辽宁省主要耕地土壤速效钾含量及其区域分布状况

为了对辽宁省耕地土壤钾素水平进行正确的评价 ,于 1 993～ 1 997年在全省 1 3个市的 32个县(市、区 )采集了有代表性的主要耕地土壤样本846份。利用ＡＳＩ法分析了土壤速效钾含量 ,并绘制出辽宁省土壤速效钾含量分布图。这是我省第 2次土壤普查以来 ,辽宁省农业科学院土肥所第 1次进行土壤速效钾分析化验工作 ,将为辽宁省钾肥的合理施用提供科学依据。1　土样的采集根据全省第 2次土壤普查各地区不同土壤类型 ,按每 3333ｈｍ2 取一个土壤样本 ,不足 3333ｈｍ2 的土类不取样的原则 ,共采集了 846份抽查土样。旱田取 0～ 2 0ｃｍ、水田取 0～…     

Use of Glutamine and Low Density Lipoproteins Isolated from Egg Yolk to Improve Buck Semen Freezing

To improve the results obtained with a reference cryopreservation extender (control extender: Triladyl® + 20% (v/v) egg yolk + 6.4% (v/v) glycerol) for freezing caprine semen, glutamine was added to 18 split ejaculates at concentrations of 0, 20, 40, 80 and 120 m m (experiment 1). In experiment 2, glutamine was added to 18 split ejaculates at concentrations of 20, 25, 30, 35 and 40 m m . In the third experiment, the egg yolk was replaced with the low-density lipoprotein (LDL) fraction of egg yolk. The quality of frozen then thawed spermatozoa in each extender was compared using computer-assisted semen analysis. In experiment 1, glutamine at concentrations of 20 m m and 40 m m significantly improved sperm motility compared with the control extender. However, at 120 m m , a significant decrease in motility and velocity was observed. In experiment 2, motility, curvilinear velocity and amplitude of lateral head displacement (ALH) were improved in glutamine at 25 m m compared with the control. In experiment 3, 8% LDL and 25 m m glutamine significantly improved sperm motility, straight line velocity and ALH. In the fourth experiment, the quality of the previously defined freezing extender (Triladyl® + 8% (v/v) LDL + 25 m m glutamine + 6.4% (v/v) glycerol) was tested by comparing acrosome, tail membrane, plasma membrane and DNA integrity in 18 split ejaculates of frozen then thawed spermatozoa with spermatozoa that had been frozen then thawed in the control extender, and with spermatozoa from fresh, unfrozen sperm. The percentage of spermatozoa with intact acrosomes and tail membranes was significantly higher with the newly defined extender than that observed with the control extender. There was no significant difference in the percentage of spermatozoa with intact DNA between the frozen and fresh semen.     

Veterinary pathology in Europe in the light of the congresses of the European Society of Veterinary Pathology in the last decade

This paper presents the main trends in the activity of European veterinary pathologists in the context of their oral presentations (plenary lectures and short presentations) and posters provided during annual meetings of the European Society of Veterinary Pathology (ESVP), in the decade 1997-2006. It was found that the issue that was most often brought up in the meetings was organ pathology (566 presentations). Infectious and parasitical diseases were only slightly less frequent (548 presentations). Oncology was another common issue (404 presentations). During this decade, 52 plenary lectures were presented, 765 oral presentations and 1 072 posters. Altogether, 1 889 presentations were made, which is between 127 and 238 per year. Research by Polish scientists accounted for 3.16% of all presentations. Additionally, the subject matter discussed at the annual meetings is analysed, and the trends in the development of veterinary diagnostic pathology and broad pathology education are indicated. It is shown that veterinary pathology enhances knowledge in the field of veterinary medicine by fulfilling a cognitive and diagnostic role.