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首页> 外文期刊>Tropical Animal Health and Production >Energy sources and levels influenced on performance parameters, thyroid hormones, and HSP70 gene expression of broiler chickens under heat stress
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Energy sources and levels influenced on performance parameters, thyroid hormones, and HSP70 gene expression of broiler chickens under heat stress

机译：能量来源和水平对热应激条件下肉鸡生产性能参数，甲状腺激素和HSP70基因表达的影响

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摘要

The present study was conducted to evaluate the effects of energy sources and levels on body and organs weights, thyroid hormones, and heat shock protein (HSP70) gene expression in broilers under heat stress. In a completely randomized design, 600 1-day-old Cobb chickens were assigned to five dietary treatments and four replicates. The chickens were fed diet based on corn as main energy source and energy level based on Cobb standard considered as control (C), corn-based diet with 3 % lesser energy than the control (T1), corn-based diet with 6 % lesser energy than the control (T2), corn and soybean oil-based diet according to Cobb standard (T3), and corn and soybean oil-based diet with 3 % upper energy than the control (T4). Temperature was increased to 34 A degrees C for 8 h daily from days 12 to 41 of age to induce heat stress. The chickens in T1 and T2 had lower thyroid hormones and corticosterone levels than those in C, T3, and T4. The highest liver weight was for C and the lowest one was for T4. The highest gene expression was found in chickens fed T4 diet, and the lowest gene expression was for those in T2 group. The highest feed intake and worse feed conversion ratio was related to chickens in T2. The chickens in T3 and T4 had higher feed intake and weight gain than those in C. The results showed that the higher energy level supplied from soybean oil could enhance gene expression of HSP70 and decline the level of corticosterone and thyroid hormones and consequently improved performance.
机译：本研究旨在评估能量源和水平对热应激条件下肉仔鸡体重和器官重量，甲状腺激素和热休克蛋白（HSP70）基因表达的影响。在完全随机的设计中，将600只1天大的Cobb鸡分配到五种饮食疗法中，并重复四次。给鸡饲喂以玉米为主要能源的日粮，并根据Cobb标准将能量水平视为对照（C），以玉米为基础的日粮要比对照（T1）少3％，以玉米为基础的日粮要少6％。能量比对照（T2）高，根据Cobb标准（T3）的玉米和大豆油基饮食，以及比对照（T4）高3％的玉米和大豆油基饮食。从12岁到41岁之间，每天将温度升高到34 A摄氏度，持续8 h，以诱导热应激。 T1和T2的鸡的甲状腺激素和皮质酮水平低于C，T3和T4的鸡。肝重最高的是C，最低的是T4。在饲喂T4日粮的鸡中发现最高的基因表达，而在T2组中则最低。最高采食量和较差的饲料转化率与T2中的鸡有关。 T3和T4鸡的采食量和体重增加均高于C鸡。结果表明，豆油提供的较高能量水平可以增强HSP70的基因表达，并降低皮质酮和甲状腺激素的水平，从而改善性能。

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