Opportunities for investment into small ruminant breeding programmes in Brazil

The social contribution of goat and sheep industries is very important to many Brazilian families mainly in semi‐arid regions of the country. However, the productive chains of these two species in Brazil are unorganized and ultimately informal. On the other hand, there is potential for growth and development to which an upscaling of breeding programmes will be essential. Historically, many attempts to structure these programmes have been unsuccessful. Inadequate understanding of how to achieve genetic improvement often leading to distributing unsuitable exotic genetics among the producers is one of the reasons for the failure. Another important factor is related to the sources of funding and the priorities for the use of funds. According to the experience and the state of the art in Brazil, the priorities for funding must be in the characterization of the different systems and animal genetic resources, organization of information collection procedures and national databanks, training of technicians and producers and development of system to enable animal evaluation.     

技术进步对新疆水利工程经济效益增长的贡献

介绍了线性生产函数估算技术进步的方法,并运用该方法计算了技术进步对新疆水利工程经济效益增长的贡献份额。     

台湾桂竹高产稳产密度效应的研究

本文应用台湾桂竹产区内２３６块丰产林标准地材料配制出竹林密度效应模型Ｗ＝０．０９７５５５Ｎ１．１６４３４４Ｄ１．８７７７６５,相关系数Ｒ＝０．９８,Ｆ检验值为１０８,偏相关系数Ｒ１＝０．９２,Ｒ２＝０．５８,检验结果达到极显著相关,对该模型进行生产弹性分析,边际产量分析,结果表明它可为现有台湾桂竹林的经营管理、竹林密度调整提供的理论依据．     

天然马尾松林密度效应规律研究

应用天然马尾松林样地资料, 比较和筛选了天然马尾松林密度效应模型, 并对密度效应最优模型进行了生产弹性分析和边际产量分析, 测定了天然马尾松林密度的生产弹性值和边际产量     

福建省杉木人工林材性产区效应的研究 Ⅱ.木材力学性质

通过对福建省不同产区杉木人工林木材力学性质的测定和分析, 结果表明： 杉木人工林木材力学性质的产区间效应大于产区内效应, 产区间木材力学性质差异极显著, 产区内除端面硬度和径面硬度外的其它力学强度指标差异不显著; 一般产区杉木人工林木材各项力学强度较中心产区和边缘产区的稍高, 中心产区和边缘产区的杉木人工林木材各项力学强度相近     

复方黄芪提高肉鸡生产性能与抗病效果研究

 用黄芪、陈皮、大蒜、白术等配成复方制剂按1%添加日粮中饲喂三黄快大型肉用鸡,结果表明：各个饲养阶段试验组比对照组肉鸡增重差异均显著(P<0.05),肉鸡料重比降低差异均显著(P<0.05)。整个试验期试验组鸡死亡率比对照组降低了71.43%。平均每只鸡获利试验组比对照组提高了47.67%,欧洲效益指数提高了45.45%。这种中草药制剂能提高肉鸡生产性能,增强抗病效果,具有明显的经济效益。     

Biochar reduces uptake and accumulation of polycyclic aromatic hydrocarbons (PAHs) in winter wheat on a PAH-contaminated soil

For years, biochar has been successfully used for the remediation of polycyclic aromatic hydrocarbons(PAHs) in contaminated soils, not only for improving their removal from soil but also for reducing their uptake by crops. However, the underlying mechanism of biochar application reducing PAH uptake and accumulation in winter wheat remains unclear. Pot trials were conducted on a PAH-contaminated soil amended with bamboo biochar, coconut shell biochar,and maize straw biochar(MSB) for an entire gro...     

河北省作物生产潜力及人口承载力研究

本文采用改进的农业生态区域法,将河北省分成8个农业自然区进行分析,计算了春小麦、春玉米、冬小麦、夏玉米4种主要作物的光温生产潜力,经过降水、自然灾害、土地质量等自然因素订正,分析了河北省作物生产潜力。通过对农田投入水平、历年来粮食作物产量分析,预测了河北省2010年和2030年粮食潜力总产,采用一元线性回归模型与GM(1,1)模型预测了2010年和2030年人口数量、耕地面积及粮食单产发展趋势,结合宽裕型、小康型、富裕型3种消费水平分别预测了预测期内土地资源人口承载力状况;最后提出了河北省土地资源可持续发展的战略对策。     

复合微生物对奶牛生产性能及血液生化指标的影响

为探讨相同日粮条件下添加不同水平复合微生物添加剂对奶牛生产性能和血液生化指标的影响,选用产后(87.4±6)d的中国荷斯坦奶牛70头,采用随机区组试验设计,分为5组。试验期67 d,预饲期7 d。结果表明,与对照组相比,试验Ⅰ、试验Ⅱ组产奶量显著提高(P<0.05);试验Ⅳ组乳脂率显著提高(P<0.05)。添加微生物制剂对乳蛋白率、乳糖率、总固形物无显著影响,乳中体细胞数(SCC)显著下降(P<0.05);血清中超氧化物歧化酶(SOD)与对照组相比,试验Ⅲ提高11.55%(P<0.05),试验Ⅳ提高11.98%(P<0.01);对血液中谷胱甘肽过氧化物酶(GSH-Px)含量无显著影响(P>0.05);丙二醛(MDA)含量均显著低于对照组(P<0.05)。     

论加快适应国内消费市场需求的农产品生产

由于国际金融危机的影响,立足国内,加快适应国内消费市场需求的农产品生产已成为新形势下农业发展的重要选择。分析了现阶段国内农产品消费市场及其赋予农产品的诸多新特点,论述了通过合理利用以农地、农业劳动力、农业工厂化、农业科技等为主导的农业生产要素,保障新的农产品的生产供给。