用逆转录病毒法制作鸡输卵管生物反应器的研究

本文综述了鸡的生物反应器和逆转录病毒法的研究，目前逆转录病毒法是制作鸡生物反应器的最合适的方法。     

参加央视《中国工作犬大集合》节目后两警犬再立新功

参加完中央电视台《中国工作犬大集合》节目后的工作犬,他们回到各自的岗位上,有什么突出表现呢?     

Studies on vitamin E and selenium deficiency in young pigs. III. Effect on kinetics of erythrocyte production and destruction.

The effect of vitamin E and/or selenium deficiency on the kinetics of erythrocyte production and destruction has been investigated in swine. The plasma iron turnover rate, 59Fe incorporation into newly formed red cells as well as the 51Cr apparent red cell half-life, were not found to be significantly affected by either vitamin E deficiency, selenium deficiency or deficiency of both, as compared to replete animals. The results of this study suggest that vitamin E is not a limiting factor for normal erythropoiesis in young growing pigs. Erythropoiesis appeared, however, to be slightly decreased in selenium deficient pigs and will need to be further investigated.     

黑色素皮质素受体1(MC1 R)基因与哺乳动物毛色

哺乳动物的有色毛表型要受黑色素皮质素受体1(Melanocortin Receptor1,MC 1 R)位点的不同等位基因调节。MC1R基因的变异与动物的皮毛、人的皮肤和头发颜色差异密切相关。本文对该基因的定位、突变、多态检测及黑色素皮质素受体的作用机制进行了综述。     

Some helminth and arthropod parasites of the grey duiker, Sylvicapra grimmia

Sixteen grey duikers were culled on the farm Riekert 's Laager in the central Transvaal at irregular intervals from May 1979-March 1981. One trematode species, 3 cestode species and 16 nematode species were recovered from these animals. Of these the following are new helminth records for this antelope: Cooperia hungi , Cooperia neitzi , Cooperia pectinata , Trichostrongylus axei, Trichostrongylus colubriformis, Trichostrongylus falculatus , Trichostrongylus instabilis , Impalaia tuberculata , Nematodirus sp. and Paramphistomum sp. In addition, 6 species of ixodid ticks were collected. These, in order of abundance, were Amblyomma hebraeum (55,9%), Rhipicephalus appendiculatus (36,6%), Rhipicephalus evertsi evertsi (5,1%), Boophilus decoloratus (2,3%), Boophilus microplus (0,05%) and Haemaphysalis sp. (0,05%). Only 60 (2,8%) of the 2 118 ticks that were collected were adults. Of the 3 species of lice that were recovered, Linognathus zumpti zumpti was most abundant (58,9%), but, out of a total of 1 498 collected, 1 496 occurred on 1 animal only. Linognathus breviceps constituted 29,5% and Damalinia lerouxi 11,6% of the total. A total of 277 specimens of the hippoboscid fly Lipoptena paradoxa were collected from 12 of the 16 animals examined. Trends in the seasonal fluctuation of Haemonchus, Trichostrongylus, Impalaia , Lipoptena and the immature stages of Amblyomma and R. appendiculatus are graphically illustrated.     

关中西部农业产业化的现状与对策

大力推进农业结构不断优化升级,实现产业化经营,是提高中国农业的整体素质、综合效益和国际竞争力的有效途径。在分析关中西部资源、产业现状、制约因素的同时,提出了促进关中西部农业产业化发展的对策和建议。     

家兔发情状态与受胎率和产仔数关系的研究

本文研究了家兔的发情状态与配种后的受胎率，以及产仔数之间的关系。以家兔阴粘膜颜色作为表观指标，将家兔的发情分为５个状态，其相应的阴粘膜颜色分别为：苍白、粉色、红色、大红、黑紫。经促排２号诱发排卵后，人工授精，相应状态下的受胎率为：２９．５％、４２．９％、５６．８％、５３．８％、２５．０％；相应状态下的平均产仔数分别为：５．５４、６．６９、６．６２、７．２１、５．５２。用促排３号处理后，相应状态下的受胎率为：９．０％、４３．２％、５３．２％、７０．０％、２１．７％。结果表明：无论是用促排２号，还是用促排３号处理，当阴粘膜颜色为苍白和黑紫时的受胎率或产仔数，都显著地低于或少于阴粘膜颜色为粉色、红色、大红时的受胎率（Ｐ＜０．０１）或产仔数（Ｐ＜０．０５）。说明，家兔的发情状态与配种后的受胎率和产仔数有密切的相关     

小尾寒羊多胎性能候选基因的研究进展

小尾寒羊具有常年发情、性成熟早和多胎性能的高繁殖力特性,平均每胎产羔2.6只,是我国优良的地方绵羊品种,也是我国独特的遗传资源。目前在BooroolaMerino羊、Inverdale羊和Hanna羊中已找到影响多胎性能的主基因,但国内对小尾寒羊多胎性能遗传机制的研究主要集中在常规的选育和分子标记方面,也有一些以候选基因法从分子水平上对小尾寒羊多胎机制进行研究,仍没有确立控制小尾寒羊高繁特性的主效基因,本文就其研究现状进行综述,为小尾寒羊主效基因的研究提供有益的参考。