共查询到20条相似文献，搜索用时 171 毫秒
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以现代信息技术为文献信息保障系统提供技术支持为背景，论述了新疆畜牧兽医文献信息保障的现状及存在的问题、必要性、制约因素等方面，探讨建设新疆畜牧兽医文献保障体系的对策。 相似文献
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通过对专业检索工具中文献量的统计分析，反映了畜牧学各领域的研究进展。报道了核心作者及核心文献的分析分布情况，推荐了一批核心期刊，对科研人员了解学科动态，利用文献及高速研究方向提供了依据。 相似文献
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中刊库检索及畜牧兽医文献计量分析 总被引：1，自引：0，他引：1
本文讨论了《中文科技期刊数据库》(光盘版)的检索方法、检索功能，对库中畜牧兽医文献进行了计量统计分析，为学科科技工作者检索、利用文献提供了参考依据。文中还对优化数据库系统提出了四点建议。 相似文献
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数字图书馆建设已经逐渐认识到灰色文献的信息价值，一些图书馆利用宽带网络资源积极建设灰色数字文献资源。针对数字图书馆目前在开发和利用灰色数字文献方面的问题，以重庆大学数字图书馆实践为例，分析构建灰色文献数据库的基础平台、建设内容及保障措施等，力求使灰色文献的信息价值得到充分开发和利用。 相似文献
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为了解国内小反刍兽疫领域的最新研究热点和发展趋势，借助“中国知网”数据库，基于CiteSpace可视化软件，对2000—2021年发表的小反刍兽疫相关研究文献的作者、来源期刊、研究内容及关注热点等，从发文量、文献被引频次、文献总下载量等方面，分析来源期刊及高被引文献，构建研究者合作关系，重点分析国内不同时间段的关键词共现网络图谱和时间线图谱。结果显示：该领域的年度发文量呈阶段性增长态势，且国内已形成相对稳定的科研团体；《中国动物检疫》期刊的均篇被引频次、被引总频次和篇均下载量均位于首位，尤其是2007年王志亮团队发表的研究论文备受关注；诊断、防控、治疗、临床症状、流行病学、免疫、疫苗等关键词出现频次较高，从38次到117次不等，各关键词间连接线多而紧密，但以诊断、防控、治疗出现频次最高；2000—2006年文献数量少，研究内容分散，关键词出现频率低，相互联系较少；2007—2012年文献数量开始增多，但热度不高，范围较单一；2013—2021年文献数量持续增高，研究范围拓宽，以基因表达、免疫检测、治疗诊断等为主。结果表明：国内PPR研究网络虽然形成稍晚，但近期发展快速，研究团体趋于稳定，研究范围更为广泛，其中基因表达、免疫检测、治疗诊断成为最新研究热点。本研究为全面了解国内小反刍兽疫研究状况，研判前沿热点，促进研究合作提供了参考。 相似文献
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壳聚糖铁对仔猪生长性能及免疫功能的影响 总被引：2，自引：0，他引：2
选24头体重相近、日龄相同的健康仔猪随机分为6组:1组为对照组,饲喂基础日粮;2组为壳聚糖组,在基础日粮中添加壳聚糖300 mg/kg;3组为硫酸亚铁组,以硫酸亚铁的形式在基础日粮中添加铁100 mg/kg;4~6组为壳聚糖铁组,以壳聚糖铁的形式分别在基础日粮中添加铁70 mg/kg、100 mg/kg和130 mg/kg,研究壳聚糖铁对仔猪生产性能及免疫功能的影响。结果显示:3~6组仔猪平均日增重显著高于第1组、第2组(P<0.05);第6组仔猪料重比显著低于第1组(P<0.05)。试验至15 d,第5、第6组仔猪外周淋巴细胞转化率显著高于第1~4组(P<0.05或P<0.01);第4组、第5组仔猪血清球蛋白含量显著高于第1组和第3组(P<0.05)。试验至30 d,第6组仔猪外周淋巴细胞转化率显著高于第1、第2组(P<0.05或P<0.01);第3~5组显著高于第1组(P<0.05)。试验至45 d和60 d,第5组、第6组仔猪外周淋巴细胞转化率显著高于第1~3组(P<0.05)。试验至45 d,第5组和第6组仔猪血清球蛋白含量显著高于第1组和第2组(P<0.05)。试验至60 d,第4~6组仔猪血清球蛋白含量显著高于第1组和第3组(P<0.05)。试验表明,壳聚糖铁能显著提高仔猪的生产性能,与硫酸亚铁基本一致;壳聚糖铁能增强仔猪免疫功能,效果要显著优于硫酸亚铁。 相似文献
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浙江省蚕区桑树“凋萎”症状病因诊断 总被引：1，自引：1，他引：0
从浙江省临安、桐庐等地桑园中的"凋萎"桑树根、茎部获得151个细菌分离物样品。经离体水培接种试验表明,这些分离物均可引起桑树"凋萎"症状,其形态、大小、染色反应、培养性状与对照番茄青枯菌(Ralstonia so-lanacearum)相近;PCR鉴定其中125个分离物为雷尔氏菌(Ralstonia solanacearum)。结合田间发生症状,将桑树"凋萎"症状诊断为细菌性青枯病。从125个雷尔氏菌株中选择16个典型菌株进行研究,根据生理小种划分标准,这些菌株均为雷尔氏菌的生理小种1,其中75%为青枯菌的生化型Ⅴ、25%为青枯菌的生化型Ⅲ。 相似文献
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Three goats were dosed orally with a 0.2 % aqueous copper sulphate solution. The dosing was 20 mg copper sulphate/kg body weight twice a day for 56 to 113 days. One of the goats accumulated substantial amounts of copper in the liver and developed two haemolytic crises. The two other goats showed only increased liver copper concentrations before they were killed. The results indicate that the goats were susceptible in varying degrees to repeated oral copper dosing, and that two of the goats were significantly less susceptible to copper than sheep. The goat that turned into a haemolytic crisis showed changes similar to those seen in sheep as far as blood and plasma parameters are concerned. The gross and histological lesions were also mainly of the same type as described in sheep. The hepatic lesions found in the goat differed to some degree from those found in sheep as the necroses were more distinctly located to the centrilobular area, and as the iron pigments were mainly located in phagocytes in the hepatic sinusóides. 相似文献
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不同杂交组合周岁羔羊肉用性能分析 总被引：2，自引：0，他引：2
为了探讨高原放牧条件下不同杂交后代的肉用品质,以白萨福克、特克塞尔、邦德、澳洲美利奴为父本,以甘肃高山细毛羊为母本杂交生产羔羊肉(分别设为Ⅰ、Ⅱ、Ⅲ和Ⅳ组)。选择4个杂交组合周岁羔羊各5只,开展屠宰测定和肉质分析。结果表明,引入品种可以明显提高甘肃高山细毛羊的产肉力,4个组合中萨×甘组、澳×甘组改良效果最为显著,白萨甘细的肌肉分级标准判定其为TM级,脂肪含量略高,澳甘细和特甘细均为PME级,邦甘细为PL级。 相似文献
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Responses of swine to oral inoculation with embryonated eggs of Ascaris suum were monitored, using lymphocyte blastogenesis assays, indirect radioimmunoassays, and peripheral eosinophil counts (EC). Transient cell-mediated immune responses of peripheral lymphocytes were detected by lymphocyte blastogenesis assay as early as postinoculation day (PID) 2, but were rarely positive for consecutive samples taken at 2-day intervals. Humoral antibodies were first detected at PID 6 to 17 by indirect radioimmunoassays in the various experiments. Positive cutaneous delayed hypersensitivity reactions were observed when pigs were tested at 6 to 7 weeks after inoculation. Histopathologic examination verified infiltration of lymphocytes into the lesions. The EC increased as early as PID 4 to 7 and showed a secondary increase after the 2nd oral inoculation of eggs to as high as 11,400/mm3 (44% of the total WBC). Subsequently, EC decreased rapidly 14 days after the last inoculation of eggs. 相似文献
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苜蓿萌发期耐盐性综合评价与耐盐种质筛选 总被引：2，自引：0，他引：2
为探明苜蓿（Medicago L.）萌发期耐盐性评价方法并筛选耐盐种质,采用加权隶属函数法对120个苜蓿种质进行综合评价并划分为不同的耐盐级别。试验以150 mmol·L-1 NaCl溶液进行盐胁迫,以发芽势等13个性状来鉴定苜蓿对盐胁迫的反应,以耐盐系数为评价依据。结果表明：150 mmol·L-1的盐溶液对苜蓿种子萌发和幼苗生长均有一定的抑制作用,发芽势、发芽率、萌发指数比幼苗生长受抑制的程度更大;盐胁迫对根的抑制程度大于苗。相关分析表明,加权隶属函数法可以综合评价苜蓿萌发期耐盐性。根据加权隶属函数值和聚类分析,可将120个种质分为耐盐性不同的5个级别：11个种质高耐盐（1级）、24个种质耐盐（2级）、38个种质中等（3级）、36个种质敏盐（4级）、11个种质高敏盐（5级）。 相似文献
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Alkaline phosphatase activity as well as lipid, polysaccharide, glycogen, and acid mucopolysaccharide levels in the uteri of 79 gilts were histochemically tested during the first three sexual cycles. Intra-cyclic alkaline phosphatase activity exhibited clearly pronounced variations in the surface epithelium, with maximum values reached in metoestrus, and moderate variations in the endometrial stroma, with maximum values reached in dioestrus. Cycle-dependent variations were recordable also from the glycogen and lipid levels in the surface and glandular epithelia and from the acid mucopolysaccharide levels in the endometrial stroma. The activity of alkaline phosphatase as well as the levels of glycogen and acid mucopolysaccharides during the first cycle still were lower than those in the second and third. Biochemical examinations of the endometrium revealed significant cycle-dependent variations in the activities of alkaline phosphatase, inorganic pyrophosphatase, and succinate-dehydrogenase as well as in the concentrations of soluble protein and glycogen, with maximum values being recordable on the tenth day of cycle. No significant intracyclic variations were recordable from the activities of acid phosphatase as well as of aspartate alanine-amino transferase. 相似文献
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The present study was aimed at elucidating the histogenesis of parotid gland of buffalo. The study was carried out on buffalo foetuses (n = 36), during different stages of prenatal life. The foetuses were categorised into three groups based on their curved crown rump length (CVRL). The primordial anlage of parotid salivary gland was evident at 40th day of development whereas the primary ducts, in the form of cords, were first observed at 81st day of prenatal life. The capsule formation as well as the lobulation of the gland was initiated at 127th day. At 141st day, the duct system of gland was completed. The terminal tubules attained the structure of acini at 167th day. The myoepithelial cells first appeared as flattened basal cells initially around the developing acinar cells at 167th day. The typical compound tubulo-acinar nature of the gland was first observed at 185th day. Purely serous acinar cells were seen from 185th day onwards. The micrometrical studies revealed that the mean diameter of acinar cells, intercalated ducts, striated ducts and large ducts increased with the advancement of age. The serous acinar cells were devoid of acidic as well as neutral mucopolysaccharides in prenatal age groups; however, large ducts with goblet cells exhibited positive reaction. Combined PAS-AB method revealed mixed reaction in acinar cells as well as in large ducts. Fine lipid droplets were observed in intralobular as well as interlobular connective tissue; however, phospholipids were observed in the cell membrane of secretory cells and ducts. 相似文献