Foot rot in cattle; a small controlled experiment     

ROBERTS SJ  KIESEL GK  LEWIS NF 《The Cornell veterinarian》1948,38(2):122-130

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肉鸡的接雏与雏鸡的管理     

李云龙 《山东家禽》2014,(1):33-35

雏鸡的质量和管理的好坏，在某种程度上决定着育雏的质量，并直接影响肉鸡养殖的成功率。  相似文献   

模拟叶部斑病的发生对玉米脱水速率的影响     

邵勇  魏国才  孙艳杰  石运强  刘英蕊  邵珊珊  李云龙  刘宇强  南元涛 《农业科技通讯》2021,(9):76-79

为研究玉米灌浆期、乳熟初期、乳熟末期、蜡熟期4个时期叶部病害发病对脱水速率的影响,以及在同一时期不同级别病害对玉米脱水速率的影响,以绥玉29为试验材料进行了田间模拟玉米叶部病害的发生试验,在不同熟期依据病害发生级别标准对叶片进行人工处理。结果表明,玉米叶斑病不同的发生时期、不同级别的病害对玉米脱水速率的影响各不相同,在玉米灌浆期、乳熟初期随着病害级别的增加,脱水速率呈现不同程度的下降,但在这2个时期各级别病害发生后脱水速率下降水平并不显著;在乳熟后期、蜡熟期随着病害级别的增加,脱水速率呈现不同程度的上升,而且各级别呈现显著或者极显著的差异,说明在玉米干物质积累完成后,随着病害发生级别的增加,对玉米脱水有促进作用。  相似文献   

新型蝇蛆蛋白饲料替代鱼粉对泥鳅生长性能和非特异性免疫力的影响     

张海涛  李云龙  陈永亮  顾开朗  高峰 《中国饲料》2021,(2):74-77

在基础饲料中以新型蝇蛆蛋白饲料替代基础饲料中20%、40%、60%、80%、100%的鱼粉,制成6种等氮等能的饲料(分别记为Ⅰ、Ⅱ、Ⅲ、Ⅳ、Ⅴ组,Ⅵ为对照组),饲养泥鳅50 d,通过比较各饲料组泥鳅的生长性能和抗氧化指标,研究新型蝇蛆蛋白饲料替代鱼粉对泥鳅生长性能和非特异性免疫力的影响。试验结果表明,随着饲料中新型蝇蛆蛋白饲料比例的增加,泥鳅增重率(WGR)和特定生长率(SGR)呈先上升后逐渐平稳的趋势,其中Ⅲ组达到最大值,并显著高于Ⅵ组(P<0.05)。新型蝇蛆蛋白饲料替代不同比例鱼粉对泥鳅肌肉的常规成分并无显著影响(P>0.05)。Ⅱ和Ⅲ组血清和肝胰脏超氧化物歧化酶(SOD)和过氧化氢酶(CAT)活性显著高于对照组(P<0.05),血清溶菌酶(LZM)活性显著高于对照组(P<0.05)。Ⅱ和Ⅲ组血清和肝胰脏丙二醛(MDA)含量显著低于对照组(P<0.05)。综上所述,在本试验条件下,泥鳅配合饲料中新型蝇蛆蛋白饲料替代鱼粉的比例为60%时能提高泥鳅的生长性能和非特异性免疫功能。  相似文献   

规模化牛场犊牛腹泻大肠杆菌对常用消毒剂的敏感性研究     

米兴亮  李云龙  王晓兰  周霞 《安徽农业科学》2012,40(22):11317-11319

[目的]测定犊牛腹泻大肠杆菌对常用消毒剂的敏感性,为牛场消毒剂的合理使用提供理论依据。[方法]选用常用的拜洁、安灭杀、三氯异氰尿酸3种消毒剂,对来自石河子地区不同牛场犊牛腹泻大肠杆菌分离株进行了最小抑菌浓度、最小杀菌浓度以及定量杀菌率的测定。[结果]安灭杀、三氯异氰尿酸和拜洁的最佳抑菌浓度分别为1∶240、1∶1 200和1∶1 200。5 min内不同浓度的3种消毒剂对10株大肠杆菌菌株的最小杀菌浓度分别为1∶80、1∶600、1∶800。在推荐浓度下,对石河子地区犊牛腹泻大肠杆菌,三氯异氰尿酸(1∶1 000～1 600)杀菌率为99.86%～99.88%,安灭杀(1∶160～240)杀菌率为99.12%～99.24%,拜洁(1∶1 000～1 600)杀菌率为97.64%～98.36%。[结论]犊牛腹泻大肠杆菌对三氯异氰尿酸最为敏感,而安灭杀和苯扎氯铵次之。  相似文献   

济南微型盆景的培养造型及其管理     

梁玉庆  李云龙 《花木盆景》2000,(12):21-21

深受人们喜爱的微型盆景与其他盆景一样是一种有生命的、综合性很强的集树桩盆景、山水盆景及赏石等于一体的艺术品。微型盆景又称掌上盆景。它麻雀虽小，但五脏俱全。济南地区微型盆景以微型树桩盆景为主，独具个性，这是因为它运用了一种较理想的技法，所培养出的微型树桩盆景与常规的树桩盆景一样，形态自然清新，造型丰富多彩。  相似文献   

徐州地区育肥羊饲料配制与日常管理     

高峰  张海涛  李云龙 《山东畜牧兽医》2015,36(6)

<正>徐州地区自古就有食用羊肉的习俗,随着近些年人们生活水平的提高和政府的倡导,徐州地区设立伏羊节(伏羊节是于每年入伏之季,即初伏之日开始,持续一个月)。所以,徐州地区对羊肉的需要量非常大,肉羊的饲养企业很多。最近,应企业要求,笔者就育肥羊养殖做了一些调查,形成此文,供大家参考。1徐州地区气候及饲养现状徐州位于东经116°22′-118°40′、北纬33°43′-34°58′之间。东西长约210km,南北宽约140km,总面积11258km2。  相似文献   

Responses of cattle to two dosages of Brucella abortus strain RB51: serology, clearance and efficacy     

Olsen SC  Bricker B  Palmer MV  Jensen AE  Cheville NF 《Research in veterinary science》1999,66(2):101-105

A new brucellosis vaccine, Brucella abortus strain RB51 (SRB51), is currently recommended for use as a calfhood vaccine in the US at dosages between 1 x 10(10)and 3.4 x 10(10)colony-forming units (CFU). The purpose of the study reported here was to compare responses to minimal and maximal recommended SRB51 dosages. Eighteen heifer calves were vaccinated subcutaneously with 1.6 x 10(10)CFU of SRB51, 3.2 x 10(10)CFU of SRB51, or saline (n = 6 per treatment). The vaccine strain was recovered from the superficial cervical lymph node 14 weeks after vaccination in two of six animals that received 1.6 x 10(10)CFU SRB51, but not from any cattle vaccinated with 3.2 x 10(10)CFU SRB51. The higher SRB51 dosage stimulated greater antibody titres. Protection against abortion or infection following B. abortus strain 2308 (S2308) challenge was similar for both SRB51 dosages and greater than resistance of non-vaccinates. The vaccine strain was recovered from one heifer and her fetus at necropsy 1 week prior to estimated parturition. Data from this study suggests that SRB51 induces similar protective immunity across the recommended dosage range. The SRB51 vaccine may persist in some cattle into adulthood but the incidence and significance of this persistence remains unknown.  相似文献   

Pathological and microbiological studies on pneumonic lungs from Danish calves     

Tegtmeier C  Uttenthal A  Friis NF  Jensen NE  Jensen HE 《Zentralblatt für Veterin?rmedizin. Reihe B. Journal of veterinary medicine. Series B》1999,46(10):693-700

During 1 year, the association between microbiological and pathological findings in 72 lungs from calves submitted to the Danish Veterinary Laboratory for diagnostic purposes was studied. All cases were evaluated pathologically and bacteriologically, whereas only 68 cases were examined for the presence of bovine respiratory syncytial virus (BRSV), parainfluenza-3 virus (PI-3 virus) and bovine coronavirus, 62 cases for bovine viral diarrhoea virus (BVD), 45 cases for bovine adenovirus and 51 cases for mycoplasmas. Based on histopathological examination, the cases were diagnosed as fibrinous and/or necrotizing bronchopneumonia, suppurative bronchopneumonia, embolic pneumonia and others. The diagnoses were based on the dominating and most severe lesions in each lung. Haemophilus somnus, Pasteurella multocida, Actinomyces pyogenes, P. haemolytica and BRSV were the most commonly found bacterial and viral lung pathogens, respectively. Pasteurella spp. and H. somnus were often associated with the more severe fibrinonecrotizing type of bronchopneumonia, whereas BRSV was primarily detected in cases of suppurative bronchopneumonia. Mycoplasma bovis was isolated from one case only, whereas M. dispar, M. bovirhinis and Ureaplasma diversum were present, often concomitantly, in the majority of cases. Aspergillus fumigatus was isolated from one case.  相似文献   

Investigation of antigen-specific T-cell responses and subcutaneous granuloma development during experimental sensitization of calves with Mycobacterium avium subsp paratuberculosis     

Simutis FJ  Cheville NF  Jones DE 《American journal of veterinary research》2005,66(3):474-482

OBJECTIVE: To characterize the early cellular immune response to Mycobacterium avium subsp paratuberculosis (MAP) infection and evaluate the development of granulomatous inflammation at the SC injection site in experimentally inoculated calves. ANIMALS: Forty-eight 4-week-old calves. PROCEDURE: Calves received an SC injection of MAP strain 19698 (n = 25), sterile saline (0.9% NaCl) solution (20), or a commercial paratuberculosis vaccine (3); the inoculation site tissue and associated draining lymph node were excised at postinoculation day (PID) 0 (n = 36), 7 (14), 14 (6), 21 (8), and 60 (32). Sections of inoculation site tissues were evaluated immunohistochemically for T-cell subsets; lymph node mononuclear cells (LNMCs) were assessed for T-cell surface markers and for intracellular interferon-gamma via flow cytometry. RESULTS: At MAP inoculation sites, calves developed mild, focal granulomatous inflammation by PID 7; by PID 60, areas of inflammation contained macrophages with numerous lymphocytes. Compared with control calves, there was increased antigen-specific LNMC proliferation in MAP- and vaccine-inoculated calves at PID 60, although proliferation among lymphocyte subsets was not significantly different between MAP-inoculated and control calves; in vaccine-inoculated calves, CD4+ T-cells predominated. In MAP-inoculated and control calves, antigen-specific interferon-gamma production by LNMCs did not differ significantly; vaccine-inoculated calves had marked interferon-gamma expression by CD4+ T-cells. CONCLUSIONS AND CLINICAL RELEVANCE: In calves, SC administration of MAP resulted in granulomatous inflammation at inoculation sites and an antigen-specific T-cell proliferative response. Results suggest that this experimental system can be used to reproducibly generate antigen-specific T-cells during MAP infection for functional analysis.  相似文献