饲料用木聚糖酶活力测定的研究

<正>饲料用木聚糖酶的分析测定是长期以来困扰木聚糖酶生产和应用的一个主要难题,特别是固态发酵生产的木聚糖酶,发酵成品中往往含有其它非淀粉多糖酶(纤维素酶、葡聚糖酶、果胶酶和甘露聚糖酶等)[1-3]。文献报道的关于影响酶活测定的因素很多,测定的重复     

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<正>饲料用非淀粉多糖酶研究获突破日前,中国农科院饲料研究所圆满完成了新型饲料用非淀粉多糖酶制剂产品的创制项目。专家称,该项目成果在开辟新的饲料资源、提高现有饲料资源利用率、解决饲料相关产业环境污染等方面,取得了良好的社会和生态效益。科研人员从酶的分子生物学基础研究入手,解决了木聚糖酶等多种非淀粉多糖水解酶的基因资源高效获取酶的性能、酶的应用性能和高效率生产问题,实现了多种非淀粉多糖酶的     

我国在饲料用非淀粉多糖酶研究上取得突破

<正>中国农业科学院饲料研究所姚斌研究团队通过近10年地潜心研究,圆满完成了"新型饲料用非淀粉多糖酶制剂产品的创制"项目。科研人员从酶的分子生物学基础研究入手,解决了木聚糖酶等多种非淀粉多糖水解酶的基因资源高效获取酶的性能、酶的应用性能和高效率生产问题,实现了多种非淀粉多糖酶的廉价生产,其表达水平较初始研究时分别提高了25~     

姚斌团队实现饲料用酶低价生产

正近日,中国农业科学院饲料研究所姚斌团队通过近10年潜心研究,完成了"新型饲料用非淀粉多糖酶制剂产品的创制"项目。该成果从酶的分子生物学基础研究入手,解决了木聚糖酶等多种非淀粉多糖水解酶的基因资源高效利用问题,从而实现了多种非淀粉多糖酶的低价生产。该研究成果获得了2014年北京市科学技术奖一等奖。非淀粉多糖是一类抗营养因子,在饲料中     

从检测数据分析饲料原料的质量情况(2)

<正>3饲料用大豆粕检测数据的统计分析饲料用大豆粕作为植物蛋白质源在牲畜饲料中广为使用,饲料用大豆粕按照GB/T19541-2004《饲料用大豆粕》的规定,检测项目不多,只     

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鱼粉（饲料用）生产许可证获证企业名单公布日前，农业部公布了鱼粉（饲料用）生产许可证获证企业名单，并向各地发出通知。通知说：根据鱼粉（饲料用）生产许可证管理的有关规定，各有关省（自治区、直辖市）渔业主管部门会同当地工业产品生产许可证办公室等部门，对提出申请鱼粉（饲料用）生产许可证换证、补证的企业进行了质量体系审查和产品实物抽样检验。经农业部工业产品许可证办公室审核，有大连金州环盛鱼粉厂等４９家企业获得鱼粉（饲料用）生产许可证（名单见附件）。该批证书自公布之日起，五年有效。附件：鱼粉（饲料用）生产许…     

木聚糖酶的研究进展

木聚糖酶是一种重要的工业酶制剂，现已从多种生物体中分离到大量的不同类型和功能的木聚糖酶。本文就木聚糖酶的理化性质、木聚糖酶的分类、木聚糖酶酶活测定方法、木聚糖酶的基因工程及应用等方面的研究现状和进展进行了综述。     

饲料用玉米品质及其对产蛋鸡的影响

文章通过对饲料用玉米品质的论述,对玉米品质标准以及判别方法等进行了分析,对如何选择饲料用玉米提供一些参考。     

不同来源的木聚糖酶及其组合酶对产蛋鸡营养物质表观消化率影响的研究

<正>1试验材料与方法1.1试验材料组合木聚糖酶、真菌酸性木聚糖酶、真菌中性木聚糖酶、细菌中性木聚糖酶,3个不同添加水平的真菌中性木聚糖酶,产品酶活性均为12000IU/g,组合木聚糖酶为3种木聚糖酶,活性各4000IU/g,由湖南尤特尔生化有限公司生产。1.2试验动物及饲养管理     

饲料用混合油脂在储存过程中氧化情况的研究

研究旨在观察饲料用混合油脂在储存过程中各氧化指标的变化规律,以得到评价饲料用混合油脂氧化程度的有效衡量指标。试验选用3批次豆油,3批次鱼油,10批次国产饲料用混合油脂以及2批次美国饲料级混合油,在室温下储存120 d,观察酸价、过氧化值、丙二醛值、茴香胺值和水提取物电导率5个指标的变化情况。结果表明,除酸价外其余四个指标都随着油脂储藏时间的延长呈不同程度的上升趋势,其中过氧化值和茴香胺值在饲料用混合油脂储藏过程中变化程度最为明显,试验结果表明,过氧化值和茴香胺值可以用作评价饲料用混合油脂氧化程度的敏感指标。     

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 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 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 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.

     

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.