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放牧家畜采食量和择食性测定方法的研究进展 被引量:7
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作者 崔占鸿 《家畜生态学报》 2011年第5期1-4,共4页
文章就国内外关于放牧家畜采食量和采食种类测定方法的研究现状进行了回顾与总结,分析了影响其测定的主要因素,并提出了合理的建议,为今后开展草地放牧家畜的采食量、择食性及其测定方法的研究提供了科学参考。
关键词 放牧家畜 采食量 择食性 测定方法 影响因素
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萍螟、萍灰螟择食性与产卵选择性探讨
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作者 陆培基 林永辉 徐国忠 《福建农业科技》 1994年第1期17-17,共1页
萍螟、萍灰螟择食性与产卵选择性探讨陆培基,林永辉,徐国忠(福建省农科院红萍研究中心350013)萍螟、萍灰螟是红萍夏、秋季节主要的虫害,虫情发生来势猛,如不及时防治,几天内就会使萍田毁灭。经过长期观察我们发现萍螟、萍... 萍螟、萍灰螟择食性与产卵选择性探讨陆培基,林永辉,徐国忠(福建省农科院红萍研究中心350013)萍螟、萍灰螟是红萍夏、秋季节主要的虫害,虫情发生来势猛,如不及时防治,几天内就会使萍田毁灭。经过长期观察我们发现萍螟、萍灰螟对不同种的红萍为害程度是不同的... 展开更多
关键词 萍螟 萍灰螟 择食性 产卵
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链烷烃技术在畜牧生产上的应用 被引量:2
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作者 娄玉杰 刘洪亮 《家畜生态学报》 2006年第6期227-230,共4页
针对在国外被广泛应用的链烷烃技术,对其在植物分类和动物采食量与消化率,择食性,消化动态学上的应用逐一做以阐述,对链烷烃技术的应用做了一个全面的介绍,以使读者对这项技术有一个全新的认识。
关键词 链烷烃 植物分类 采食量 消化率 择食性 指示剂
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Effects of Different Diets on the Dietary Attractability and Selectivity of Chinese Shrimp,Fenneropenaeus chinensis
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作者 HUANGGuoqiang DONGShuanglin WANGFang 《Journal of Ocean University of China》 SCIE CAS 2005年第1期56-60,共5页
Attractabilities of different diets and dietary selectivity of Chinese shrimp, Fenneropenaeus chinensis were studied through behavior observation and feeding experiment, respectively. The five diets used in the experi... Attractabilities of different diets and dietary selectivity of Chinese shrimp, Fenneropenaeus chinensis were studied through behavior observation and feeding experiment, respectively. The five diets used in the experiment are: Fish Flesh (FF), Shrimp Flesh (SF), Clam Foot (CF), Polychaete Worm (PW), and Formulated Diet (FD). No significant differ- ences of attractability exist between any two different diets when every two natural diets or all five diets are provided simul- taneously. On the other hand, significant differences of attractability exist between FD and every single natural diet when they are provided simultaneously. Results of behavioral observation indicate that natural diets are more attractive than FD. In feeding experiment, Chinese shrimp has distinct selectivity on different diets. It positively selects CF and PW, negatively selects FF and SF, and excludes FD absolutely. The results of the present studies indicate that the dietary selectivity of shrimp was based not only on the attractabilities of the diets, but also on the responses such as growth and food conversion. 展开更多
关键词 attractability dietary selectivity chinese shrimp ivlev's selectivityindex
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A preliminary study on food consumption, preference and day-night predatory difference of Asterias amurensis on Scapharca broughtonii
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作者 ZHANG Tian-wen LIU Guang-bin +2 位作者 LIU En-fu ZHENG Yong-yun QIU Zhao-xing 《Marine Science Bulletin》 CAS 2016年第1期69-80,共12页
In order to study the food consumption, preference and day-night predatorydifference of Asterias amurensis on Scapharca broughtonii, the experiments werecarried out at the temperatures ranging from 16 ℃ to 20 ℃, sal... In order to study the food consumption, preference and day-night predatorydifference of Asterias amurensis on Scapharca broughtonii, the experiments werecarried out at the temperatures ranging from 16 ℃ to 20 ℃, salinity of 28.2 ± 2.1,dissolved oxygen of 7.5±0.7 mg/L and pH of 8.0 ± 0.3.The results provided basic datafor promoting steady and healthy development of the multiplication and cultivation of S.broughtonii. The results of food consumption suggested that the food intake of starfishincreased with the density of S. broughtonii at all conditions. The food consumption ofstarfish in different sizes on S. broughtonii in the same size had no significant difference(p>0.05), but it was significantly different among S. broughtonii in different sizes. Thestarfish had the highest feeding rate on the smallest S. broughtonii. Our findings alsoverified the positive relation between the weight of food intake of starfish in differentsizes on the density and size of S. broughtonii. The feeding rhythm of starfish onS. broughtonii in different sizes showed a certain day-night difference, higher at nightthan in the day. The maximum food consumption occurred when the size of S.broughtonii became larger. The results showed that 30 ind/m2 was the suitable seabottom sowing density for S. broughtonii. Our data indicated that the ability to avoidpredators and rivals increased as the shell length rose. Based on prey selectivity,bivalves that have a lower commercial value may be used to clear away A. amurensis. 展开更多
关键词 Asterias amurensis Scapharca broughtonii food consumption food preference day-night difference
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Biofilm Determination of Listeria monocytogenes That Isolated from Different Sources
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作者 Srwa Ali Muhammed 《Journal of Life Sciences》 2014年第10期805-810,共6页
The study was conducted for the detection of Listeria monocytogenes bacteria from different sources (CSF and blood) obtained from patients in Pediatric hospital and from food sources like (yogurt, raw vegetables an... The study was conducted for the detection of Listeria monocytogenes bacteria from different sources (CSF and blood) obtained from patients in Pediatric hospital and from food sources like (yogurt, raw vegetables and raw milk, sausage). Ten isolates were isolated from 150 specimens one of them from CSF and one isolate isolated from blood samples the others isolated from food specimens 6 isolates isolated from sausage and 2 from raw vegetables. Isolates were identified traditionally involved culture methods based on selective enrichment and plating followed by the characterization of Listeria spp. based on colony morphology, sugar fermentation and haemolytic properties, identification by Api listeria was done. Determine the isolates that produce biofilm by tissue culture plate method. The highest biofilm forming strains ofListeria monocytogenes isolates appear in No. (D10, El, E5 and E7) OD reading each of them is (0.13, 0.09, 0.11 and 0.19) respectively, the lowest or poor biofilm forming strains appear in No. (D11, D12, E2, E3, E4 and E6) that optical density (OD) reading are (0.04, 0.03, 0.05, 0.04, 0.05 and 0.03) respectively by comparing with control prepared in well (A12) that stained by crystal violate without putting any isolates and the OD reading is (0.003). Confirmation by PCR was done only for four isolates that produce biofilm (D10 and El) that obtained from CSF and blood sample and for (E5 and E7) that obtained from food samples. 展开更多
关键词 Listeria monocytogenes BIOFILM API PCR OD.
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The Consumption Preferences of Milk and Dairy Products of Undergraduate Students
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作者 Mustafa Mortas Fehmi YaZlCl 《Journal of Food Science and Engineering》 2012年第1期10-14,共5页
Human has different stages in their life as from babyhood to adult. The healthy and balanced diet preferences of people play an important role in each human life parts. Especially milk and dairy products are necessary... Human has different stages in their life as from babyhood to adult. The healthy and balanced diet preferences of people play an important role in each human life parts. Especially milk and dairy products are necessary for human health because of their nutrition value and body functions. One of the parts of people life is university life. Starting university is a turning point in terms of eating habits, since food choices responsibility of university students increases in this period. According to the researches, increasing availability of fast foods, changes in living arrangements, life experiences, expectations, preferences and beliefs related with food selections are most common reasons regarding dietary choices in this young adults group. University students had drinking milk habits in primary school but most of them lose their habits during university life. The students' first preferences were cheese and then yogurt and finally milk. A very little part of university students consume milk and dairy products regularly. The consumption habits and milk and dairy product catering of university students were examined. The consumption preferences of milk and dairy products of the students in different Universities are reviewed in this review. 展开更多
关键词 MILK dairy products consumption preferences undergraduate students.
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Simultaneous variable selection for heteroscedastic regression models 被引量:7
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作者 ZHANG ZhongZhan1 & WANG DaRong2 1College of Applied Sciences, Beijing University of Technology, Beijing 100124, China 2The Pilot College, Beijing University of Technology, Beijing 101101, China 《Science China Mathematics》 SCIE 2011年第3期515-530,共16页
In this paper, we propose a new criterion, named PICa, to simultaneously select explanatory variables in the mean model and variance model in heteroscedastic linear models based on the model structure. We show that th... In this paper, we propose a new criterion, named PICa, to simultaneously select explanatory variables in the mean model and variance model in heteroscedastic linear models based on the model structure. We show that the new criterion can select the true mean model and a correct variance model with probability tending to 1 under mild conditions. Simulation studies and a real example are presented to evaluate the new criterion, and it turns out that the proposed approach performs well. 展开更多
关键词 variable selection heteroscedastic regression models adjusted profile log-likelihood AIC BIC
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