摘要:随着养殖集约化程度的加强,笼养蛋鸡瘫痪综合征成为蛋鸡养殖生产中常见的疾病,增加了蛋鸡的死淘率,造成严重的经济损失。笼养蛋鸡瘫痪综合征不是一种单独的疾病,是由于多种病因相互作用引起的一种病症。该文根据蛋鸡发病情况,详细调查发病因素,并给出有效的防控措施,以期推动蛋鸡养殖业的健康发展。
关键词:笼养蛋鸡瘫痪综合征;病因;防控
中图分类号:S858.31 文献标识码:B doi:10.3969/j.issn.2096-3637.2021.21.053
Etiology and Prevention of Paralysis Syndrome in Cage Laying Hens
Abstract:With the intensification of breeding,paralysis syndrome of caged laying hens has become a common disease in laying hens breeding,which increases the death rate of laying hens and causes serious economic losses.Paralysis syndrome of caged laying hens is not a single disease,but a disease caused by the interaction of various causes.In this paper,according to the local incidence,the pathogenic factors were investigated in detail,and effective prevention and control measures were given,so as to promote the healthy development of laying hen breeding industry.
Keywords:paralysis syndrome of caged laying hens,etiology,prevention and control
引言
规模化、集约化笼养模式成为蛋鸡养殖的主流,集约化程度的加强促使笼养蛋鸡瘫痪综合征的发病率出现上升的趋势,给养殖户带来严重的损失。该病典型的特征是病鸡两腿软弱无力,跛行,严重的卧地不起,呈瘫痪状。该病发生没有季节性,炎热的季节发病率较高,多集中在5—9月发病。
1 病因
1.1 传染性疾病
(1)新城疫、禽流感是蛋鸡养殖场发病率较高的病毒性疾病,传播方式较多,鸡群容易感染发病。随着养殖户防疫意识的增强,都会对鸡群进行免疫,但是鸡群是否感染发病和免疫的好坏有很大的关系,如有的养殖场免疫次数过多,引起免疫抑制;有的操作不规范,疫苗剂量不足,免疫抗体水平不高,不能抵抗病毒的侵袭。马立克氏病是由疱疹病毒引起的淋巴细胞增生性肿瘤疾病,多在幼雏期感染,潜伏期比较长,多为4周左右,甚至有的长达几个月,发病高峰为4~20周。发病后典型的特征就是一肢或者两肢麻痹或者瘫痪,呈现劈叉姿势。
(2)细菌性疾病中以大肠杆菌病、慢性呼吸道病发病率较高。……