农牧交错区5种禾本科牧草与草原二号苜蓿混播试验研究

研究5种禾本科牧草与草原二号苜蓿在不同混播方式下种群的生长高度、种间竞争率（CRi）及产草量。结果表明：草原二号苜蓿的生长不受单播、混播的影响,混播促进了禾本科植物的生长。随着豆科播种量的增加,各试验小区的产量增加。人工草地较天然草地有明显的增产作用。混播人工草地比单播人工草地又有显著的增产效应,其中2/3草原二号苜蓿＋1/3披碱草的混播组合比其他组合增产现象明显。综合结果表明,草原二号苜蓿和缘毛雀麦的混播组合具有合理的禾/豆比例和较高的生产力水平,为较合理的物种组合。     

半胱亚磺酸脱羧酶和牛磺酸转运体mRNA在成年小鼠睾丸间质细胞的表达

为检测成年小鼠睾丸间质细胞是否存在牛磺酸生物合成关键酶半胱亚磺酸脱羧酶(CSD)和牛磺酸转运体(TauT)mRNA的表达,通过Percoll分离液分离纯化成年小鼠睾丸间质细胞,运用RT-PCR方法测定睾丸间质细胞中CSD和TauT mRNA表达情况。结果显示,成年小鼠睾丸间质细胞存在CSD和TauT mRNA表达。说明成年小鼠睾丸间质细胞能通过CSD途径合成牛磺酸以及睾丸间质细胞可能存在牛磺酸的转运活动。     

凤尾桑及其芽变品系间遗传变异的ISSR分析

利用ISSR引物,从分子水平分析了凤尾桑及其芽变株系的遗传变异。从8个ISSR引物扩增结果来看,3个引物的扩增产物在株系间无差异,从变异株系扩增条带来看,凤尾芽变变异最大。本结果从分子水平证明了芽变株系的遗传结构差异。     

可发酵碳水化合物减少猪场臭气的机理和应用

可发酵碳水化合物,添加在猪日粮中到达后肠作为微生物发酵的底物,通过改变猪肠道和粪便中的微生物及其发酵过程,改变粪尿的理化特性,来减少氨的挥发以及臭气的产生。本文对臭气和除臭方法进行了简单的介绍,并综述了通过在猪日粮中添加可发酵碳水化合物来控制猪场臭气的机理和应用效果。     

蛋鸡J亚群禽白血病病毒3′非编码区序列特征分析

蛋用型鸡虽在试验条件下可以感染ALV-J,但自然感染时很少引起发病.然而,近年来在中国蛋鸡群中ALV-J发病严重,本研究对2008年以来ALV-J蛋鸡分离株的3′非编码区(3′UTR)进行了系统的分析.结果表明,89.5％(17/19)的ALV-J蛋鸡分离株的3′UTR出现了205 bp的缺失,94.7％(16/17)ALV-J蛋鸡分离株保留了完整的E元件.84.2％(16/19)的ALV-J蛋鸡分离株的U3区序列与肉鸡分离株的相似性低于92.5％,所有转录调控元件高度保守.ALV-J蛋鸡分离株的E元件和U3区均出现了多个碱基的突变.这些结果表明,ALV-J蛋鸡分离株的E元件和U3区正在迅速的演化,明显不同于肉鸡分离株的序列特征.这些发现有助于更好地了解ALV-J引起蛋鸡群发病的致病机理.     

甘肃省家畜棘球蚴病流行情况与防控对策

棘球蚴病又称包虫病,是一种重要的人兽共患寄生虫病,不仅给养殖业造成巨大的经济损失,而且对人体健康带来严重危害。本文论述了棘球蚴病在甘肃省的流行情况,指出了目前棘球蚴病防控工作存在的问题,结合甘肃省实际提出了棘球蚴病防控对策。     

Foot use and hand preference during feeding in captive black‐and‐white snub‐nosed monkeys (Rhinopithecus bieti)

Postural origin theory predicts that body postures are related to hand preference in nonhuman primates due to hemispheric specialization. Foot preference, especially in manipulating objects, is also a good predictor of hemispheric specialization in humans. We studied limb (hand and foot) preferences in 11 captive adult black‐and‐white snub‐nosed monkeys (Rhinopithecus bieti) to see how limb preference is influenced by postures and foot manipulation. Hand preference was significantly different for this group between quadrupedal standing and clinging postures, and sitting and clinging postures, but not between bipedal standing and clinging postures. Individuals were significantly more likely to use the right hand in the clinging posture than in quadrupedal standing or sitting postures. In the sitting posture, individuals maintained their respective hand preference even when the food was on the other side of the body. There was a gender difference in the sitting posture, where females preferred their right hand but males preferred their left. Individuals who did not routinely use their feet to manipulate objects, compared to those who did, shifted to greater right hand use from the clinging posture to the bipedal posture. One male individual and his offspring were more likely to use their feet to manipulate objects than the rest of the monkeys. In the present study, we reveal the first evidence of a postural effect on hand preference in R. bieti as well as a foot preference in this species. Our results mostly agree with the postural origin theory and hemispheric specialization.     

北方蚕业科研协作区第六批桑品种鉴定(陕西点)试验报告

2015—2016年对北方蚕业科研协作区4家单位的9个桑树新品种进行了共同鉴定。本批参鉴品种中,生长势旺、产叶量高、叶质好的品种有鲁插2号、鄂桑2号、陕桑9312、陕桑8826,其中鲁插2号叶片大而厚、发条力强,鄂桑2号节间密、片叶率高。