相对湿度对递增性偏热环境下肉鸡体热调节及下丘脑热休克蛋白70含量的影响
发布时间:2019-05-27 06:44
【摘要】:本试验旨在研究相对湿度(RH)对递增性偏热环境下肉鸡体热调节及下丘脑热休克蛋白70(HSP70)含量的影响。选取21日龄爱拔益加(AA)肉鸡180只转入环境控制舱,随机分成3组,每组6个重复,每个重复10只鸡(公母各占1/2)。预试期7 d,温度20℃,RH 60%。正试期15 d,28日龄开始试验,将3组的RH分别调整到35%、60%和85%,温度仍为20℃;3 d为1周期,共分5个周期,从第2周期开始每周期的第1天将3组的温度均在10:00开始升高3℃并在0.5 h内达到稳定;5个周期的温度分别为20、23、26、29和32℃。结果表明:1)85%RH组肉鸡的呼吸频率极显著高于60%RH和35%RH组(P0.01),60%RH组的呼吸频率极显著高于35%RH组(P0.01);85%RH组肉鸡的体核温度显著高于60%RH组(P0.05);35%RH组肉鸡小腿和脚蹼的皮肤温度极显著高于60%RH和85%RH组(P0.01),35%RH和60%RH组肉鸡鸡冠、耳垂和眼睑的皮肤温度极显著高于85%RH组(P0.01)。2)85%RH组肉鸡的血清碱性磷酸酶(AKP)活性显著高于35%RH和60%RH组(P0.05);35%RH和85%RH组肉鸡的血清肌酸激酶(CK)活性显著高于60%RH组(P0.05)。RH对递增性偏热环境下肉鸡的血清谷草转氨酶(AST)和乳酸脱氢酶(LDH)活性无显著影响(P0.05)。3)85%RH组肉鸡的血清三碘甲腺原氨酸(T3)含量显著高于35%RH组(P0.05);35%RH和85%RH组肉鸡的血清甲状腺素(T4)含量显著高于60%RH组(P0.05);60%RH和85%RH组肉鸡的血清皮质酮(CORT)含量极显著高于35%RH组(P0.01)。4)35%RH组肉鸡下丘脑HSP70含量显著低于60%RH和85%RH组(P0.05)。综上所述,在为期15 d的20~32℃递增性偏热环境下,高湿(85%)和低湿(35%)调节28~42日龄肉鸡体热平衡的途径和程度不同。
[Abstract]:The purpose of this study was to study the effects of relative humidity (RH) on body heat regulation and Hypothalamic heat shock protein 70 (HSP70) content in broilers under progressive partial heat environment. 180 21-day-old Ebayi plus (AA) broilers were randomly divided into 3 groups with 6 repeats in each group and 10 chickens in each group (male and female accounted for 1 鈮,
本文编号:2485964
[Abstract]:The purpose of this study was to study the effects of relative humidity (RH) on body heat regulation and Hypothalamic heat shock protein 70 (HSP70) content in broilers under progressive partial heat environment. 180 21-day-old Ebayi plus (AA) broilers were randomly divided into 3 groups with 6 repeats in each group and 10 chickens in each group (male and female accounted for 1 鈮,
本文编号:2485964
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