平凉红牛与传统文化研究

本文以中华传统文化的视觉和祖国兽医学的理论与方法对"平凉红牛"本质内涵进行了挖掘与梳理,并深度解读"平凉红牛"的天地禀赋特质及与文化自信的内在联系,为破解"平凉红牛"的保护与开发利用及可持续发展提供必要的依据。     

垄作与垄向区田技术对黑土区坡耕地土壤侵蚀影响的研究进展

东北黑土区在中国粮食安全与可持续发展中占据重要地位,但过度开发利用导致该区土壤侵蚀问题严峻。耕作方式的差异直接影响黑土区坡耕地土壤侵蚀特征,相关研究的开展对于准确评价水土保持措施的适宜性具有重要意义。该研究通过系统梳理文献资料,总结了垄向、垄规格以及垄向区田技术的内涵及应用条件,分别综述了其对黑土区坡耕地土壤侵蚀的影响;指出了目前研究中还存在垄作与垄向区田技术对坡耕地土壤侵蚀影响的机理研究不深、垄向与垄规格之间的耦合关系分析不细、垄向区田垄沟土埂优化设计不足、土壤侵蚀综合影响因素探索不全等方面主要问题;明确了未来研究中应加强量化垄向、垄规格、垄向区田技术与其他水土保持措施相结合对黑土区坡耕地土壤侵蚀影响的过程与机理,为筛选适宜的水土保持耕作措施提供科学依据。     

基于时变窗口的油菜精量排种器漏播实时检测方法

为了快速准确地反映不同漏播状态类型,针对油菜精量排种器漏播实时检测问题,在界定了"稀疏缺苗"和"断条"2种不同漏播类型的基础上定义了稀疏缺苗系数与断条系数,分析了两系数的二维平面分布,提出了一种采用排种盘转速与排种脉冲同步检测、排种频率与时间间隔双重阈值约束的检测方法。该检测方法利用MSP430单片机的时间捕捉中断资源,在由排种盘转速脉冲序列信号确定的时间窗口内,通过光纤传感器感应获得排种序列的排种频率与排种时间间隔2类统计指标,依据设定的漏播严重程度评判系数,建立了漏播状态评判规则。在气力式油菜精量排种器上试验结果表明:该检测方法能够根据排种盘转速的变化自行调整检测时间窗口,对"稀疏缺苗"和"断条"漏播状态判断准确率可达100%,对于油菜精量联合直播机在田间不同作业速度下,该方法能够有效实现精量排种器漏播的实时检测,在考虑地轮滑移情况下检测结果滞后距离低于(84*型孔数)mm。该方法不仅有效解决了小粒径精量排种器重播条件下漏播的检测,而且对播量不足进行了约束,提高了漏播检测的实时性,为后期实现精准自动补种创造了有利条件。     

关于农科院校大学生自信心培养的探讨

本文就当前农科院校大学生自信心缺乏这一现象进行分析，找出大学生自信心缺乏的社会、家庭和自身等方面原因，探索解决这一问题的有效方法和手段，有助于为农科院校培养更多合格人才。     

早期隔离断奶仔猪采食行为的观测

选择106头早期隔离断奶仔猪随机分成2组,A组54头采取14日龄断奶,B组52头采取21日龄断奶。全自由采食的条件下,通过观测,记录采食量、采食次数与采食时间间隔、对不同料型的采食兴趣。结果表明,断奶第二天的采食量明显高于第一天,在断奶第2~5d采食量明显较高;断奶后两周内,两组的平均日采食量相对较低,第三周有所上升,在第四周后采食量明显加大;不同阶段的仔猪白天采食次数均高于夜间,并随着仔猪日龄的增长,夜间与全天采食次数逐渐减少,采食间隔延长;不同日龄的仔猪均喜食稠料,且采食稠料的时间最短。     

Reference intervals for Cu,Mg, and Zn in captive gyrfalcons and other falcon species in the United Arab Emirates

Falconry is a long-standing tradition in the United Arab Emirates (UAE), and in 2016, falconry was included by UNESCO in the list of intangible cultural heritage of humanity. The health and wellness of falconry raptors is a priority for the local culture; plasma chemistry analysis plays an important role in monitoring, assessing, and managing diseases in avian patients. Imbalances of Cu, Mg, and Zn have been linked to several diseases in avian species; therefore, determining the reference intervals (RIs) of these minerals has important implications in the clinical management of falcons. We determined the RIs in plasma for Cu, Mg, and Zn in captive (falconry-managed) falcons according to the Quality Assurance and Laboratory Standards Committee of the American Society for Veterinary Clinical Pathology, and the Clinical Laboratory Standards Institute guidelines. Blood chemistry analyses were carried out on 252 clinically healthy falcons examined at the Dubai Falcon Hospital in the UAE: 124 gyrfalcons (Falco rusticolus) and 128 falcons of other species. We observed no significant variation in RIs of Cu (1.5–7.0 µmol/L), Mg (0.49–0.78 mmol/L), or Zn (11.8–34.1 µmol/L) based on different species or sex.     

Modelling the habitat requirement of riverine fish species at the European scale: sensitivity to temperature and precipitation and associated uncertainty

Abstract – Species distribution models (SDMs) have been widely used for different purposes such as studying species niche or forecasting the effects of global change on species distribution. Nevertheless, these models are often calibrated on datasets that only cover a fraction of the species’ realised niches, which could lead to unrealistic results. The aim of this study was to model the habitat requirements of 21 freshwater fish species that are native to Europe, using a dataset that accurately reflects their realised niches. Both temperature and precipitation were used as climatic factors to model the habitat requirements of the species, and the uncertainty associated with the fitted environment–occurrence relationships was examined. The results demonstrated the importance of accounting for these two climatic components when estimating the habitat requirements of riverine fish species and whether the uncertainty associated with model expectations varies with the species and the environmental factor considered. These results are discussed with regard to the known ecology of the 21 riverine fish species and within the perspective of climate change.     

果蔬保鲜环境多因素试验

根据果蔬活体保鲜的生理特性和环境要求,提出了降低果蔬冰温点的方法;并选择温度、湿度和调节剂浓度3个因素,每个因素设置2个水平设计正交试验表,按照正交表进行果蔬活体保鲜试验,对试验结果运用方差分析方法进行了数据分析与优化。结果得出,果蔬保鲜环境的最优组合为A1B1C2,并计算最优组合下试验指标值及其置信区间。     

2014年前3季度中国禽蛋形势及4季度走势

过去两年,严重的流感疫情给中国家禽养殖业带来灾难性影响。尤其是2014年初,肉鸡、蛋鸡存栏量出现大幅下降。而流感疫情的后遗症则是养殖户补栏行动不积极。尽管最近几个月鸡蛋价格迅速走高,但养殖户对流感心有余悸,补栏动作缓慢,部分养殖户甚至退出市场,导致家禽市场将在未来相当长的一段时期处于供给偏紧的状态。