13～18周龄笼养蛋鸭适宜蛋白质和蛋氨酸水平的研究

用 32 4羽满 1 2周龄的金定鸭 ,通过饲养试验、代谢试验、屠宰试验和对试鸭产蛋期 (1 9～ 2 8周龄 )产蛋性能的观察 ,研究了在等能条件下(ME :1 1 51MJ/kg) ,不同蛋白质水平 (CP :1 3 %、 1 5 %、 1 7% )和蛋氨酸水平 (Met/CP :0 0 1 7、 0 0 2 2、 0 0 2 7)组成的 9种饲粮对 1 3～ 1 8周龄笼养蛋鸭的生长性能、养分利用、体成分沉积和产蛋期产蛋性能的影响。结果表明 :该阶段饲粮粗蛋白、蛋氨酸水平对体增重影响不显著 (P >0 0 5) ;体增重与蛋氨酸 (% )呈一定的正相关 (r=0 4574) ;CP为 1 3%、Met/CP为 0 0 2 7组采食量一直较稳定、较高 ,且饲料效率又好。代谢试验 :不同粗蛋白、蛋氨酸水平饲粮对试鸭氮存留率和能量的利用率影响显著(P <0 0 5或P<0 0 1 ) ,且它们随饲粮CP水平的升高而降低 ,随蛋氨酸水平升高而升高 ;磷的利用率也分别以CP为 1 3%的水平和Met/CP为 0 0 2 7的水平极显著地高于其他水平对磷利用率 (P <0 0 1 )。屠宰试验 :当Met/CP为 0 0 2 7时 ,体氮沉积量和体磷沉积量最佳。产蛋性能 :开产日龄和高峰日龄与 1 3～ 1 8周龄CP食入量呈弱的负相关 (r=- 0 1 83 3和r=- 0 0 984) ,与蛋氨酸食入量呈正相关 (r =0 5780和r =0 435 0 )。饲粮粗蛋白、蛋氨酸水平对 1 9～ 2 8周龄     

山羊子宫内肽能神经分布及妊娠时的变化

采用免疫组化方法，研究了山羊子宫内含P物质（SP）和含血管活性肠肽（VIP）神经的分布。结果，妊娠及未妊娠山羊子宫颈内有粗细不等的神经束行经于外膜和肌层中，神经分支形成丛状分布于血管壁，子宫颈部未见SP神经元胞体及VIP神经元胞体；未妊娠山羊子宫角内SP神经和VIP神经均呈丛状围绕血管并分布于血管壁；妊娠中期的孕角和非孕角均有胎盘形成，除胎盘内无神经分布外，SP神经及VIP神经同样分支形成丛状分布于血管壁。结果提示，山羊子宫内SP神经和VIP神经主要支配子宫内血管，妊娠时除胎盘内无神经分布外，SP神经及VIP神经的分布无明显变化。     

汇率对跨国经营企业价值影响的实证分析

根据跨国经营企业价值／汇率弹性模型，得出了企业价值与汇率的函数关系；进一步，利用某些企业的实际数据，确定了这些企业价值与汇率关系式的系数，并预测了某企业未来价值的变化趋势。实证分析结果表明，跨国经营企业价值与汇率的相关性最高，其回归所得的函数具有较好的短期（一个季度内）预测效果，可以用于预测短期内跨国经营企业价值的变动。     

NM－1号抗旱剂的研究

试验结果表明谷子在—１３．９Ｐａ的负压下发芽率只有２４．０％，在—１６．７３Ｐａ时发芽率为１６．３％。用０．５％的ＮＭ—１号抗旱剂包衣后，在—１６．７３Ｐａ的负压下发芽率可达６５．６％，比对照提高４９．３％。同０．５％的ＮＭ—１抗旱剂在大豆现蕾期喷施叶面１次，相对收获株率为１１５．３８％，相对千粒量为１０７．７％，增产率为４０，２７％。玉米在６叶期喷施０．５％的抗旱剂后，饱和亏减少４．０９ｇ，是对照的４３．８１％；干物质积累比对照快６７．１９％，蒸腾系数减少８．３６ｇ。     

近冰点温度贮藏草莓的研究

草莓呼吸旺盛,果皮薄易受伤,难以贮藏。利用近冰点温度贮藏可以明显地抑制草莓的呼吸作用,结合小袋包装的气密性,改善了包装内部的气体组成,提高草莓果实周围的相对湿度并减少空气对流,从而抑制了草莓在贮藏过程中糖分、水分的损耗,减少了糖酸比值的下降。保持了一定的感观指标,可使草莓的贮藏时间延长。     

放牧率和放牧时期对绵羊排粪量、采食量和干物质消化率关系的影响

实验研究表明，绵羊在同一放牧时期，随着放牧率的增大，鲜粪量有所减少，粪中干物质含量有所增大，但只有处理1．33羊／hm2·138天与6．67羊／hm2·138天问存在显著性差异。在同一放牧率条件下，不同放牧时期相比，以8月份粪中干物质含量最低；在各种处理之间，放牧绵羊全天干粪量均无显著性的差异。在同一放牧时期，随着放牧率的增大日采食量显著减少，而同一放牧率不同放牧时期的日采食量保持相对稳定。粪便的干重与干物质采食量的关系很小，与干物质消化率呈负相关。放牧绵羊白天排粪量为晚上的2倍，但粪中干物质含量几乎没有差异，同时，不同放牧率和不同放牧时期对粪便的颜色和形状等均有较明显的影响。     

引起笼养蛋鸡疲劳症的主要因素研究

本试验以营养因子、产蛋率、钙源、笼养生态等角度对笼养蛋鸡疲劳症进行综合研究,寻找引起笼养蛋鸡疲劳症的主要因素及减少笼养蛋鸡疲劳症的途径。     

Attempts at Preventing Further Spread of Bovine Virus Diarrhoea Virus (BVDV) Infection in 5 Danish Dairy Herds in which BVDV had been Isolated

In 5 herds in which bovine virus diarrhoea virus (BVDV) had been isolated, all animals were bled for virological and serological examination. After the herd blood test, follow up blood tests were made on calves born up to 6 months later in 1 herd, 9 months later in 1 herd and up to 12 months later in 3 herds. Persistently infected animals (PI animals) were removed and after a time period a small herd sample of 10 animals that were born after removal of the PI animals were examined for BVDV antibodies.At the herd blood test a total of 21 PI animals were detected. During the follow up period another 25 PI animals were born.Among animals in the small herd samples collected after removal of the PI animals, antibody positive animals were found in the 2 herds with the shortest follow up period. In the 3 herds with a 1 year follow up period there were no antibody carriers in the herd sample.It seems possible to prevent further spread of infection with BVDV if all animals in the herds as well as animals born during the following year are examined and PI animals removed.     

Insemination with Stallion Semen Frozen in 0,5 ml Straws

Contents: An insemination trial using frozen semen is described. The freezing procedure was slightly modified from the Hannover method. The insemination dose consisted of 7 medium straws containing approx 1 10⁹ spermatozoa. A total of 28 mares of the Norwegian Trotter breed were inseminated during the 1991 season. During oestrus the mares were examined at 12 hour intervals, and the insemination was carried out after detection of ovulation. The pregnancy rate was 43% after the first insemination, increased to 68% after second and further to 75% after the third and last insemination. The foaling rate was 61.5%.     

四种杀菌剂对小麦根病病原菌的室内药效试验

室内药效试验表明：麦根宁1号、敌力脱对小麦根腐病菌的生长均有良好的抑制作用。麦根宁Ⅰ号稀释300倍时，平均抑菌圈直径最大；敌力脱稀释800倍时，平均抑菌圈直径最大。同时，麦根宁Ⅰ号、敌力脱Ⅱ号，粉锈宁对小麦全蚀病菌生长也有明显的抑制作用。粉锈宁，麦根宁Ⅰ，Ⅱ号在稀释10000倍时，抑菌率均达100％；敌力脱在稀释15000倍时，平均抑菌率仍达89．7％。