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首页> 外文期刊>Spanish Journal of Agricultural Research >Comparison of growth performance and immune responses of broiler chicks reared under heat stress, cold stress and thermoneutral conditions
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Comparison of growth performance and immune responses of broiler chicks reared under heat stress, cold stress and thermoneutral conditions

机译：热应激，冷应激和热中性条件下饲养的肉鸡生长性能和免疫反应的比较

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This study was conducted to compare the effects of thermal stress on growth performance and some immunity variables of broiler chickens. Birds were randomly assigned to one of three thermal treatments as follows: cold stress (CS, 12±1 ° C), (b) heat stress (HS, 33±3 ° C) and (c) thermoneutral (TN, 24±2 ° C). Body weight gain (BWG), feed intake (FI), water intake (WI) and feed conversion ratio (FCR) were recorded. In order to evaluate the primary and secondary humoral immune responses, two birds per replicate were intravenously administrated with a suspension of 7% sheep red blood cell (SRBC) at 28 and 35 days. The heat-stressed broiler chickens had lower FI (-14.90%), BWG (-25.71%) and higher FCR (+13.06%) in comparison to broiler chickens reared under TN condition ( p 0.001) from 1 to 42 days of age. The cold-stressed broiler chickens showed lower FI (-22.05%), BWG (-38.32%) and higher FCR (+22.47%) in comparison to birds reared under TN conditions ( p 0.001). Stressed birds (CS and HS) showed decreased antibody titer against SRBC, lymphocyte count and the relative weights of lymphoid organs and increased heterophil count, heterophil to lymphocyte ratio and the serum concentration of corticosterone, in comparison to birds in TN group ( p 0.001). In conclusion, HS and CS conditions have similar negative effects on performance and immunity of broiler chickens.
机译：进行这项研究以比较热应激对肉鸡生长性能和一些免疫变量的影响。将鸟类随机分配给以下三种热处理之一：冷应激（CS，12±1°C），（b）热应激（HS，33±3°C）和（c）热中性（TN，24±2） °C）。记录体重增加（BWG），饲料摄入量（FI），水摄入量（WI）和饲料转化率（FCR）。为了评估主要和次要的体液免疫反应，每只重复的两只鸟在28天和35天时静脉内注射7％绵羊红细胞（SRBC）悬浮液。与在TN条件下饲养1至42天的肉鸡相比，热应激肉鸡的FI（-14.90％），BWG（-25.71％）和FCR（+ 13.06％）较高（p <0.001） 。与在田间条件下饲养的家禽相比，冷应激肉鸡的FI值较低（-22.05％），BWG（-38.32％）和FCR较高（+ 22.47％）。与TN组相比，受应激的鸟类（CS和HS）显示出针对SRBC的抗体滴度降低，淋巴细胞计数和淋巴器官的相对重量降低，异源性计数，异源性淋巴细胞比值和皮质酮的血清浓度升高（p <0.001 ）。总之，HS和CS条件对肉鸡的性能和免疫性具有相似的负面影响。

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