做好猪群饲养管理的三项措施

本文介绍规模化猪场猪群的三方面的饲养管理措施。第一部分介绍猪群的饲喂管理,重点介绍猪饲料品质和饲喂方法;第二部分介绍猪舍管理,重点介绍猪舍面积、公母猪比例的配置、猪舍地面要求等;第三部分介绍猪舍的卫生管理;良好的猪舍卫生可使猪群患病风险大大减少,尤其是可以减少母猪乳房炎的发生。     

新蜂王的介绍

介绍新蜂王时,有的蜂王很容易介绍,有的很难介绍,三番五次介绍都往往受围。遇到这种情况,怎么办呢?我们利用给蜂王身上抹蜜,喷冷水的办法介绍,效果很好。新蜂王被介绍进蜂群后由于它与本箱蜜蜂气味不同,加之对新环境的不习惯,在箱内到处爬动造成少数蜜蜂跟随追赶,后来越来越多,便造成蜂王受围。遇到这种情     

新母鸡的自选饲喂（一）

本文共分两部分,文中介绍了日粮(尤其介绍了如何操纵鸡自选养分的能力)、温度和间歇光照在性成熟和提早产蛋方面的相互作用。本期介绍第一部分,下期介绍第二部分。     

如何提高冷冲压模具使用寿命

首先介绍了冷冲模具概述,然后介绍了影响冲压冷模具的寿命因素分析,最后介绍了提高冷冲压模具使用寿命的措施与途径。     

介绍蜂王直插法好

介绍蜂王直插法好山东省金乡县马庙乡红庙村（２７２２０２）张崇哲众所周知，介绍新产卵的蜂王难度较大，在流蜜期介绍蜂王困难要少一些，成功率高些，否则介绍蜂王就难了。如用铁丝王笼介绍一只新产卵的蜂王，有时将蜂王关两天，然后放王，蜂王被围，再关两三天放王，蜂...     

基于PCI9054的主动DMA传输的设计与实现

本文给出了一种基于PCI9054的主动DMA传输的FPGA设计思想。文中首先对PCI9054及其工作模式进行了介绍,重点介绍了DMA传输方式,而后介绍了主动DMA传输的思想,并对FPGA设计中的要点进行了简要的介绍。     

《饲料天地》专栏征稿函

《饲料天地》专栏是本刊新增设的一个栏目,主要为中小饲料企业服务,兼顾规模养殖场户,主要子栏目有:饲料添加剂——介绍国内外饲料添加剂的研究进展与应用技术;资源开发——介绍饲料原料及其开发应用新技术;加工与设备——介绍饲料及饲料添加剂的加工配制技术及相关机械设备的应用;分析与展望——介绍饲料行业市场运行变化及发展趋势;实验室检测——介绍饲料安全生产、质量标准控制的相关技术;服务营销——介绍饲料企业进行市场营销、服务客户的经验、策略、案例及相关知识;行业动态——介绍饲料行业政策动向及相关事件。稿件要求:篇幅一般…     

中意蜂合并饲养完全可能

我在数十年的养蜂实践中,探索发明了蜂王介绍器。介绍蜂王(特别是中蜂王)不带脾,不带蜂,不分时间、气候,且具有百分之百的成功率。1蜂王介绍器的制做用2块塑料薄板(像单节王笼样式的),三方钻孔,孔距为2mm,使工蜂不能出入,但能饲喂王浆;用竹签连接,并使一方像王笼似的能够拉开或关闭的活动门,关上时工蜂可进出,蜂王不能进出;如用王笼改造,三方加密竹签,既方便,又简单。2介绍方法把要介绍的蜂王(最好剪翅)捉来关进蜂王介绍器;按介绍距离的远近,确定随王进入介绍器工蜂的多少——远多近少,以保证蜂王情绪的稳定,并用与介绍器活动门相同大小的新…     

越冬群失王不能直接介绍

正我养中西蜂50多年,发现直接介绍蜂王失王时间不能超过10天。越冬时蜂群失王在10天以内可直接介绍蜂王。冬季因天气冷,飞出寻王的工蜂较少,蜂群急需蜂王,直接介绍容易成功。如果超过10天,工蜂恐惧情绪慢慢消退,此时直接介绍蜂王,群内工蜂感到多了蜂王,工蜂会一拥而上,不到10分钟,就会将蜂王围杀致死。若是第二次第三次直接介绍蜂王,恶性循环,一定会将介绍的蜂王再次围杀。     

羊瘤胃鼓气病因分析及诊治要点

结合日常工作经验,自原发性和继发性病例阐述诱病因。介绍典型症状的基础上,介绍诊断要点。在此基础上,文章介绍诊疗建议,以供参考和借鉴。     

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 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 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 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 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%).     

Meiosis in bovine oocytes matured in vitro and in vivo

Meiosis in bovine oocytes has; been studied after maturation in vitro or in vivo. Oocytes for in vitro maturation were collected from the ovaries of slaughtered cattle without regard to the phase of the estrous cycle while in vivo maturation was studied in oocytes from gonadotrophin-stimulated heifers at times varying between 6 and 36 h after the beginning of behavioural estrus. Oocytes from slaughtered cattle were classified according to their cumulus complex and ooplasm and were cultured for 6, 12, 18, 24, 36 or 48 h in modified Krebs-Ringer bicarbonate buffer before fixation) for cytogenetic analysis. Oocytes from stimulated heifers were aspirated from follicles or flushed from the oviducts, classified according to cumulus and ooplasm, and fixed within 6 h of collection. Nuclear maturation was more rapid in vitro than in vivo. The largest proportion of oocytes reached maturity (Mil) after 12 to 18 h in culture or 30 to 36 h after the onset of behavioural estrus. Oocytes devoid of cumulus cells or showing signs of vacuolation or degeneration had virtually no capacity for nuclear maturation.     

Malaria in cynomolgus monkeys used in toxicity studies in Japan

Plasmodium spp. protozoa cause malaria and are known to infect humans and a variety of animal species including macaque monkeys. Here we report both our experience with malaria recrudescence in cynomolgus monkeys (Macaca fascicularis) in a toxicity study and the results of a survey on Plasmodium infection in cynomolgus monkeys imported to Japan for laboratory use. A cynomolgus monkey from the toxicity study presented with severe anemia and Plasmodium protozoa in erythrocytes on a thin blood smear and was subsequently diagnosed with symptomatic malaria. In this animal, congestion and accumulation of hemozoin (malaria pigment) in macrophages were noted in the enlarged and darkly discolored spleen. As a follow-up for the experience, spleen sections from 800 cynomolgus monkeys in toxicity studies conducted between 2003 and 2013 were retrospectively examined for hemozoin deposition as a marker of Plasmodium infection. The origin of the animals included Cambodia, China, Indonesia, and Vietnam. Hemozoin deposition was confirmed in 44% of all examined monkeys. Monkeys from Indonesia showed the highest incidence of hemozoin deposition (approx. 80%). A high prevalence of Plasmodium infection in laboratory monkeys was also confirmed with polymerase chain reaction (PCR) by using Plasmodium genus-specific primers. Although Japan is not a country with endemic malaria, it is important to be aware of the prevalence and potential impact of background infection with Plasmodium spp. and recrudescence of symptomatic malaria in imported laboratory monkeys on pharmaceutical toxicity studies.     

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%).     

肠道葡萄糖转运载体研究进展

D-葡萄糖是机体的主要能源物质,对机体代谢与内环境稳态有非常重要的作用。葡萄糖的吸收主要通过位于肠黏膜上皮细胞的两类葡萄糖转运载体家族来完成。Na+与SGLTs的结合促使载体与葡萄糖的结合,葡萄糖顺着Na+的浓度梯度进入细胞;当细胞内葡萄糖浓度升高后,葡萄糖顺着浓度差通过肠黏膜上皮细胞基底膜GLUT2经易化扩散转运进入血液。本文综述了肠道不同葡萄糖转运载体家族的成员和分类,介绍了其结构特征、功能特性及其组织分布;并详细阐述了肠道葡萄糖转运载体基因表达的影响因素。