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| 1 | 全颗粒饲料对奶牛生产性能的影响显示文摘饲料中的中性洗涤纤维(NDF)含量和饲料颗粒直径是影响瘤胃功能的重要因素。试验评估了以颗粒饲料为主的奶牛瘤胃健康情况、NDF消化率和生产性能。选取8头荷斯坦母牛(336±30 d,体重346±35 kg),随机分配到交叉重复试验组中,奶牛安置于牛栏,自由采食。试验期为3周,前两周是适应期,最后一周为数据收集期。各组饲粮原料相同,但物理形式不同,分为全混合日粮(TMR)和颗粒料(直径=8 mm)。两组间物理有效NDF(pe NDF)不同,TMR组为39.8%,颗粒料组为11.8%。在试验过程中,干物质采食量(DMI)、饮水量、瘤胃反刍时间、瘤胃温度和pH情况均记录。3周后收集粪样,确定潜在的可消化NDF总消化率(pdNDF)。每阶段结束后计算平均日增重和饲料转化率。颗粒料组的DMI、DMI/体重和饮水量更高。而两组间平均日增重和饲料转化率无显著差异。颗粒料组的瘤胃反刍时间为241 min·d-1低于TMR组的507 min·d-1。饲料的不同物理外形对瘤胃温度、瘤胃pH无显著影响。TMR组的pdNDF总消化率为90.25%高于颗粒料组的86.82%。试验结果表明,动物易接受完整的颗粒饲料,DMI较高,且反刍时间减少,但瘤胃pH无显著变化。TMR组的pdNDF消化率显著增加。尽管两组奶牛在DMI和纤维消化方面表现不同,但总体表现相似,两组饲料的保存时间与其物理形式有关。在短期内,提供能满足NDF需求的完全颗粒饲料可改善瘤胃健康状况和动物生产性能,而较长时间的数据则需要进一步试验。 | Wang J Yang M Cao M Lin Y Che L Q Duraipandiyan V Al-Dhabi N A Fang Z F Xu S Y Feng B Liu G Wu D Bonfante E Palmonari A Mammi L Canestrari G Fustini M Formigoni A | 2016 | 饲料博览2016，0，12： | 2 |
| 2 | Terahertz Semiconductor Quantum Well Devices显示文摘For eventually providing terahertz science with compact and convenient devices,terahertz (1~10THz) quantum-well photodetectors and quantum-cascade lasers are investigated.The design and projected detector performance are presented together with experimental results for several test devices,all working at photon energies below and around optical phonons.Background limited infrared performance (BLIP) operations are observed for all samples (three in total),designed for different wavelengths.BLIP temperatures of 17,13,and 12K are achieved for peak detection frequencies of 9.7THz(31μm),5.4THz(56μm),and 3.2THz(93μm),respectively.A set of THz quantum-cascade lasers with identical device parameters except for doping concentration is studied.The δ-doping density for each period varies from 3.2×1010 to 4.8×1010cm-2.We observe that the lasing threshold current density increases monotonically with doping concentration.Moreover,the measurements for devices with different cavity lengths provide evidence that the free carrier absorption causes the waveguide loss also to increase monotonically.Interestingly the observed maximum lasing temperature is best at a doping density of 3.6×1010cm-2. | Liu H C Luo H Ban D Waichter M Song C Y Wasilewski Z R Buchanan M Aers G C SpringThorpe A J Cao J C Feng S L Williams B S Hu Q | 2006 | Journal of Semiconductors2006，27，4： | 2 |
| 3 | Influence of Eutrophication on the Distribution of Total Mercury and Methylmercury in Hydroelectric Reservoirs显示文摘 | Meng Bo Feng X B Chen C X Qiu G L Sommar J Guo Y N Liang P Wan Q | 2010 | EN2010，，5： | 2 |
| 4 | Encapsulation of enzymes in mesoporous host materials via the nonsurfactant- templated sol-gel process 显示文摘 | Wei Y Xu J G Feng Q W | 2000 | Materials Letters2000，44，1： | 1 |
| 5 | Moving element method for train-track dynamics显示文摘 | Koh C G Ong J S Y Chua D K H Feng J | 2003 | International Journal for Numerical Methods in Engineering2003，56，： | 1 |
| 6 | Metal-semiconductor transition in non-stoichiometric double perovskite Sr2FexMo2-xO6显示文摘 | LIU G Y RAO G H FENG X M | 2003 | Physica B2003，334，： | 1 |
| 7 | Benzyl benzoates:New phlo-rizin analogs as mushroom tyrosinase inhibitors显示文摘 | Fang Y Chen Y Feng G | 2011 | Bioorg MedChem2011，19，3： | 1 |
| 8 | The structural and magnetic properties of Mn2 xFexNiGa Heusler alloys显示文摘 | LUO H Z MENG F B FENG Z Q LI Y X ZHU W WU G H ZHU X X JIANG C B XU H B | 2010 | J Appl Phys2010，107，01： | 1 |
| 9 | Rapamycin alleviates brain edema af- ter focal cerebral ischemia reperfusion in rats 显示文摘 | Guo W Feng G Miao Y | 2014 | Immunopharmacol Immunotoxico12014，36，3： | 1 |
| 10 | Concentration and mode of occurrence of trace elements in marine oil shale from the Bilong Co area,northern Tibet,China显示文摘 | FU X G WANG J ZENG Y H TAN F W FENG X L | | 0，，01： | 1 |
| 11 | High Critical Current Density in Ti-Doped MgB2/Ta/Cu Tape by Powder-in-Tube Process显示文摘 | Fu B Q Feng Y Yan G | | 0，，12： | 1 |
| 12 | DNA methylation of trefoil factor 1 (TFF1) is associated with the tumorigenesis of gastric carcino- ma显示文摘 | Feng G Zhang Y Yuan H | 2014 | Mol Med Rep2014，9，1： | 1 |
| 13 | Effect of Bi203 on physical, optical and structural properties of boron silicon bismuthate glasses 显示文摘 | GAO G HU L L FAN H Y WANG G N LI K F FENG S Y FAN S J CHEN H Y | 2009 | Optical Materials2009，32，： | 1 |
| 14 | Effects of operating parameters on flow field in a turbo air classifier显示文摘 | FENG Y G LIU J X LIU S Z | 2008 | Minerals Engineering2008，21，： | 1 |
| 15 | Infrared-npaeified A1203-SiO2 aerogel composites reinforced by SiC-coated mullite fibers for thermal insulations 显示文摘 | LIU X JIANG Y G FENG J | 2015 | Ceramics international2015，41，1： | 1 |
| 16 | Environmental contamination of heavy metals from zinc smehing areas in Hezhang county, western Guizhou, China 显示文摘 | Bi X Y Feng X B Yang Y G | 2006 | Environ Int2006，32，7： | 1 |
| 17 | Selection of nutrients for prevention or amelioration of lead-induced learning and memory impairment in rats显示文摘 | Fan G Feng C Li Y | 2009 | Ann Occup Hyg2009，53，4： | 1 |
| 18 | A model-free cross-coupled control for position synchronization of multi-axis motions: theory and experiments显示文摘 | SUN D SHAO X Y FENG G | 2007 | IEEE Trans Control Systems Technology2007，15，2： | 1 |
| 19 | Optimal stopping times for end of season sales and optimal stopping times for promotional fares显示文摘 | Feng Y Gallego G | 1995 | Management Science1995，41，： | 1 |
| 20 | Enhancement of metal dispersion and selective acetylene hydrogenation catalytic properties of a supported Pd catalyst 显示文摘 | Feng J T Ma X Y David G E | 2011 | Industrial Engineering Chemical Research2011，50，4： | 1 |
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