A Survey on Electrocardiographic Parameters in Broiler Chickens Following the Intracerebroventricular Injection of Melatonin

Q4 Veterinary Iranian Journal of Veterinary Surgery Pub Date : 2019-10-01 DOI:10.22034/IVSA.2019.193791.1190

M. Taati, H. Norouzian, A. Raisi

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Abstract

Objective- The pineal gland and its principal hormone melatonin play an important role in the circadian organization in birds. However, little is known about the role of melatonin in cardiac activity of broiler chicken. The aim of this study was to assess the impact of intracerebroventricular injection of melatonin in electrocardiographic parameters, heart rate and mean electrical axis in broiler chickens. Design- Experimental study. Animals- Forty male Ross broiler chickens Procedures- Ross broiler chickens received intracerebroventricularly (ICV) melatonin. All ECGs were standardized at 1 mV = 20 mm, with paper speed of 50 mm/sec. Leads І, ІІ, ІІІ, aVR, aVL and aVF were recorded. Results- Injection of melatonin (200 nmol) increased the duration of T wave and QRS complex and declined the heart rate as compared to the control group (p<0.05). Mean electrical axis, calculated from leads ІІ and ІІІ, did not differ between groups and it was between -93° and -99° in all chickens. Conclusion and clinical relevance- Exogenous melatonin intracerebroventricularly results in sinusoidal bradycardia in broiler chicken

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侧脑室注射褪黑素对肉鸡心电图参数的影响

目的——松果腺及其主要激素褪黑素在鸟类的昼夜节律组织中起着重要作用。然而，人们对褪黑激素在肉鸡心脏活动中的作用知之甚少。本研究的目的是评估侧脑室注射褪黑素对肉鸡心电图参数、心率和平均电轴的影响。设计——实验研究。动物-40只雄性罗斯肉鸡程序-罗斯肉鸡接受侧脑室内（ICV）褪黑素。所有心电图均在1mV=20mm标准化，纸速为50mm/s。记录导联、导联、导联aVR、导联aVL和导联aVF。结果-与对照组相比，注射褪黑素（200 nmol）增加了T波和QRS波的持续时间，并降低了心率（p<0.05）。根据导联和导联计算的平均电轴在各组之间没有差异，所有鸡的平均电轴线在-93°和-99°之间。结论和临床相关性——侧脑室内外源性褪黑素导致肉鸡窦性心动过缓

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