共查询到20条相似文献，搜索用时 140 毫秒
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全国特种养殖信息交易会日前在河北省承德市举行,业内专家对当前特种动物养殖品种市场前景进行了分析。 毛皮动物类:近几年国际裘皮市场复苏,貂、貉、狐毛皮价格 相似文献
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ETD215型多功能膨化机由现代农装科技股份有限公司生产。该机集原料膨化与成品膨化的功能于一身,通过改变配置既可膨化大豆粉、玉米粉、米糠、棉粕、菜粕、豆粕、非蛋白氮(玉米尿素)、鱼粉、动物下脚料等各种原料,也可膨化配合饲料、宠物饲料和浮性水产料,同时亦可用于油脂加工 相似文献
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挤压膨化技术业已成为发展速度最快的饲料加工新技术.对农作物秸秆进行挤压膨化加工用做饲料,有助于缓解我国饲料粮供应紧张状况,具有重要的现实意义.为此,介绍了秸秆膨化加工的设备及膨化原理,总结了膨化加工的关键工艺流程,分析了膨化前后农作物秸秆的细胞结构变化和营养成分的变化,并对今后秸秆挤压膨化技术的研究方向进行了探讨. 相似文献
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颗粒饲料、膨化饲料和膨胀饲料的大规模生产,已成为世界饲料工业的一个发展趋势。据不完全统计,现有饲料产品中,70%以上是经过热加工（调质、制粒或膨化）处理的[1]。颗粒料和膨化饲料生产过程中高温、高压和高湿不仅为饲料调质、制粒或膨化所必需,经过熟化处理,可使淀粉糊化,提高消化吸收率; 相似文献
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玉米经挤压膨化后,其淀粉结构转化为α型式,即玉米淀粉的糊化,这有助于乳猪肠道的消化吸收与消化率的改善。乳猪料配方中所含玉米粉的比例较高,饲料成本所占比率亦高,故其饲养效果更受营养研究人员所重视,但这方面的资料较少。本文试图在玉米淀粉糊化和乳猪饲料中玉米淀粉糊化度(α值)究竟多少合适以及采用什么加工方式可获取其合适的糊化度方面做一探讨。 相似文献
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YB3A型玉米联合收割机底盘机架强度分析方法研究 总被引：3，自引：0，他引：3
研究了玉米联合收割机机架强度分析的方法,验证了底盘机架设计的可行性.机架的有限元计算模型以往多采用梁单元进行离散化,但采用梁单元不能得到详细的车架应力分布结果,尤其不能得到车架局部如横梁与纵梁连接处的应力状况,而连接处的应力水平较高且变化剧烈,因此采用了板壳单元建立车架模型.对原始方案和改进方案进行对比分析发现,改进方案应力分布和刚度方面均较好,并且节省钢材. 相似文献
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The life cycle impacts of feed for modern grow-finish Northern Great Plains US swine production 总被引：1，自引：0，他引：1
James J. Stone Christopher R. DollarhideJennifer L. Benning C. Gregg CarlsonDavid E. Clay 《Agricultural Systems》2012,106(1):1-10
A life cycle assessment (LCA) model was developed to analyze the environmental impacts per head of swine for typical feed rations of Northern Great Plains (NGP) US grow-finish swine production. The all-inclusive ‘field to gate’ approach incorporated steps ranging from corn and soybean production to shipping the market weight pig to a slaughtering facility. Feed production scenarios included: (1) a standard feed diet of 72% corn and 28% soymeal using 100% synthetic fertilizer; (2) standard feed diet using 40% manure as fertilizer; (3) modified feed diet using dry distillers gains with solubles (DDGS), with 100% DDGS allocation towards ethanol production; and (4) modified feed diet with 50% DDGS allocation towards ethanol production. For the standard NGP feed diet, enteric emissions and feed production were the two largest contributors towards climate change impacts, while feed production further resulted in significant contributions towards human health damage (44.6%), ecosystem diversity (67.4%), and resource availability (75.0%). DDGS incorporation assuming 100% allocation reduced corn and soymeal inputs considerably, resulting in overall decrease in impacts associated with climate change (−2.7%), terrestrial acidification (−7.1%), and both marine (−14.6%) and freshwater eutrophication (−22.7%); however terrestrial ecotoxicity increased (+22.9%) due to natural gas drying. 50% DDGS allocation increased all impact categories, with the greatest change found for terrestrial ecotoxicity (48.4%). The study results highlight the significant LCA impact contributions associated with feed during grow-finish swine production, and the benefits associated with DDGS incorporation; however, LCA benefits were realized only if 100% DDGS allocation was applied towards ethanol production. 相似文献
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This paper estimates the expected economic benefits of investment in two alternative research programmes to improve yields of cassava in Colombia. The benefits from an industrial cassava variety for the animal feed market are compared with those from a higher quality cassava suitable for the fresh food market. A linear programming least-cost feed mix model is used to calculate the cost reduction is poultry feed due to new cassava technology. The impact of this cost reduction is traced through single equation models of poultry supply and demand in order to estimate social benefits in an ex ante consumer surplus framework. Costs of the alternative research programmes are projected and internal rates of return are calculated. 相似文献
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Economic analysis of rainwater harvesting and irrigation methods, with an example from China 总被引：4，自引：0，他引：4
The purpose of this paper is to evaluate the economic feasibility of agriculture with rainwater harvesting and supplemental irrigation in a semiarid region. The results show the importance of making full use of every open-air hardened surface to collect rainwater and to establish rainwater catchment areas by utilizing unoccupied land. The results also show that the usefulness of the harvested rainwater is enhanced when water saving and prevent seepage techniques are employed. The results indicate that in order to maximize investment it is essential to select crops with a water requirement process that coincides with local rainfall events. Potato was found to be the most suitable crop in the studied region. The economic indices for potato were superior to spring wheat, corn and wheat/corn intercropping. Therefore, potato production using rainwater harvesting and supplemental irrigation is the best alternative for cropping systems in the semiarid region of Gansu, China. 相似文献
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青贮玉米饲料籽粒破碎装置仿真分析与试验 总被引：1，自引：0，他引：1
籽粒破碎技术是提高青贮玉米饲料品质的关键技术,也是制约青贮玉米饲料机械化装置的瓶颈。采用SW三维建模、离散元法和田间试验相结合的方法,探究全株玉米离散元模型,模拟籽粒破碎作业过程中破碎对辊与玉米秸秆、玉米籽粒相互作业的过程;并对破碎对辊进行力学分析,用全株玉米粘结接触模型对对辊间破碎过程进行仿真试验,最后通过田间试验验证仿真结果的真实性。旨在研究青贮玉米籽粒破碎装置中不同工作参数对其运行质量及籽粒破碎率的影响,提高破碎装置的效率,进一步优化其结构。结果表明:在秸秆、玉米芯及籽粒的压缩和剪切试验中,设定加载速度为4 mm/min,对辊间隙为2 mm时,玉米秸秆和玉米芯轴向压缩最大临界破裂载荷均近似为2 360 N,玉米籽粒则近似为48 N,玉米秸秆和玉米芯径向最大临界剪切力分别为625 N和840 N,玉米籽粒则为23 N,破碎率达到最大值96%,仿真结果与试验结果保持一致,表明本文建立的三维离散元模型可应用于仿真青贮玉米籽粒破碎装置工作过程中的破碎情况,试验结果满足玉米籽粒破碎质量要求,为进一步研究籽粒破碎机理,分析籽粒破碎的影响因素提供理论依据和技术支持。 相似文献
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玉米秸秆本身营养成分含量低,需作为粗饲料和其它饲料混合生产全混合日粮或经黄贮等技术工艺改善其品质。为在利用和改善处理过程中对其营养成分含量进行实时检测,采用217个玉米秸秆样品,利用优化后的近红外在线光谱采集系统,探索了利用近红外光谱技术在线检测玉米秸秆水分、粗蛋白、酸性洗涤纤维和可溶性糖等营养成分含量的可行性。研究结果表明利用近红外光谱技术可以实现对玉米秸秆饲料营养成分的定量分析。水分、粗蛋白、酸性洗涤纤维、可溶性糖含量模型的相对标准偏差和相对分析误差分别为9.03%和1.97、11.36%和2.31、3.75%和2.02、16.18%和3.61。 相似文献