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1.
部分蛋鸡养殖户在生产中可能会遇到这样的情况，即后备鸡培育很好，体重、均匀度都达标，但是产蛋期间鸡群到不了产蛋高峰，仔细检查鸡群发现，部分鸡根本就不能产蛋，我们称之为“假母鸡”。发生原因是雏鸡在1－2周龄内感染生殖型传染性支气管炎，造成输卵管不发育或间断性发育。蛋鸡外观无异常，产蛋前不易被发现，只有产蛋期才能被发现，用抗菌素治疗无效。 相似文献
2.
25．4 疾病与药物的影响
鸡传染性气管炎、鸡新城疫、鸡白痢、肠炎，以及破坏生殖系统的其他疾病．也会使鸡产薄壳蛋或软壳蛋。为了预防鸡病，须按免疫程序及时接种鸡新城疫疫苗、鸡传染性气管炎疫苗、产蛋下降综合征疫苗、禽霍乱菌苗等；定期服用驱虫药。鸡群密度过大。环境卫生不良和受惊吓等，均可导致鸡产薄壳蛋或软壳蛋。因此，鸡群在产蛋期间，应尽量避免各种不良应激因素的发生，以保证产蛋质量和经济效益的提高。 相似文献
3.
在蛋鸡生产中,产蛋下降是困扰蛋鸡生产的一个顽症,患病鸡群主要表现为群发性产蛋下降、产蛋异常、蛋体畸形、蛋质低劣等,其病因比较复杂,可分为环境因素、疫病因素、饲料因素、饲养管理因素、药物因素,其中以传染性疫病尤其是病毒性疫病危害最大,常呈大面积的地方性和流行性感染,容易造成误诊。本文从发病特点、临床症状、病理变化等方面进行分析、诊断介绍非典型鸡新城疫、禽流感、传染性支气管炎、传染性喉气管炎、减蛋综合症、鸡病毒性关节炎、鸡脑脊髓炎引起的蛋鸡产蛋下降综合症的鉴别诊断方法要点,希望能在疫病防控中为广大养鸡户和基层兽医工作者提供一些帮助。 相似文献
4.
在蛋鸡生产中,产蛋下降是困扰蛋鸡生产的一个顽症,患病鸡群主要表现为群发性产蛋下降、产蛋异常、蛋体畸形、蛋质低劣等,其病因比较复杂,可分为环境因素、疫病因素、饲料因素、饲养管理因素、药物因素,其中以传染性疫病尤其是病毒性疫病危害最大,常呈大面积的地方性和流行性感染,容易造成误诊。本文从发病特点、临床症状、病理变化等方面进行分析、诊断介绍非典型鸡新城疫、禽流感、传染性支气管炎、传染性喉气管炎、减蛋综合症、鸡病毒性关节炎、鸡脑脊髓炎引起的蛋鸡产蛋下降综合症的鉴别诊断方法要点,希望能在疫病防控中为广大养鸡户和基层兽医工作者提供一些帮助。 相似文献
5.
在养蛋鸡的生产过程中,有的养鸡户看到自己的鸡群进入产蛋旺期,害怕鸡感染传染病影响产蛋,就给鸡接种(肌肉注射)新城疫苗、传染性支气管炎疫苗等。殊不知,这样做不但收不到好的效果,还会引起鸡产蛋下降,产软壳蛋和影响鸡体健康的反作用。 鸡是否产蛋和产蛋多少,除了与饲养的好坏和营养状况有关外,还受季节和气候的影响。春夏特别是 相似文献
6.
<正> 在产蛋鸡的生产过程中,有的养鸡户看到自己的鸡群进入产蛋旺期,害怕鸡感染传染病影响产蛋,就给鸡接种(肌肉注射)新城疫苗、传染性支气管炎疫苗等。殊不知,这样做不但收不到好的效果,还会引起鸡产蛋下降,产软壳蛋和影响鸡体健康的反作用。鸡是否产蛋和产蛋多少,除了与饲养的好坏和营养状况有关外,还受季节和气候的影响。春夏特别 相似文献
7.
鸡传染性支气管炎是由冠状病毒属的鸡传染性支气管炎病毒引起的鸡急性、高度接触性传染病。本病可致雏鸡和幼鸡大批死亡，严重影响成鸡的产蛋性能和蛋的质量，对养鸡业危害极大。 相似文献
8.
鸡传染性鼻炎（IC）是由鸡嗜血杆菌引起的一种急性呼吸道疾病。传染性鼻炎造成的经济损失是有成鸡生长不良和产蛋明显下降10％。在种鸡开产前发病会造成种鸡产蛋上高峰慢、高峰产蛋低于标准蛋率2％－4％,使种鸡生产性能下降、死淘增加等。在中国传染性鼻炎的发病率可达20％－50％,死亡率可达5％－20％。因此作为任何一个种鸡场都应重视该病的防治。 相似文献
9.
产蛋性能低下,主要表现为到高峰期的鸡没有出现产蛋高峰,饲养至200日龄左右时日产蛋率还在60%~80%徘徊,或者虽上了高峰期,但维持的时间太短。产蛋异常下降主要表现为蛋鸡在产蛋期间产蛋率的急剧下降和缓慢下降。1产蛋高峰期不高或维持时间短育雏期发生肾型传染性支气管炎或衣原体感染。育雏期发生肾型传染性支气管炎后产蛋鸡的卵泡发育正常而输卵管发育严重异常、缺失,导致无法 相似文献
10.
1 疾病与药物的影响 鸡传染性支气管炎、鸡新城疫、鸡白痢、肠炎,以及破坏生殖系统的其他疾病,会使鸡产薄壳蛋或软壳蛋.为了预防鸡病,须按免疫程序及时接种鸡新城疫疫苗、鸡传染性支气管炎疫苗、产蛋下降综合征疫苗等;定期服用驱虫药,鸡群在产蛋期间,应尽量避免各种不良应激因素的发生,以保证免疫的效果. 相似文献
11.
In late December 1984, 1853 institutional veterinarians and small and mixed animal clinics across Canada were sent a questionnaire in order to assess the status of Dirofilaria immitis in Canada in 1984 and 35% of them responded. Veterinarians reported that 97,794 dogs were blood-tested to check for microfilariae and 1417 dogs (1.45% of those tested) were found with heartworm. Another 34 dogs were amicrofilaremic, but were diagnosed as having heartworm disease, to give the total number diagnosed in 1984 as 1451 (1.48%). Heartworm was reported from all provinces except Prince Edward Island and Newfoundland but most (1310) of the cases were in Ontario. In Quebec, 126 cases were reported mostly from west of Montreal. Heartworm was found most frequently in companion dogs over three years of age maintained mainly outdoors in rural areas. About 27% of the cases were observed with clinical signs of heartworm disease and 72% had a history of not having left Canada. Southwestern Ontario continued to be the primary focus of the infection. 相似文献
13.
In late December 1983, 2 800 veterinarians across Canada were sent a questionnaire in order to assess the status of heartworm disease in Canada in 1983 and 26% of them responded. Veterinarians reported that 59 504 dogs were blood-tested to check for microfilariae and 771 dogs (1.30% of those tested) were found with Dirofilaria immitis. Heartworm disease was diagnosed in all provinces except New Brunswick and Newfoundland but most (733) of the cases were in Ontario. Heartworm disease was found most frequently in companion dogs over three years of age maintained mainly outdoors in rural areas. About 31% of the cases were observed with clinical signs of heartworm disease and 64% had a history of not having left Canada. Southwestern Ontario continues to be the focus of the infection and most of the dogs there had not left the province previously. 相似文献
15.
In late December 1985, 1485 institutional veterinarians and small and mixed animal clinics across Canada were sent a questionnaire in order to assess the status of Dirofilaria immitis in Canada in 1985 and 44% of them responded. Veterinarians reported that 137,300 dogs were blood-tested to check for microfilariae and 1210 dogs were found with heartworm. Another 36 dogs were amicrofilaremic but diagnosed with heartworm disease to give the total number diagnosed in 1985 as 1247 (0.91%). Heartworm was reported from all provinces except Prince Edward Island, Newfoundland and Saskatchewan but most (1126) of the cases were in Ontario. Southwestern Ontario continued to be the primary focus of the infection in Canada. From Quebec, 91 cases were reported mostly from and around Montreal. From Manitoba, 19 cases were reported from Winnipeg and surrounding areas. Heartworm was found most frequently in companion dogs over three years of age maintained mainly outdoors in rural areas. About 28% of the cases were observed with clinical signs of heartworm disease and 78% had a history of not having left Canada. 相似文献
16.
In late November 1988, 1581 small and mixed animal clinics and institutional veterinarians across Canada were sent a questionnaire in order to assess the status of Dirofilaria immitis in Canada in 1988, and 46% of them responded. Veterinarians reported that 181,577 dogs were blood-tested for heartworm disease and 367 dogs were found with D. immitis microfilariae. Another 60 dogs were amicrofilaremic but diagnosed with heartworm disease to give the total number of cases diagnosed in 1988 as 441 (0.24%). 相似文献
17.
In late November 1989, 1732 clinics and institutional veterinarians were sent a questionnaire to assess the status of Dirofilaria immitis, and 51.7% responded. Of 247,716 dogs tested, 394 had D. immitis microfilariae and 51 were amicrofilaremic for a total of 445 cases and heartworm prevalence of 0.17%. Most (408) of these dogs had no preventive medication and the prevalence among dogs tested and unprotected was 1.01%. That prevalence was considerably higher in endemic areas. Thirty-seven dogs with heartworm had preventive medication. Heartworm was most frequent in companion dogs over three years of age maintained outdoors in rural areas. About 75% of the cases had never left Canada, 26% had clinical signs and 125 were not treated. Heartworm was reported from British Columbia, Manitoba, Ontario, Quebec, Nova Scotia and Newfoundland, but 383 cases were in Ontario. South-western Ontario was the primary focus of infection. There were 33 cases in Quebec and 24 in Manitoba, mainly found in and around Metropolitan Montreal and Winnipeg respectively. 相似文献
18.
In late November 1987, 1246 institutional veterinarians and small and mixed animal clinics across Canada were sent a questionnaire in order to assess the status of Dirofilaria immitis in Canada in 1987, and 50% of them responded. Veterinarians reported that 165,428 dogs were blood tested for heartworm disease and 511 dogs were found with D. immitis microfilariae. Another 78 dogs were amicrofilaremic but diagnosed with heartworm disease to give the total number of cases diagnosed in 1987 as 589 (0.35%). 相似文献
19.
In late December 1986, 1224 institutional veterinarians and small and mixed animal clinics across Canada were sent a questionnaire in order to assess the status of Dirofilaria immitis in Canada in 1986; 46% of them responded. Veterinarians reported that 150,989 dogs were blood-tested for microfilariae and 869 dogs were found with heartworm. Another 65 dogs were amicrofilaremic but diagnosed with heartworm disease and one was found with heartworm at necropsy to give the total number diagnosed in 1986 as 935 (0.62%). Heartworm was reported from Manitoba, New Brunswick, Ontario and Quebec, but most (810) of the cases were from Ontario. South-western Ontario continued to be the primary focus of the infection in Canada. There were 103 cases reported from Quebec, mostly from and around Montreal, and 21 cases from Manitoba, from Winnipeg and surrounding areas. Heartworm was found most frequently in companion dogs over three years of age maintained mainly outdoors in rural areas. About 33% of the cases were observed with clinical signs of heartworm disease and 81% had a history of not having left Canada. 相似文献
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