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首页> 外文期刊>Zootecnia Tropical >Heart rate as an indicator of heat stress in broilers
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Heart rate as an indicator of heat stress in broilers

机译：心率是肉鸡热应激的指标

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Experiments were conducted in a semi-controlled environmental condition, to assess heart rate (HR) as an indicator of heat stress (HS) in broilers. Thirty two broilers (Hubbard) were used. Chickens were identified by sex and were allocated to two treatments: treatment 1 (T1); hot room and treatment 2 (T2); fresh room. Each group was constituted by 16 broilers (eight males and eight females). Chickens from each treatment were placed in four fences (repetitions) per treatment of four broilers per repetition. The fresh room was characterized by a maximum environmental temperature (ET) of 30C during the experimental phase, while the maximum ET of the hot room was 32C. Both, body temperature (BT) and ET were measured (four times a day) for seven days between 28 and 35 days old. The body weight (BW) and HR (beats/min) was measured on days 28 and 35. The BT was similar (P >0,05) between treatments (T1: 41,430,05C vs T2: 44,500,05C). The HR of broilers from T1 was significantly (P <0,05) lower than T2 (T1: 345,82,9 lat/min vs T2: 353,92,5 lat/min). No significant differences were observed in HR between sexes, although males tended to have a lower HR. It is concluded that HR could be a sensible variable to determine the moderate HS level in broilers under an average ET between 30 and 32C. It is recommended to include the HR to study variations in the level of heat stress in broilers.
机译：在半控制的环境条件下进行实验，以评估心率（HR）作为肉鸡热应激（HS）的指标。使用了32只肉鸡（Hubbard）。按性别鉴定鸡并分配给它们两种治疗方法：治疗1（T1）;热水室和治疗2（T2）;新鲜的房间。每组由16只肉鸡组成（雄性8只，雌性8只）。每次处理将鸡放在四个围栏（重复）中，每次处理将四个肉鸡放在一个围栏中。在实验阶段，新鲜室的最大环境温度（ET）为30°C，而热室的最大环境温度（ET）为32°C。在28至35天之间的7天中，每天（四次）测量体温（BT）和ET。在第28天和第35天测量体重（BW）和HR（次/分钟）。治疗之间的BT相似（P> 0.05）（T1：41,430,05C vs T2：44,500,05C）。来自T1的肉鸡的HR显着（P <0.05）低于T2（T1：345,82,9 lat / min vs T2：353,92,5 lat / min）。尽管男性倾向于较低的心率，但是在性别之间的心率上没有观察到显着差异。结论是，在平均ET介于30和32C之间的情况下，HR可能是确定肉鸡中HS含量的明智变量。建议包括HR，以研究肉鸡热应激水平的变化。

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