High incidence of cardiac arrhythmias in broiler chickens
High incidence of cardiac arrhythmias in broiler chickens
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DOI：
10.1111/j.1439-0442.1998.tb00804.x
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发表时间：
1998-03-01
期刊：
影响因子：
--
通讯作者：
Classen, HL
中科院分区：
文献类型：
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作者：
Olkowski, AA;Classen, HL
完成了一项肉鸡心律失常特征的研究。数据采集自505只商品肉鸡（公鸡265只，母鸡240只）。在7 - 9日龄、21 - 23日龄和42 - 44日龄的所有雏鸟的心电图（ECG）读数均被获取。为了进行比较，还收集了180只3周龄和8周龄的肉种鸡，以及100只6周龄的布朗来霍恩鸡和100只6周龄的白斑普利茅斯岩鸡的心电图记录。测量包括心律、腹水和猝死综合征（SDS）的发生率。在肉鸡种鸡和其他两个品种中，心律失常是散发性的。肉仔鸡早在7日龄时就出现心律失常。心律失常的发生率随年龄增长而增加。42 ~ 44日龄时，17%的肉鸡出现心律失常。雄性肉鸡的发病率高于雌性（P < 0.012）。最常见的心律失常是室性心律失常（VA），最常见的是室性早搏（PVC）。在大多数情况下，聚氯乙烯发生一次或两次发作，但在一些鸟类中，连续发生三次或更多的聚氯乙烯。单灶性室性早搏明显多于多灶性室性早搏。持续性室性心动过速（VT）发生率最低。心脏相关死亡仅在肉鸡中观察到。SDS 23例（4.55%），腹水13例（2.25%）。肉鸡SDS发生率（P < 0.027）和腹水发生率（P = 0.064）均高于母鸡。男性占所有SDS病例的74%，占所有腹水病例的77%。3只死于SDS的鸟和1只发生腹水的鸟有VA病史，而5只发生腹水的鸟有传导阻滞的病史。由此得出结论，与其他鸡相比，肉鸡的心脏更容易发生心律失常。心律不齐参与SDS的发病机制，并可能在一些腹水的情况下。
A study was completed to characterize cardiac arrhythmias in broiler chickens. The data were collected from 505 (265 males and 240 females) commercial broilers. Electrocardiograph (ECG) readings were obtained from all birds between 7 and 9, 21 and 23, and 42 and 44 days of age. For comparison, ECG recordings were also collected from 180 broiler breeders at 3 weeks and 8 weeks of age, and from 100 6-week-old Brown Leghorn and 100 6-week-old Barred Plymouth Rock chicks. The measurements included evaluation of heart rhythm, and incidence of ascites and of sudden death syndrome (SDS). Heart arrhythmias in broiler breeders or in the two other breeds examined were sporadic. Cardiac arrhythmias in broiler chickens were seen as early as 7 days of age. The incidence of arrhythmias increased with age. At 42-44 days of age 17% of the broiler population showed disrhythmia. The incidence was higher in male broilers (P < 0.012) in comparison to females. The most frequently observed disturbances of the rhythm were ventricular arrhythmias (VA), the most common being premature ventricular contractions (PVC). In most cases PVC occurred as one or two episodes, but in several birds, runs of three or more consecutive PVCs occurred. Unifocal PVCs were considerably more frequent than multifocal PVCs. Sustained ventricular tachycardia (VT) was least frequent. Heart-related mortalities were observed only in broiler chickens. There were 23 SDS cases (4.55% of the population) and 13 birds developed ascites (2.25% of the population). Male broilers had a higher incidence of SDS (P < 0.027) and ascites (P = 0.064) compared to females. Males represented 74% of all SDS cases and 77% of all ascites cases. Whereas three birds that died of SDS and one bird that developed ascites had a history of VA, five birds that developed ascites had a history of conduction block. It has been concluded that, compared to other chickens, the hearts of broiler chickens are considerably more susceptible to arrhythmias. Cardiac arrhythmias are involved in the pathogenesis of SDS and are likely in some cases of ascites.