Detection of a broad range of potato viruses in a single assay by mechanical inoculation of herbaceous test plants   总被引：1，自引：0，他引：1  

J. T. J. Verhoeven  J. W. Roenhorst 《EPPO Bulletin》2003,33(2):305-311

To optimize mechanical inoculation of test plants as part of the regulated post-entry quarantine testing of stolon- and tuber-forming Solanum spp. (including potato), nine test plant species have been screened for their ability to detect 22 potato-infecting viruses. These included all the common mechanically transmissible potato viruses and most of the viruses found in potato incidentally. The symptoms observed after mechanical inoculation are shown for each combination of test plant species and virus. Under given conditions, Nicotiana occidentalis -P1 and Nicotiana hesperis -67A were found to detect reliably 20 and 18 out of 22 viruses respectively. These and former results on the seed-transmissible viruses and Andean potato mottle virus demonstrate that these Nicotiana species are very suitable for post-entry quarantine testing. Addition of either Chenopodium amaranticolor or Chenopodium quinoa to these two species may slightly extend the range of viruses. Therefore, using C. amaranticolor / C. quinoa , N. hesperis -67A and N. occidentalis -P1 for the biological screening of imported Solanum spp. will improve both the efficiency and the quality of post-entry quarantine testing.  相似文献   

雏鸭铜中毒的实验观察   总被引：14，自引：4，他引：10  

崔恒敏  陈怀涛 《中国家禽》2003,25(11):8-10

1日龄天府肉鸭健雏210只随机分为三组,分别喂给铜12.16mg/kg(对照或1组)、850mg/kg(2组)和1050mg/kg(3组)日粮7周。结果表明,后两组雏鸭分别于3周龄和2周龄开始出现临床症状,生长发育迟缓,并出现死亡;血红蛋白含量和红细胞数量显著低于对照组(p<0.05),红细胞变形、变性,大小不等;血清铜含量和肝铜含量极显著高于对照组(p<0.01)。  相似文献   

棉籽粕营养成分最新调查     

宋建国  Park W.Waldroup  Jarrod H.Kersey 《国外畜牧学(猪与禽)》2003,23(3):6-8

本介绍了对棉籽粕养分含量的最新调查结果，数据包括了平均值和变异范围。本应该对考虑在日粮中应用棉籽粕的营养师具有价值。  相似文献   

合作猪胴体品质、肉质特性及随体重变化规律的研究     

陈国顺 《猪业科学》2003,20(8):46-48

本研究测定了24头合作猪的胴体品质和肉质特性,以分析合作猪胴体、肌肉品质随体重(30kg,35kg,40kg,45kg)的变化规律,确定其最佳屠宰体重。研究结果认为,合作猪瘦肉率在48.8%～55.0%之间,肌肉pH1值在6.35～6.50之间,肉色指标优良,大理石纹评分均在3.75～4.05之间,肌内脂肪含量在3.60%～3.85%之间;当40kg体重时屠宰的失水率和滴水损失均最低,分别为10.68%和1.84%,且剪切力值最低,为3.08kg。相同性状间的有较高的正相关,肌肉pH1值几乎与各项肉质指标呈负相关。通过灰色关联度综合评定结果认为,合作猪是在活重达到40kg时屠宰,其肉质最优。  相似文献   

水泥混凝土路面施工要点分析   总被引：3，自引：2，他引：1  

易文  陈冬梅 《森林工程》2003,19(6):45-46

路面施工的好坏关系到整条道路的使用质量 ,本文通过介绍水泥混凝土施工路面施工的要求 ,为相关单位提供参考  相似文献   

Relationships between performance traits and the expression of growth hormone, insulin-like growth factor-I, and insulin in pigs selected for growth or leanness     

M. F. W. Te  Pas  C. L. M. Gerritsen  A. H. Visscher  K. H. de  Greef 《Zeitschrift für Tierzüchtung und Züchtungsbiologie》2003,120(5):346-357

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THE FOURTH INTERNATIONAL CONGRESS OF ENTOMOLOGY     

Herrick GW 《Science (New York, N.Y.)》1928,68(1759):237-244

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A SECOND CAPTURE OF THE WHALE SHARK,RHINEODON TYPUS,IN FLORIDA WATERS     

Gudger EW 《Science (New York, N.Y.)》1913,38(973):270-271

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THE OCCURRENCE OF ANOPHELES DARLINGI ROOT IN BRITISH HONDURAS AND GUATEMALA     

Komp WH 《Science (New York, N.Y.)》1940,91(2370):522-523

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Illusive memory     

T WB 《Science (New York, N.Y.)》1884,3(59):345

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