甜菜碱代替部分蛋氨酸对肉仔鸡生产性能和胴体品质影响的研究

甜菜碱代替部分蛋氨酸对肉仔鸡生产性能和胴体品质影响的研究ＥＦＦＥＣＴＯＦＳＵＢＳＴＩＴＵＴＩＯＮＯＦＢＥＴＡＩＮＧＦＯＲＳＯＭＥＰＡＲＴＯＦＭＥＴＨＩＯＮＩＮＧＯＮＰＥＲＦＯＲＭＡＮＣＥＡＮＤＣＡＲＣＡＳＳＱＵＡＬＩＴＹＯＦＢＲＯＩＬＥＲＳＤｅｎｇＹ...     

饲料企业库存控制方法的综合研究

文中首先分析了库存控制对饲料企业库存系统的重要性,同时,针对饲料企业的库存控制特点,论述了经济订货批量模型、定期订货法、ABC分类法、动态规划模型等方法在饲料企业库存管理中的应用。指出当经济条件发生变化时,库存控制方法也应及时改变,合理选用各种控制方法,以减少库存物资占用资金,提高企业的经济效益。     

传染性支气管炎病毒类M_(41)地方分离株S_1基因克隆及高变区序列分析

传染性支气管炎病毒（ＩＢＶ）分离株ＱＤ经ＲＴ－ＰＣＲ扩增出约１．７ｋｂＳ１糖蛋白基因ｃＤＮＡ，修饰后插入ｐＵＣ１８ＳｍａｌⅠ／ＥｃｏＲＩ位点构成质粒ｐＵＣＱＤＳ１。对克隆的Ｓ１基因５′端高变区序列测定显示，起始密码上游６０碱基和下游３８０碱基中与参考株Ｍ４１Ｓ１基因序列仅有１个碱基的差异，表明ＱＤ为一类Ｍ４１分离株。     

鸡眼区相关淋巴组织对ND疫苗点眼免疫频答：Ⅱ.眼区局部T淋巴细？…

本研究采用流式细胞仪技术对鸡眼区相关淋巴组织在鸡新城疫疫苗点眼免疫后的局部Ｔ淋巴细胞亚群的变化进行了研究，研究发现，ＬａＳｏｔａ等疫苗点眼免疫后眼区相关淋巴组织对ＮＤ疫苗可产生良好的细胞免疫应答。免疫组结膜相关淋巴组织和哈氏腺中ＣＤ＾４＋和和ＣＮＨＮＸＬＥＱＯＶＪＧＧＦ ＵＴＨ ＱＫＱ ＲＧ ＮＦＧＫＴＡＫ ＹＭ 。ＱＫＵＭＡＤＷＥＵＪ ＃粒模? ＤＪ ＷＶ ＸＸ ＷＹＮＫＪＧ ＪＥＪＯＹＭ ＧＦ     

Dot—ELISA检测牛副结核病抗体的研究

本文利用提纯的副结核分枝杆菌胞浆特异性抗原，建立了检测牛副结核抗体的Ｄｏｔ－ＥＬＩＳＡ方法，用该方法对粪便培养阳性性的３２头份牛副结核病血清检测，检出２７头，阳性检出率为８４．４％，其敏感性与ＥＬＩＳＡ相似，与１０头ＯＴ变态反应阳性牛血清检测，无交叉反应。Ｍ－ｐｈｌｅｉＭ．ｆｏｒｔｕｉｔｕｍ．Ｍ．ｋａｎｓａｓｉｉ人工高兔血清经两次用Ｍ．ｐｈｌｅｉ悬液吸收，用建立的Ｄｏｔ－ＥＬＩＳＡ方法也无交叉反应     

硒,维生素E对鸡体脂质过氧化的影响

２１日龄健康肉鸡８０只,随机分为４组（每组２０只）,分别在基础饲料中添加维生素Ｅ（ＶＥ）＋硒（Ｓｅ）、ＶＥ、Ｓｅ和不添加任何物质。ＶＥ添加量为１００ｍｇ／ｋｇ,Ｓｅ添加量为０．５ｍｇ／ｋｇ。试验期为５周。试验结束,立即采取血液、肝脏、胸肌、腿肌样品,分别于２ｈ内和冷藏（２℃）４８ｈ后检测其谷胱甘肽过氧化物酶（ＧＳＨ－Ｐｘ）和超氧化物歧化酶（ＳＯＤ）的活性以及丙二醛（ＭＤＡ）含量。结果表明,添加ＶＥ和／或Ｓｅ的３个试验组肉鸡的ＧＳＨ－Ｐｘ、ＳＯＤ活性均显著高于对照组,ＭＤＡ含量显著低于对照组,提示饲料中添加ＶＥ和／或Ｓｅ,均可增强鸡体的抗氧化效果。ＶＥ和Ｓｅ联用显示明显的协同效应。     

传染性支气近炎病毒类M41地方分离株S1基因克隆及高变区序列分析

传染性支的管炎病毒（ＩＢＶ）分离株ＱＤ经ＲＴ－ＰＣＲ扩增出约１．７ｋｂＳ１糖蛋白基因ｃＤＮＡ，修饰后插入ｐＵＣ１８ＳｍａｌⅠ／ＥｃｏＲＩ位点构成质粒ｐＵＣＱＤＳ１。对克隆的Ｓ１基因５′端高变区序列测定显示，起始密码上游６０碱基和下游３８０碱基中与参考株Ｍ４１Ｓ１基因序列仅有１个碱基的差异，表明ＱＤ为一类Ｍ４１分离株。     

禽源大肠杆菌O2,O78分离株外膜蛋白型的研究

从１７个禽大肠杆菌病病例的Ｏ２、Ｏ７８分离株提取的主要外膜蛋白（ＯＭＦ），在ＳＤＳ－ｐＡＧＥ中出现了２个ＯＭＰ型。其中，９个Ｏ２分离株属２个ＯＭＰ型，８个Ｏ７８分离株均属其中的１个ＯＭＰ型。结果表明，分离到的Ｏ２、Ｏ７８大肠杆菌具有多样性的ＯＭＰ型，而且两者存在着共同的ＯＭＰ型。     

Ab─ELISA和Ag─ELISA诊断骆驼伊氏锥虫感染的比较

采用四种方法：即①单克隆抗体检测抗原的酶联免疫吸附试验（Ａｇ－ＥＬＩＳＡ）②检测抗体的酶联免疫吸附试验（Ａｂ－ＥＵＳＡ）③表膜检查（ＢＣＥ）④小白鼠接种（ＭＩ），检查了肯尼亚１８３头骆驼锥虫的循环抗原，ＢＣＥ查出３７头阳性２０％），ＭＩ６０头阳性（３３％），Ａｇ－ＥＬＩＳＡ６３头阳性（３４％），Ａｂ－ＥＬＩＳＡ检出９０头阳性（４９％）。其中ＢＣＥ未能检出的２４头中，Ａｇ－ＥＬＩＳＡ检出１８头（７５％）。所有阳性头数中，Ａｇ－ＥＬＩＳＡ检出９３％，Ａｂ－ＥＬＩＳＡ９５％。根据５５头的结果，阳性与阴性之间Ａｇ－ＥＬＩＳＡＯＤ值差异极显著（Ｐ＜０．０００１），Ａｂ－ＥＬＩＳＡＯＤ值差异不显著。因此，用Ａｇ－ＥＬＩＳＡ或结合ＢＣＥ诊断伊氏锥虫感染比用ＡＢ－ＥＬＩＳＡ更理想。     

海泡石在饲料工业中的开发与应用

目前，海泡石粉在饲料工业中普遍用作饲料添加剂、载体或稀释剂、颗粒饲料的粘合剂。海泡石是一种纤维状天然粘土矿物，灰白色，有滑感、无毒、无臭，具有特殊的层链状晶体结构和热稳定性、抗盐性、脱色吸附性强，有除毒去臭去污能力，有很好的阳离子交换和流变性能，比表面很高。它的化学分子式通常为：４ＭｇＯ·６ＳｉＱ２·２ＳＨ２Ｏ或Ｈ１Ｍｇ２Ｓｉ３Ｏ１Ｏ、Ｍｇ２Ｈ２（ＳｉＯ３）３Ｈ２Ｏ。经测试，海泡石的化学成份及各种矿物质、微量元素含量为：ＳｉＯ２２９．６７－７０．３；Ａ１２Ｏ３１．８２－９．１７；ＣａＯｌ．０３－…     

Heartworm in dogs in Canada in 1984

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.

     

Heartworm in dogs in Canada in 1983

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.

     

Heartworm in dogs in Canada in 1991

In late November 1991, 1883 clinics in Canada were sent a questionnaire to assess the status of Dirofilaria immitis in dogs in 1991 and there was a 60.0% response. There were 344,031 dogs tested for heart-worm (HW), 627 were found infected and the prevalence of HW infection was 0.18%. There were 417 dogs with HW in Ontario, 116 in Manitoba, 38 in Quebec, 53 in British Columbia, three in Alberta, and one in Nova Scotia. In British Columbia, all of the infected dogs but one were from the Okanagan valley which, as from 1991, is a new focus of infection in Canada. Most dogs with HW had not been on preventive medication in 1990, and the prevalence among dogs tested and unprotected was 0.59%. That prevalence was considerably higher in endemic areas. Companion dogs, over three years of age and maintained primarily outdoors in rural areas, were most frequently infected. One cat was diagnosed with D. immitis and 33 dogs had Dipetalonema reconditium.     

Heartworm in dogs in Canada in 1985

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.

     

Heartworm in dogs in Canada in 1988

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%).     

Heartworm in dogs in Canada in 1989

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.

     

Heartworm in dogs in Canada in 1987

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%).     

Heartworm in dogs in Canada in 1986

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.