Upper body movement analysis of multiple limb asymmetry in 367 clinically lame horses     

Suphannika Phutthachalee  Kathrin Mählmann  Suvaluk Seesupa  Christoph Lischer 《Equine veterinary journal》2021,53(4):701-709

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Proteomic profiles during adventitious rooting of Eucalyptus species relevant to the cellulose industry     

de Almeida  Márcia Rodrigues  Schwambach  Joséli  Silveira  Vanildo  Heringer  Angelo Schuabb  Fett  Janette Palma  Fett-Neto  Arthur G. 《New Forests》2020,51(2):213-241

New Forests - Adventitious rooting (AR) is an obligatory step for vegetative propagation of commercial woody species. Paper industries have interest in Eucalyptus globulus Labill and its hybrids...  相似文献   

耐热小麦生理特征分析     

吕丽华  李谦  雷明帅  姚艳荣  贾秀领 《华北农学报》2020,35(z1):138-144

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Effects of Feeding Frequency on Apparent Energy and Nutrient Digestibility/Availability of Channel Catfish,Ictalurus punctatus,Reared at Optimal and Suboptimal Temperatures          下载免费PDF全文

Menghe H. Li  Penelope M. Lucas 《Journal of the World Aquaculture Society》2017,48(1):132-136

This study examined the effects of feeding frequency (daily versus every other day [EOD]) on nutrient digestibility/availability of channel catfish, Ictalurus punctatus, reared at optimal (30 C) and suboptimal (24 C) temperatures. A 28% protein practical diet was used as the test diet, and chromic oxide was used at 0.75% of the diet as a maker. Twenty channel catfish of a mean weight of 141 g/fish were stocked into 12 flow‐through aquaria (110 L). Fish were fed daily or EOD to apparent satiation for 7 d before fecal samples were collected by the dissection method. Fish fed EOD to apparent satiation consumed more diet on days fed than those fed daily, and fish reared at 30 C consumed more diet than those reared at 24 C. Neither feeding frequency nor water temperature significantly affected apparent digestibility coefficients for energy and protein and apparent availability coefficients for total amino acids. Results show no advantage by feeding EOD over feeding daily on nutrient digestibility and diet utilization efficiency.  相似文献   

Evaluation of mechanical properties of jute/glass/carbon fibers reinforced hybrid composites     

M. A. Abd El-baky 《Fibers and Polymers》2017,18(12):2417-2432

A study on the tensile and flexural properties of jute-glass-carbon fibers reinforced epoxy hybrid composites in inter-ply configuration is presented in this paper. Test specimens were manufactured by hand lay-up process and their tensile and flexural properties were obtained. The effects of the hybridization, different fibers content and plies stacking sequence on the mechanical properties of the tested hybrid composites were investigated. Two-parameter Weibull distribution function was used to statistically analyze the experimental results. The failure probability graphs for the tested composites were drawn. These graphs are important tools for helping the designers to understand and choose the suitable material for the required design and development. Results showed that the hybridization process can potentially improve the tensile and flexural properties of jute reinforced composite. The flexural strength decreases when partial laminas from a carbon/epoxy laminate are replaced by glass/epoxy or jute/epoxy laminas. Also, it is realized that incorporating high strength fibers to the outer layers of the composite leads to higher flexural resistance, whilst the order of the layers doesn’t affect the tensile properties.  相似文献   

Silage and total mixed ration hygienic quality on commercial farms: implications for animal production          下载免费PDF全文

T. Cogan  R. Hawkey  E. Higgie  M. R. F. Lee  E. Mee  D. Parfitt  J. Raj  S. Roderick  N. Walker  P. Ward  J. M. Wilkinson 《Grass and Forage Science》2017,72(4):601-613

Implications of silage hygienic quality for animal production were investigated on forty‐five dairy farms in South West England. Samples of grass and maize silages and of total mixed rations (TMR) were obtained together with information on silage technology, herd size and animal production. Samples were analysed for mycotoxins, bacteria, yeasts, moulds and chemical composition. Thirteen mycotoxins were assayed, but none were detected in the samples of grass silage. However, mycotoxins were found in 0·9 of all maize and other silage samples, with deoxynivalenol and zearalenone predominating. There was no relationship between total mycotoxin concentration and mean lactation milk yield per cow. Enterobacteria counts tended to be higher in maize silage than in grass silage and higher still in TMR – a cause for concern. There were no relationships between mould counts and mycotoxin concentrations in silages, implying that mycotoxins may have been produced in the field pre‐ensiling.  相似文献   

Paternal genomotype affects female growth in a hybrid fish complex          下载免费PDF全文

Sara Carona  Maria J. Collares‐Pereira  M. Filomena Magalhães 《Ecology of Freshwater Fish》2017,26(4):719-721

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Spatiotemporal patterns of mountain whitefish (Prosopium williamsoni) in response to a restoration of longitudinal connectivity          下载免费PDF全文

Peter M. Kiffney  Ben Cram  Paul L. Faulds  Karl Burton  Michele Koehler  Thomas P. Quinn 《Ecology of Freshwater Fish》2018,27(4):1037-1053

To examine the role of longitudinal connectivity on the spatial and temporal dynamics of mountain whitefish (Prosopium williamsoni), we quantified movement and population dynamics following installation of the Landsburg Dam fishway, Cedar River, WA, USA. Mountain whitefish is widely distributed, poorly studied and not the focus of restoration. Before the fishway, mountain whitefish were not observed above the dam. Here, we focus on snorkel counts collected at reach and mesohabitat (e.g. pools) scales over 11 summers on the 20‐km above‐dam segment following restoration. A camera within the ladder provided number, size and movement timing, thereby informing on behaviour and recolonisation. Segment‐scale abundance increased following fish passage reaching an asymptote in 7 years, and mountain whitefish were detected throughout the main stem in 10 years. Annual movement through the ladder increased over time and was positively correlated with instream abundance and discharge, but negatively correlated with water temperature. About 60% of fish movements occurred in spring and early summer, potentially for foraging opportunities. Reach‐scale abundance peaked between 7 and 10 km from the dam; deep, cool (~10.6 to 11.6°C) conditions characterised these reaches. At the mesohabitat scale, mountain whitefish detection increased with depth and velocity after accounting for distance from the dam. Our results show how restoring longitudinal connectivity allowed this nontarget species to colonise newly available habitat. Their response supports the critical roles of longitudinal connectivity and environmental conditions, that manifest at different spatial scales, in dictating how freshwater fish respond to habitat disturbance.  相似文献   

Soil protection for a sustainable future: options for a soil monitoring network for Ireland          下载免费PDF全文

L. O'Sullivan  F. Bampa  K. Knights  R. E. Creamer 《Soil Use and Management》2017,33(2):346-363

The increased recognition of the importance of soil is reflected in the UN Post‐2015 Development Agenda with sustainable development goals that directly and indirectly relate to soil quality and protection. Despite a lack of legally binding legislation for soil protection, the European Commission remains committed to the objective of soil protection. However, the achievement of a legally binding framework for soil protection relies on the implementation of a soil monitoring network (SMN) that can detect changes to soil quality over time. As beneficiaries do not pay for the provision of soil information, the options for soil monitoring are limited. The use of existing data sets should be considered first. Using Ireland as an example, this research explored the opportunities for a SMN for Ireland considering three existing national data sets. The options for a SMN are considered in terms of their spatial and stratified distribution, the parameters to be measured and an economic analysis of the options proposed. This research finds that for Ireland, either a 10 or a 16 km² grid interval stratified by land use and drainage class offers the best potential in relation to the spatial distribution of existing data sets to reflect local data at a national level. With existing data, the stratified SIS data using the 16 km² grid offers the best value for money, with baseline costs for analysis, excluding field costs, of between €706 481 and €2.8 million. Acknowledging the impossibility of measuring all parameters with ideal frequency, this study proposes a two‐tier system for optimized monitoring frequency. Parameters must anticipate future policy requirements. Finally, the implementation of a SMN must be accompanied by standardized methods, defined thresholds and action mandates to maintain soil quality within allowable limits.  相似文献   

木材硅石改性剂的制备工艺   总被引：1，自引：0，他引：1  

石媛  吕文华  刘强强 《东北林业大学学报》2020,(2):104-108

为了降低木材硅化改性成本促其应用,直接将固态硅石粉高效液态活化,通过正交试验和极差分析优化制备了木材硅石改性剂,测试分析了浸渍改性杨木的性能。结果表明:①反应时间和原料n(SiO2)∶n(NaOH)对活化溶液的pH值、黏度和密度影响不显著,碱料种类和反应温度对活化溶液的黏度、密度、SiO2转化率、固体质量分数和生产成本影响显著,对溶液性能综合影响最大的是反应温度和碱料种类,其次是n(SiO2)∶n(NaOH)和反应时间;②pH值随反应时间、温度和n(SiO2)∶n(NaOH)增大而减小,密度、黏度、固体质量分数、SiO2转化率和模数随反应时间、温度和n(SiO2)∶n(NaOH)增大而增大,KOH活化效果更好但价格较高,综合平衡优化工艺为:反应温度200℃、碱料为NaOH、n(SiO2)∶n(NaOH)=1.715∶1、反应时间4 h;③硅石改性剂能充分渗入杨木,使其吸药量达252%,密度提高81%,抗弯强度提高69.6%,炭化温度减小89℃,残炭率提高41%,改性效果优于硅溶胶。  相似文献