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鸡的产蛋期一般从19周龄起计算到72周龄,也就是从育成期结束后到母鸡产蛋率降到50%左右淘汰母鸡,这段时间约一年。现代蛋鸡产蛋期的阶段划分,大体上19~24周龄为产蛋前期(预产期),25~50周龄为产蛋高峰期,51~72周龄为产蛋后期。鸡群开始产第一个蛋的日期叫见蛋日龄,开始见蛋。见蛋不等于大群开产,产蛋率达到50%时才能代表全群开产, 相似文献
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产蛋下降综合症是青年母鸡的病毒性传染病,临床特征是产蛋鸡群不能如期达到产蛋高峰,或产蛋量大幅度下降,并伴有蛋壳的变化。 相似文献
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笼养产蛋母鸡饲养的动物福利问题 总被引:5,自引:0,他引:5
李凯年 《畜牧兽医科技信息》2005,(9):8-12
近几年来,全世界特别是发达国家对动物福利问题日益重视,保护动物福利的呼声日见高涨,动物福利作为生产实践活动一个明显决定因素的情况已经出现,关心维护动物福利正在从一种观念发展成为一项普遍的原则,甚至将动物福利作为动物性产品国际贸易的标准或壁垒。农场动物的动物福利问题主要表现在饲养、运输、屠宰过程中的方方面面,尤其受到关注。 相似文献
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为了实时了解鸡舍中鸡的健康状况,预防疫病的发生,设计出一种基于无线传感网络的哨兵鸡体温监测系统。基于DS18B20温度传感器和ESP8266无线通信模块设计了一款用于鸡舍内鸡只健康检测的哨兵鸡体温实时检测系统。系统中的体温监测节点采用ESP8266-12F为主控芯片,DS18B20温度传感器进行哨兵鸡翼下无毛区的体温监测,装置将采集到的体温数据实时发送到网关节点,在发送成功后进入深度休眠,网关转发数据到阿里云服务器并储存在数据库中,同时微信小程序读取数据库信息并进行显示,系统报警节点采用声光报警的方式,在接收到服务器信息后实时处理,并在发现问题后进行报警。结果表明,该系统能够有效地监测哨兵鸡的体温,并实现低功耗工作,且装置无线传输距离达到60 m,可以满足鸡舍无线通信的要求。基于无线传感网络的哨兵鸡体温实时监测系统运行稳定,功能完备,能够实现低功耗、低成本的特点,在数据超出阈值时能够及时报警,提高了鸡舍管理的效率和自动化水平。 相似文献
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为了找出最好的本地麻花鸡后备母鸡限制饲养方法,本文主要研究限饲时间和限饲量这两种限制饲养方法对本地麻花鸡后备母鸡生长发育的影响。1 350只麻花后备母鸡分为9个试验组,每组3个重复,每个重复50只,日粮饲喂量分别为标准料量的85%、75%和65%,限时方式分别为每天限饲、隔天限饲和喂二限一法。试验结果为:喂料量对后备期前期体重和产蛋期前期体重有较大影响,喂料量大则体重较大;喂法对后备期后期体重的影响显著,其中半天喂法体重最大。对冠高、体长等各体尺的控制主要看喂料量,喂料量越多冠高、胸深、胸宽越大;喂法基本上不影响体尺的生长发育。对20周龄死亡率,喂料量过多,喂料时间间隔太长,鸡群死亡率增加。每天限饲方法还能提高300日龄的产蛋率,延长产蛋高峰期。总的来说,对本地麻花后备母鸡的限制饲养,喂料量不宜过低,采用85%喂料量和每天限饲的方法较适宜。 相似文献
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鸡脂肪肝综合症又叫脂肪肝出血综合征,常发于产蛋母鸡的产蛋高峰期,是本县常见的一种慢性、营养代谢性疾病,尤其是笼养蛋鸡群,多数情况是鸡体况良好,发病初期并无临床表现,随着脂肪在肝脏中的不断聚集,随后才逐步表现出临床症状,如果未及时发现,会出现大面积死亡。死亡鸡腹腔及皮下大量脂肪蓄积,肝被膜下有血凝块为特征。公鸡极少发生。 相似文献
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SR92A系黄羽肉鸡与萧山鸡及其杂种后代的DNA指纹分析 总被引:2,自引:0,他引:2
本文以EAV(禽内源性反转录病毒片段 )为探针 ,EcoRI为限制性内切酶 ,对萧山鸡、SR92A系及其杂交后代进行了DNA指纹图谱的研究。结果表明 :EAV探针适合于鸡的DNA指纹分析 ,能产生清晰可辩的图谱。平均条带总数为11.384± 0 .84 4 ,两品种间、公母间条带总数均无显著差异。萧山鸡和SR92A系品种内相似系数分别为 0 .5 81、0 .5 11,高于品种间相似系数 (0 .2 31)。杂交后代相似系数为 0 .30 1。 相似文献
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Chicken immunoglobulins 总被引:4,自引:0,他引:4
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鸡白细胞介素2(IL-2)对鸡免疫功能的影响 总被引:10,自引:2,他引:10
为研究鸡IL-2对雏鸡免疫功能的影响,进行了3个方面的试验。①对体液免疫及细胞免疫的影响。结果表明,鸡IL-2能明显提高鸡新城疫疫苗免疫后HI水平、T淋巴细胞增殖反应及ANAE^+细胞百分数;②对雏鸡腹腔巨噬细胞吞噬功能的影响。结果表明使用IL-2与否对巨噬细胞的吞噬功能没有明显的影响;⑧人工感染法氏囊病的防治试验。在攻毒前后注射IL-2,均可明显降低发病率和死亡率。本研究结果表明,鸡IL-2可明显提高特异性免疫应答能力,与疫苗共同注射可作为佐剂提高疫苗的免疫原性,对法氏囊等病毒性疾病具有一定的防治作用。 相似文献
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S E Curtis 《Veterinary Clinics of North America: Food Animal Practice》1987,3(2):369-382
To know how to care for animals, one must understand their needs. Physiologic and safety needs of farm animals are reasonably well fulfilled. Behavioral needs have yet to be determined and used as bases for animal care. The concept of the welfare plateau is important for the design and operation of facilities for agricultural animals. Current issues in the care of farm animals include standard agricultural practices, stockmanship and the human-animal bond, and standards of design for animal-production equipment. 相似文献
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Psychological well-being of Australian veterinarians 总被引:1,自引:1,他引:0
Objective To use established psychological scales to measure levels of distress, anxiety and depression in veterinarians, and compare these levels between different veterinary subgroups and other professional groups.
Methods A cohort of veterinarians was identified through contact with veterinary schools in Australia. Participants completed a self-reporting questionnaire that included queries about general health and demographics, psychological well-being, job-specific perceptions of health, dispositional characteristics and social support.
Results Of the 2125 respondents who completed the psychological questionnaire, approximately one-third reported poor psychological health. Increasing age, increasing time in current job, increasing years since graduation and male gender was associated with fewer signs of distress, anxiety and depression. Compared with the general population, veterinarians experienced more negative emotions at work, but were similar to other professional groups.
Conclusions Poor psychological health is common in the profession and professional veterinary bodies may wish to consider providing training in dealing with work-related distress, anxiety and depression. 相似文献
Methods A cohort of veterinarians was identified through contact with veterinary schools in Australia. Participants completed a self-reporting questionnaire that included queries about general health and demographics, psychological well-being, job-specific perceptions of health, dispositional characteristics and social support.
Results Of the 2125 respondents who completed the psychological questionnaire, approximately one-third reported poor psychological health. Increasing age, increasing time in current job, increasing years since graduation and male gender was associated with fewer signs of distress, anxiety and depression. Compared with the general population, veterinarians experienced more negative emotions at work, but were similar to other professional groups.
Conclusions Poor psychological health is common in the profession and professional veterinary bodies may wish to consider providing training in dealing with work-related distress, anxiety and depression. 相似文献