葡萄籽粕替代玉米对种鸡产蛋高峰后期生产性能、鸡蛋品质及新城疫抗体水平的影响     

乔利敏  关文怡  马建民 《中国畜牧兽医》2019,46(12):3538-3546

试验旨在研究葡萄籽粕对种鸡产蛋高峰后期生产性能、鸡蛋品质及新城疫抗体水平的影响。选取产蛋率、体重相近,健康状态良好的64周龄罗曼灰父母代种鸡810只,随机分为6组,每组5个重复,每个重复27只鸡。对照组饲喂基础日粮,试验组分别饲喂葡萄籽粕替代基础日粮中3%、4.5%、6%、7.5%、9%玉米的试验日粮（分别为试验Ⅰ、Ⅱ、Ⅲ、Ⅳ和Ⅴ组）。预试期7 d,正试期30 d。探讨日粮中添加不同水平的葡萄籽粕对种鸡产蛋高峰后期生产性能、鸡蛋品质及新城疫抗体水平的影响及其作用机理。结果表明：葡萄籽粕能够明显抑制种鸡产蛋高峰后期生产性能降低,对于日均产蛋量,试验Ⅲ组极显著高于对照组（P<0.01）,试验Ⅰ、Ⅱ组显著高于对照组（P<0.05）;试验Ⅰ、Ⅱ、Ⅲ组产蛋率较对照组分别提高了12.38%、14.76%、18.09%（P<0.05）,各试验组蛋鸡的日均采食量、料蛋比及破软蛋率与对照组相比差异不显著（P>0.05）;葡萄籽粕处理组鸡蛋的哈氏单位、蛋黄重及蛋壳强度均高于对照组,但随葡萄籽粕添加量的增加没有表现出规律性变化;葡萄籽粕能够降低鸡蛋胆固醇含量（P<0.01）;并能够提高种鸡新城疫HI抗体水平（P>0.05）。综上,在种鸡产蛋高峰后期日粮中以葡萄籽粕替代玉米,可提高种鸡生产性能和新城疫抗体效价,改善鸡蛋品质,降低鸡蛋中胆固醇含量,且以替代6%的玉米效果较好。  相似文献   

基于产业结构变化的区域生态环境效应分析与评价——以湖南省常德市为例   总被引：1，自引：1，他引：0  

熊建新陈端吕  彭保发董明辉 《中国农学通报》2013,29(2):65-69

定量分析产业结构变化对生态环境的影响,反映人类经济活动与生态环境的关系.利用不同产业的生态环境影响指数和资料分析法,分析和评价了湖南省常德市“十一五”期间产业结构变化及其生态环境效应.结果表明:(1)产业结构变化对生态环境质量有显著的影响,第一、二产业内部结构层次低,第三产业比重低,容易造成生态环境破坏;(2)产业结构变化的RCⅢSNE值呈现出持续上升趋势,与GDP呈正相关性,对生态环境的干扰与影响程度处于中等水平;各县(区、市)RⅢSNE值呈波动性变化,幅度不大,保持在2.5～3.5,但空间差异明显;(3)三次产业结构对RCⅢSNE值的影响差异明显,第二产业远大于第一、三产业,第一产业中农业＞牧业＞渔业＞林业的结构形势,不利于RⅢSNE值的降低;第二产业中重工业和轻工业对RⅢSNE值的负态影响最强.  相似文献   

软化处理对杨木刨切单板性能的影响     

肖飞  饶文彬  魏娟  关明杰 《林业科技开发》2013,27(4):69-72

采用化学方法对杨木刨切单板进行软化处理试验,为杨木铅笔板的制备提供技术参数。分别采用25%乙二胺、25%氨水、10%NaOH溶液、25%乙酸溶液对杨木单板进行软化处理,测定处理后试件的密度、硬度、抗弯弹性模量等物理力学性能,并与未处理材进行对比。研究结果表明:软化剂的种类、软化时间、软化温度和加压压力对单板力学性能都有一定的影响;最佳软化工艺为:软化剂为25%氨水,软化温度为60℃,软化时间为50 min,加压压力为0.6 MPa。微观构造进一步证明软化后杨木的细胞壁膨润变形,导管破损,软化减弱了细胞壁的骨架作用。  相似文献   

高产香型糯稻新品种渝香糯1号的选育及其栽培技术     

姚雄  唐永群  李经勇  张现伟 《种子》2013,32(6)

渝香糯1号是重庆再生稻研究中心用自育的渝糯优16号与香糯119进行杂交选育的优质香型糯稻新品种.具有丰产稳产性好、品质优、香味浓、抗病性较强、株叶型好及再生力强等优点,2011～2012年2年区试平均产量510.06kg/667m2,较对照黄华占(452.75 kg/667m2)增产12.66％;7个区试点均增产.2012年通过重庆市农作物品种审定委员会审定(编号:渝审稻2012015).  相似文献   

实时定量PCR检测技术研究进展     

王惠  钱冲  郭峰  关超  苏长青  白洪志 《种子》2013,32(6)

传统定量PCR检测方法如内参照法和竞争PCR法,因为在达到平台期后才能对其进行检测,由于PCR扩增已经过了对数期,其检测重复性相对较差.而实时荧光定量PCR技术可直接监测PCR过程中荧光信号的变化,以获得目的区段扩增产物定量的结果,直接可以进行定性分析和定量分析,操作简便无污染.本文通过对实时荧光定量PCR检测技术的原理、分类、方法和应用4个方面阐述实时定量PCR检测技术研究进展.  相似文献   

Experiments on heat loss characteristics in a fully opened cylindrical cavity receiver     

WU Shuangying  XU Lianhui  XIAO Lan  GUAN Jingyu 《保鲜与加工》2013,(6):40-45

The climate has a great impact on highway bridge rubber bearings than on building rubber bearings. In order to study the change of the mechanical properties during the life of the plain chloroprene rubber bearings of highway bridge under freeze-thaw cycle condition, the plain chloroprene rubber bearings were processed 25, 50, 75, 100 times by freeze-thaw cycle in the standard freeze-thaw chamber, then the axial compression tests were carried. The changes of the performance indicators in the bearing capacity , the ultimate compressive strength, vertical stiffness, elastic modulus under different freeze-thaw cycles were analyzed comparatively. The results show that the plain chloroprene rubber bearings are more prone to brittle failure after the freeze-thaw cycle, and the failure phenomena of steel plate exposing or cracks is more serious than the phenomena of the standard specimen. With the increase of the number of freeze-thaw cycle, the ultimate bearing capacity, ultimate compressive strength and compressive elastic modulus of the plain chloroprene rubber bearings decrease. The attenuation formula and decay curve in 50 years of ultimate compressive strength and elastic modulus of compression are analyzed by least square method, the trends of change are both in line with the exponential function. The mechanical properties of plain chloroprene rubber bearings of highway bridge significantly decreased under freeze-thaw cycle condition. therefore, the temperature ranges of plain chloroprene rubber bearings of highway bridge should be strictly controlled, and some suggestions, such as increasing its minimum applicable temperature, usng the natural rubber bearings as much as possible in cold regions, have been given.  相似文献   

竹类植物研究进展   总被引：1，自引：0，他引：1  

肖雄 《四川林业科技》2013,34(1):29-32

本文综述了竹类植物的分类、栽培及开发利用等方面,对竹类植物今后的研究方向提出了建议,也为从事竹类植物科研、生产工作者提供参考.  相似文献   

4种杀虫剂对枸杞红瘿蚊幼虫的药效比较   总被引：1，自引：0，他引：1  

申培增  关参政 《经济林研究》2013,(1):147-149

为了提高对枸杞红瘿蚊幼虫的化学防治效果,选用5%的啶虫脒(EC)、20%的噻虫嗪(WG)、10%的吡虫啉(WP)和1.8%阿维菌素(EC)这4种具有内吸性或渗透性的杀虫剂进行室内和田间药效试验。试验结果表明:5%的啶虫脒2 000倍液、20%的噻虫嗪4 000倍液和10%的吡虫啉2 000倍液对枸杞果内红瘿蚊幼虫均有显著的防治效果,施药后第4天,室内校正防治效果分别为99.08%、98.43%和99.64%,田间校正防治效果分别为98.71%、98.58%和98.45%;而1.8%阿维菌素2 000倍液的防治效果较差,施药后第4天,室内和田间校正防治效果分别为42.27%和38.02%,其与啶虫脒、噻虫嗪和吡虫啉防治效果的差异达到了极显著水平。室内和田间药效试验结果表现一致,该结果能够为生产上枸杞红瘿蚊幼虫的化学防治起到指导作用。  相似文献   

银胶菊对不同土壤盐度的生理适应性     

陈好  陆芳芳  关亚丽 《广西林业科学》2013,42(1):14-19

外来入侵物种在异质性环境下产生可塑性反应是生态入侵的重要机制之一.为了揭示银胶菊(Parthenium hysterophorus)在盐胁迫下的适应特点,通过盆栽试验,研究银胶菊在盐胁迫环境下的生理适应性特点.盐处理浓度分为5个水平,分别为0.00、0.02、0.05、0.10、0.15 mol/L NaCl.处理15天后,测定银胶菊叶片中脯氨酸、丙二醛(MDA)和可溶性糖的含量及POD、SOD和CAT活性.实验结果表明,盐胁迫下银胶菊叶片中脯氨酸、丙二醛和可溶性糖的含量在NaCl浓度为0.02 moL/L时最低,脯氨酸和可溶性糖的含量在NaCl浓度为0.15 mol/L时达到最高值.POD活性与SOD活性与对照相比均有下降,CAT活性与对照相比均有上升,在NaCl浓度为0.05 mot/L时达到最高值.  相似文献   

Preparation and properties of fibers produced from a cellulose/complex PA solvent system precipitating in diverse coagulants     

Rui Xiong  Faxue Li  Jianyong Yu  Panpan Hu  Zhaofeng Liu 《Fibers and Polymers》2013,14(6):926-934

Ethanol, as the first coagulation bath, and several common organic solvents, as well as aqueous solutions of NH₄Cl, NaHCO₃ and NaOH were explored and demonstrated to be adopted as the second coagulation bath for cellulose/phosphoric acid/tetraphosphoric acid (cellulose/complex PA solvent) solution to produce novel cellulose fibers by two-stage dry-wet spinning in a laboratory scale, and effect of coagulants, cellulose concentration, solvent concentration (P₂O₅ concentration) and coagulation temperature on crystal structure and properties of corresponding fibers were investigated. Surface morphology of regenerated fibers as-spun from different coagulants was observed by scanning electronic microscope (SEM), indicating that methanol and 8 wt% NaOH aqueous solution all rendered cellulose fibers relatively dense and smooth surface. X-ray diffraction (XRD) analysis showed that cellulose fiber precipitated from 8 wt% NaOH aqueous solution had pronounced characteristic peak of cellulose II than those of fibers precipitated from other coagulants, and highest crystallinity and orientation. Meanwhile, those two coagulants referred above also gave cellulose fibers relatively higher tensile strength under the same prerequisite. TGA curves exhibited that fibers were thermally stable produced from two salt aqueous solutions (8 wt% NH₄Cl and NaHCO₃) since they had the relatively higher onset decomposition temperatures. By evaluating the effect of cellulose concentration, P₂O₅ concentration and coagulation temperature on the structure and properties of asprepared fibers, it was preferable to produce cellulose fiber from a solution at 20 wt% cellulose concentration, 73 % P₂O₅ concentration, and coagulating in methanol at coagulation temperature of 60 °C at the second-stage.  相似文献