氧化锌法诱导肥肝型种鹅换羽效果的研究   总被引：1，自引：0，他引：1  

薛海振  王宝维  葛文华  刘腾  岳斌  张名爱  周小乔  舒常平 《中国家禽》2011,33(22)

以肥肝型种鹅为研究对象,研究缩短鹅换羽期的方法,以解决种鹅季节性繁殖、年产蛋量低的技术难题.采用完全随机设计,选取24月龄青农灰鹅128只,饲喂2％氧化锌日粮,按照目标体重下降0(对照组)、20％(第1组)、25％(第2组)、30％(第3组)进行分组设计,对羽毛脱落速度、体重及产蛋率进行统计并比较分析.结果显示:①拔毛前,主翼羽和副主翼羽脱落量,第3组极显著高于第1组和对照组(P＜0.01),与第2组差异不显著(P＞0.05);②达到目标体重所需的时间,第3组极显著多于对照组(P＜0.01),显著多于第1组(P＜0.05),与第2组差异不显著(P＞0.05);③第3组的开产日龄,极显著早于第1组和对照组(P＜0.01),与第2组差异不显著(P＞0.05);达到32％产蛋率时的换羽日龄,第3组显著早于第1组(P＜0.05),极显著早于对照组(P＜0.01),与第2组差异不显著(P＞0.05);④试验期间的死淘率,第3组极显著高于第1组和对照组(P＜0.01),显著高于第2组(P＜0.05);⑤血液中微量氧化锌变化可以减少鹅采食量.表明,肥肝型种鹅饲喂13d添加2％氧化锌的日粮,体重下降25％的诱导换羽方法,死淘率较低,能够缩短换羽期,提高年产蛋量.  相似文献   

In situ phytoremediation of PAH-contaminated soil by intercropping alfalfa (<Emphasis Type="Italic">Medicago sativa</Emphasis> L.) with tall fescue (<Emphasis Type="Italic">Festuca arundinacea</Emphasis> Schreb.) and associated soil microbial activity     

Mingming Sun  Dengqiang Fu  Ying Teng  Yuanyuan Shen  Yongming Luo  Zhengao Li  Peter Christie 《Journal of Soils and Sediments》2011,11(6):980-989

Purpose  

A 7-month field experiment was conducted to investigate the polycyclic aromatic hydrocarbon (PAH) remediation potential of two plant species and changes in counts of soil PAH-degrading bacteria and microbial activity.  相似文献   

基于气味与颜色的脊尾白虾新鲜度评价   总被引：4，自引：3，他引：1  

唐琳  屠康  潘磊庆  惠腾  陈晓博  谢一平  刘明  刘鹏 《农业工程学报》2011,27(9):344-348

该文旨在建立一种检测脊尾白虾新鲜度的无损检测方法,利用电子鼻与色差仪研究在4℃冷藏条件下不同新鲜度脊尾白虾的气味和颜色的变化规律,分别建立气味、颜色、气味结合颜色的3种新鲜度等级预测模型,并进行比较分析。结果表明,根据LAB表色系统,b*值随脊尾白虾鲜度的劣变呈正向线性相关;电子鼻可将不同新鲜度等级的脊尾白虾进行准确区分,并确定了反映其新鲜度变化的气敏传感器有5个（S6、S7、S8、S9、S10）;利用气味、颜色、气味结合颜色建立的3个新鲜度等级预测模型都具有可行性（平均准确率≥90.0%）,其中气味结合颜色建立的预测模型准确率最高,达到98.8%,依次为气味、颜色模型。因此,可根据气味结合颜色的预测模型对脊尾白虾新鲜度等级进行预测。  相似文献   

Optimization of the Adsorption Conditions for the Decolorization and COD Reduction of Methylene Blue Aqueous Solution using Low-Cost Adsorbent     

Ling Wei Low  Tjoon Tow Teng  Abbas F. M. Alkarkhi  Anees Ahmad  Norhashimah Morad 《Water, air, and soil pollution》2011,214(1-4):185-195

The performance of raw bagasse (RB), and tartaric acid-modified bagasse (TAMB) as adsorbents on decolorization and chemical oxygen demand (COD) reduction of methylene blue (MB) aqueous solution was studied. The effects of five factors namely: adsorbent dosage, pH, shaking speed, contact time, and temperature on decolorization and COD reduction were studied and optimized using central composite design (CCD). The results of the analysis show that all selected factors exhibit significant effect on decolorization and COD reduction. Maximum decolorization (78.16%) and COD reduction (77.95%) for RB was achieved at 0.82 g of adsorbent dosage, pH 9.4, 122 rpm of shaking speed, 44 min of contact time, and 55°C. For TAMB, maximum decolorization (99.05%) and COD reduction (98.45%) was achieved at 0.78 g adsorbent dosage, pH 9.4, shaking speed of 120 rpm, 34 min contact time, and 49°C. TAMB was found to be more effective than RB in decolorization and COD reduction of MB aqueous solution.  相似文献   

Optimization of Cu(II) Extraction from Aqueous Solutions by Soybean-Oil-Based Organic Solvent Using Response Surface Methodology     

Siu Hua Chang  Tjoon Tow Teng  Norli Ismail 《Water, air, and soil pollution》2011,217(1-4):567-576

This study aimed to optimize two process variables, namely extractant concentration, i.e., di-2-ethylhexylphosphoric acid concentration ([D2EHPA]) and equilibrium pH (pH_eq), in Cu(II) extraction from aqueous solutions with a soybean-oil-based organic solvent using response surface methodology by maximizing the percentage extraction (%E). A central composite design was applied, and a regression model for %E was developed. Adequacy of the model was examined, and it was found to be statistically significant. The optimum conditions were determined as follows: [D2EHPA] of 84.71?mM and pH_eq of 4.46, which resulted in 99.78% of %E. The experimental value of %E (98.17%) obtained is found to agree satisfactorily with that (99.78%) predicted from the model.  相似文献   

近30年昌都地区霜的变化特征分析     

孙晓光  王腾  李白萍  陆奎勇  姜子平 《中国农业气象》2011,(Z1)

利用昌都地区7个站点的气象观测资料建立时间序列,运用趋势分析、相关分析等方法研究分析1980-2009年30a昌都地区霜的分布特征、变化趋势以及初终霜对温度变化的响应。结果表明:初霜期明显推迟,终霜期有所提前,无霜期延长明显(P<0.01),近30a约增加36d,进入21世纪这种趋势更加明显;初霜日推迟、终霜日提前,无霜期延长主要是由该地区温度升高引起的,其中,月平均最低气温和平均最低地面温度的贡献较其它温度项大。研究霜的变化特征旨在为农牧业生产的调整和布局提供参考。  相似文献   

Overcoming pre-fertilization barriers in the wide cross between Chrysanthemumgrandiflorum (Ramat.) Kitamura and C. nankingense (Nakai) Tzvel. by using special pollination techniques     

Chun-Qing Sun  Zhi-Zhe Huang  Yan-Li Wang  Fa-Di Chen  Nian-Jun Teng  Wei-Min Fang  Zhao-Lei Liu 《Euphytica》2011,178(2):195-202

In our earlier study, pre-fertilization barrier was one of the main factors causing the failure of the wide hybridization between Chrysanthemum grandiflorum ‘Yuhuaxingchen’ and C. nankingense, and seriously restricted the utilization of the excellent chrysanthemum germplasm, C. nankingense. In order to overcome the pre-fertilization barrier and obtain some hybrids, we carried out wide hybridization between them again in this study, and tentatively adopted three pollination techniques including mentor pollen, delayed pollination, and gibberellic acid treatment. The average number of pollen grains germinating on stigma at 24 h after pollination and the percentage of embryo were investigated with a temporary mount method and the technique of fluorescence microscopy. It was found that, compared with the control, delayed pollination, gibberellic acid treatment, and mentor pollen significantly increased the average number of pollen grains germinating on each stigma at 24 h after pollination by approximately 152, 235, and 182%, respectively. In addition, all the three pollination techniques significantly increased the percentage of normal embryos at different periods after artificial pollination in comparison to the control. Furthermore, seed sets of the crosses using the three special pollination techniques were 1.1, 1.4, and 2.0%, respectively, whereas we did not obtained any seeds in the control. Taken together, these results suggest that delayed pollination, gibberellic acid treatment, and mentor pollen are three useful pollination techniques for overcoming pre-fertilization barriers and increasing seed set in the wide hybridization between C. grandiflorum ‘Yuhuaxingchen’ and C. nankingense, and they may be widely applied for increasing breeding efficiency in other chrysanthemum wide hybridization facing similar pre-fertilization barriers.  相似文献   

竹材染色效果影响因素初步探讨   总被引：1，自引：0，他引：1  

王新建  盖端阳  张腾  余领旗  孙照斌 《林业机械与木工设备》2011,39(2)

采用加压浸注液体渗透法对龙竹竹材进行染色处理试验。用均染性、日晒牢度、水洗牢度、色度、逼真度等对染色效果进行评价。结果表明:染色液体种类、液体浓度、压力大小、竹材构造和化学性质等对竹材染色效果均有影响。  相似文献   

济南市马鞍山路道路绿化景观模式分析研究     

尚红  滕祺  李伟光  张杰 《山东林业科技》2011,(6):34-36,23

城市道路绿地是城市绿地系统的重要组成部分,是人们了解一个城市、感受城市景观特色与文化的重要窗口。作者通过对济南市马鞍山路道路绿化的实地调研,结合其道路性质及周边环境,分析现有绿化景观模式的优缺点,并给予相应的景观评价;针对目前济南市老城区道路绿化改建过程中行道树的选择、保护与移植等问题,探求适合该类城市道路绿化建设的景观模式。  相似文献   

吉林省林木主要刺吸类害虫分布与危害规律研究     

刘生冬  任生  郑军  滕世杰  范红军  戴永义 《林业科技情报》2011,(4):9-11

本文对吉林省主要林木刺吸类害虫柳蛎盾蚧（Lepidosaphes salicina Borchs.）,水木坚蚧Parthenolecanium corni（Bouche）,日本松干蚧Matsucoccus matsumurae（Kuwana）,落叶松球蚜指名亚种Adelges laricis laricis Vallott,红松球蚜Pineuscembrae pinikoreanus Zhang et Fang和柳尖胸沫蝉Aphrophora costalis Matsumura的形态特征、分布及危害规律进行了详细的介绍,并提出了对各类害虫的防治方法。  相似文献