Airway hypersensitivity induced by Ascaris suum extract in New Zealand Romney sheep     

Chen W  Pack RJ  Alley MR  Carr DH  Manktelow BW 《New Zealand veterinary journal》1990,38(2):57-61

Sheep from local farms with and without previous exposure to pigs were tested for their skin and airway responses to a commercial Ascaris suum antigen. There was an immediate reaction to intradermal injection of the antigen in 90% of 101 sheep. A bronchial provocation test by aerosol of the same antigen was undertaken on 43 of the sheep with a positive skin reaction. About 70% of sheep showed an immediate airway response to the antigen as an aerosol, reflected as a significant increase in airway resistance and/or decrease of dynamic lung compliance. The mean peak airway resistance and mean lowest dynamic lung compliance were 165% above and 61% below their baselines, respectively. No significant changes were recorded when the same animals were given an aerosol of phosphate buffered saline. Similarly, no correlation was found between the degree of skin reaction and the magnitude of bronchoconstriction (p>0.05). The sheep with previous exposure to pigs showed no significant differences in airway responses to antigen challenge, although they showed significantly greater skin reactions than those without exposure to pigs. These results indicate that the majority of Romney sheep in the Manawatu have a natural skin and airway sensitivity to A. suum antigen and may therefore be used as an animal model to study human airway hypersensitivity. The origin of this sensitivity has yet to be determined.  相似文献   

Archeology of the arctic     

Fitzhugh W 《Science (New York, N.Y.)》1980,208(4445):732-733

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韩国一次性收获的红椒品种—Saeng-ryeog216     

M.C.Cho  D.H.pae  Y.S.Cho  Y.Chae  W.M.Lee  D.H.Kim 《辣椒杂志》2003,(4)

根据栽培面积以及为农民提供的收入而言,红辣椒在韩国一直是仅次于水稻而居第二位的重要农作物。按人均计算,韩国人均年辣椒粉的消费量达2.5kg以上,可能是世界最高记录。辣椒在韩国主要用作泡菜(韩国称之为Kimchi)香辛料和菜肴中的  相似文献   

拮抗细菌菌株Bacillus spp.间的相互作用及其对水稻纹枯病的抑制   总被引：5，自引：0，他引：5       下载免费PDF全文

李湘民  胡白石  许志刚  Mew T. W. 《植物保护学报》2003,30(3):273-278

测定了6个Bacillus spp.和1个Pseudomonas sp.P-13(G-对照菌株)在PPM培养基上的相互作用。在总共42个组合中，有27个组合是可亲和性的。在以B5423为单剂之一的5个组合中，亲和性的组合有4个。在温室条件下通过分批播种，在水稻分蘖盛期喷以B5423-R(B5423的标记菌株，是利福平抗性的突变体)为单剂之一的4个亲和性组合的菌悬浮液，以检测该组合中B5423-R在水稻茎基部的种群数量。结果发现，与单剂B5423-R相比，在应用1～7天内，组合B5423-R B45中，B5423-R的群体数量显著性降低；组合B5423-R B95、B5423-R B77中，B5423-R的群体数量与单剂无显著差异；组合B5423-R B4313中，B5423-R的群体数量在应用1～4天内与单剂无显著性差异，但在应用第7天显著地高于单剂。离体叶片纹枯病痛斑面积的抑制试验表明，与各自的单剂相比，组合B95 B5423及B95 Er77显著地抑制了纹枯病病斑面积；而组合B45 B80、B45 B5423和B45 B95纹枯病病斑面积显著地高于各自的单剂；其余10个组合与各自的单剂无显著差异。  相似文献   

Body weight growth Model of Datong Yak in Qinghai     

W.Minqiang　Zh.Huiling　L.Pingli　T.Yongqiang　L.Jiye　L.Zonglin 《中国草食动物》2005,(Z2):32-34

Summary:This study was conducted to develop a suitable model for describing the growth pattern of the yak. The data used consisted of body weight records of 76 growing yak aged between 5 to 37 months. Three mathematical models were applied to describe the growth curves during this development period:①Y1=20.105 + 11. 250x-0. 526x2 ;used for describing the growth curve of yak aged 5 to 13 months;②Y2 = -359.687 + 49. 977x - 1. 249x2 ;used for animals aged 13 to 25 months;and ③Y3 = -833. 339 + 63. 772x - 1. 019x2 ;used for animals aged 25 to 37 months.  相似文献   

Analysis of High Reproductivity on Wild Yak Bull     

陆仲璘  J.W.ZHANG 《中国草食动物》2005,(Z2):199-200

Sperm concentration of wild yak bull is 2. 13 billion per milliliter. Survival time at 0-4 ℃ is 57hrs. After thawing survival time at 37 ℃ is 12 hrs. Resistance coefficient is 144,000. Abnormal sperm rate and acrosomal integrated rate of post-thawing is 9.17% and 87.53% respectively. Moving viscosity is 1. 169 cp. Total nitrogen is 1 437.7 mg/100 ml. Head of sperm is significantly shorter and end piece is significantly longer than that of domestic yak and yellow cattle. Activity of hyaluronidase is highly stronger than the domestic yak,and the activity of LDH is higher than the domestic yak by 48 %. Hence,the fertility of the wild yak bull is powerful and the artificial inseminated rate with domestic yak and yellow cattle is 88.9% and 71.58% respectively.  相似文献   

大豆粕在鲑鳟鱼类饲料中的利用（续）     

Ronald W Hardy 《中国水产》2014,(11):81-82

五．鲑鳟饲料中目前的大豆产品用量 如前所讨论，大豆粕在鳟鱼饲料中的使用已有60年的历史，不过仅使用于鱼苗后的阶段，且用量很少。其它在鲑鳟饲料中曾被评估过的大豆产品包括大豆浓缩蛋白、大豆分离蛋白、全脂大豆与大豆油。溶剂萃脂之去皮大豆粕（48％粗蛋白）在鲑鳟饲料中使用较普遍。  相似文献   

平邑甜茶总 RNA 提取方法研究     

张丽杰 《分子植物育种》2014,(2):338-341

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What is your diagnosis? Gastroesophageal intussusception     

Roach W  Hecht S 《Journal of the American Veterinary Medical Association》2007,231(3):381-382

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Evaluation of the diagnosis of subclinical endometritis in dairy cattle using ultrasound     

Lenz M  Drillich M  Heuwieser W 《Berliner und Münchener tier?rztliche Wochenschrift》2007,120(5-6):237-244

The aim of this study was to determine signs of subclinical endometritis found by ultrasound that are associated with reduced fertility in dairy cows.The maximum diameter of the uterine lumen was determined by ultrasound in 324 cows without clinical signs of endometritis after evaluation of the genital tract 21 to 27 days postpartum. Cows were classified into healthy or with subclinical endometritis by three threshold values for the maximum uterine lumen diameter of 0.2 cm, 0.5 cm or 0.8 cm. Examinations by rectal palpation and ultrasound as well as classifications were repeated 14 days later. In addition, ovaries were scanned by ultrasound to determine the stage of the estrous cycle. In a subgroup of 103 cows the echotexture of the uterus and its contents was evaluated. In these cows the diagnosis of subclinical endometritis was performed by a scoring system. The diameter of the uterine lumen was significantly affected by stage of the estrous cycle at the time of examination. However, no effects were found for the stage of the cycle at the time of examination on subsequent reproductive performance. A uterine lumen with a maximum diameter of more than 0.2 cm showed a significant negative association with conception rate and proportion of cows pregnant. Classification based on higher threshold values did not reveal an association with reproductive performance. Echogenic content in the uterus also decreased reproductive performance. A classification based on the echotexture of the uterus and its contents revealed significant differences between healthy cows and cows with subclinical endometritis regarding the proportion of cows inseminated and pregnant.The results of this study showed that the diagnostic of bovine endometritis should be broadend by ultrasonography. The definition of subclinical endometritis diagnosed by means of ultrasonography has to be evaluated in further studies.  相似文献