Olkowski A A, Classen H L, Riddell C, Bennett C D
Department of Animal and Poultry Science, University of Saskatchewan, Saskatoon, Canada.
Vet Res Commun. 1997 Jan;21(1):51-62. doi: 10.1023/b:verc.0000009701.75985.cb.
A study was completed to characterize the electrocardiographic (ECG) patterns of male broiler chickens. Data were collected from 300 commercial broilers. ECG readings were collected from all birds between 12 and 15 days of age and then twice more at 10-day intervals. The measurements. included heart rate and rhythm, QRS complex duration, amplitude and mean electrical axis (MEA), incidence of ascites and incidence of sudden death syndrome (SDS). Eight birds died from SDS and 4 birds died from ascites. Twelve birds were condemned for ascites at the processing plant. The overall population heart rate declined with age. Birds that died of SDS had a higher heart rate, whereas those that developed ascites had a lower heart rate than the remainder of the population. The normal MEA was found to be between 0 degree and 180 degrees. On average 30% of birds showed left or right QRS axis deviation, and this pattern was observed in 14 of the 16 birds that developed ascites. Several types of cardiac arrhythmias were observed, the most common being premature ventricular contractions (PVC). The incidence of PVC increased with age, ranging from 1% at 12-15 days of age to 8.9% at 32-35 days of age. QRS axis deviation was present in 5 SDS birds. It is concluded that some 30% of the broiler flock tested was at risk of developing heart failure or heart-related disease.
一项旨在描述雄性肉鸡心电图（ECG）模式的研究已完成。数据收集自300只商品肉鸡。在12至15日龄时收集所有鸡的心电图读数，然后每隔10天再收集两次。测量指标包括心率和心律、QRS波群持续时间、振幅和平均电轴（MEA）、腹水发病率和猝死综合征（SDS）发病率。8只鸡死于SDS，4只鸡死于腹水。12只鸡在加工厂因腹水被判定不合格。总体鸡群的心率随年龄下降。死于SDS的鸡心率较高，而患腹水的鸡心率低于其余鸡群。正常MEA在0度至180度之间。平均30%的鸡出现左或右QRS轴偏移，在16只患腹水的鸡中有14只观察到这种模式。观察到几种类型的心律失常，最常见的是室性早搏（PVC）。PVC的发病率随年龄增加，从12至15日龄时的1%增至32至35日龄时的8.9%。5只患SDS的鸡出现QRS轴偏移。结论是，所测试的肉鸡群中约30%有发生心力衰竭或心脏相关疾病的风险。
