAC) belonged to the groups treating with SBM (P < 0.05). The SBM in T2 and T3 resulted in the lowest levels of malondialdehyde (MDA), aspartate transaminase (AST), alanine aminotransferase (ALT), and alkaline phosphatase (ALP). Results from this study indicate that SBM may alleviate the negative impacts associated with heat stress in broiler chickens.
全球变暖的速度前所未有，因此需要更完善的策略来应对热应激及其对家禽业的不利影响。营养策略，特别是草药提取物，在这种情况下起着至关重要的作用。因此，进行了这项研究，以评估一种新型选择混合物（以下简称 SBM）对热应激肉鸡的影响，该混合物包含贯叶连翘、薰衣草、柠檬香蜂草提取物、甜菜碱和维生素 C。共有 300 只雄性肉鸡被分配到 4 个处理组：T1，对照组（饮用水中不含 SBM）；T2，饮用水中添加 0.25 mL/L 的 SBM；T3 和 T4，饮用水中添加 0.5 和 1 mL/L 的 SBM，从第 32 天开始应用。从第 35 天到实验的第 42 天（下午 2 点至 8 点），鸟类每天经历（40±1）℃的热应激。结果显示，与其他组相比，T2 和 T3 从第 7 天到第 42 天的体重增加分别为 72.5 和 72.7 g/d，差异有统计学意义（P<0.05）。T1 组在第 35 天的皮质酮水平较高（4.674ng/mL，P<0.05），T2 和 T3 组较低（分别为 2.64 和 2.952ng/mL，P<0.05）；T2 和 T3 组在第 40 天的皮质酮浓度也较低（分别为 5.198 和 6.458ng/mL，P<0.05）。T2 组（0.935ng/mL，P<0.05）在第 35 天和 T2 组和 T3 组（0.699 和 0.582ng/mL，分别，P<0.05）的三碘甲状腺原氨酸水平最高。T2、T3 和 T4 组的谷胱甘肽过氧化物酶（GPX）和超氧化物歧化酶（SOD）活性升高（P<0.05）。具有总抗氧化能力（TAC）的 SBM 组数量明显更高（P<0.05）。T2 和 T3 组的丙二醛（MDA）、天门冬氨酸氨基转移酶（AST）、丙氨酸氨基转移酶（ALT）和碱性磷酸酶（ALP）水平最低。这项研究的结果表明，SBM 可能减轻了肉鸡热应激带来的负面影响。
