Creation of a predictive equation to estimate fat-free mass and the ratio of fat-free mass to skeletal size using morphometry in lean working farm dogs     

YM Leung  BAS Hodgson 《New Zealand veterinary journal》2018,66(5):248-256

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Cloning and characterization of chicken growth hormone binding protein (cGHBP)     

Lau JS  Yip CW  Law KM  Leung FC 《Domestic animal endocrinology》2007,33(1):107-121

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Technical efficiency of carp production in Nepal: An application of stochastic frontier production function approach*     

Khem R. Sharma  Pingsun Leung 《Aquaculture Economics & Management (Blackwell Science)》2013,17(3):129-140

Abstract

Modern aquaculture is a relatively new activity among Nepalese farmers and a small contributor to the economy. Given the abundance of water resources and fish species, rising demand for fish, and its high profitability, aquaculture has potential for future expansion if it is given appropriate attention from the government. In Nepal, productivity in aquaculture is much lower compared to other countries in the region, which suggests that there is potential for increased fish production through technological progress and improvement in farm‐level technical efficiency. However, no formal analysis has yet been conducted to assess the productive performance of Nepalese aquaculture and its potential for future improvement. Against this background, this paper examines the technical efficiency and its determinants for a sample of fish pond farms from the Tarai region of the country using a stochastic production frontier involving a model for technical inefficiency effects. The estimated mean technical efficiency is 77%, with intensive farms being more efficient than extensive farms. The adoption of regular fish, water, and feed management activities has a strong positive effect on technical efficiency.  相似文献   

A review of production frontier analysis for aquaculture management     

Khem R. Sharma  Pingsun Leung 《Aquaculture Economics & Management (Blackwell Science)》2013,17(1-2):15-34

Abstract

This paper examines recent advances in production economics with special reference to efficiency measurement using production frontiers and its implications for aquaculture management. Compared with agriculture and other industries, the use of production frontiers in aquaculture is still very limited. However, in recent years several frontier applications in aquaculture have appeared in the literature, suggesting potential applications of these techniques in aquaculture. A synopsis of stochastic frontier production function model and data envelopment analysis (DEA), the two most popular approaches to efficiency measurement, is presented, followed by a review of recent frontier studies in shrimp, carp and tilapia production. The paper concludes with a brief discussion of future development and prospects of frontier applications for aquaculture management.  相似文献   

Hong Kong SARS sequence     

Leung FC 《Science (New York, N.Y.)》2003,301(5631):309-310

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Apropos telemedicine.          下载免费PDF全文

D Leung 《The Canadian veterinary journal. La revue veterinaire canadienne》1999,40(5):318-320

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Does streptobacillary arthritis reduce house mouse population density,activity and damage to sorghum crops?     

Shahram Kaboodvandpour  Luke K.-P. Leung 《Journal of pest science》2007,80(3):167-174

An experiment to examine the effect of streptobacillary arthritis on mouse populations was conducted in maturing sorghum crops in mouse-proofed pens. There were three treatment pens and three control pens in which mice with and without clinical signs of streptobacillary arthritis were introduced, respectively. A constant mouse density (533 mice ha⁻¹) was introduced to the pens by releasing 12 mice in each pen. The sex ratio of introduced mice was also constant by releasing in each pen nine males and three females. Mean track index was lower in treatment pens than in control pens, indicating that streptobacillary arthritis reduced the activity of mice. However, this was not translated into a reduction in other population responses. Mean mouse density at harvest, percentage of female pregnant at harvest, yield loss caused by mice and a feeding index (oil card index) did not differ significantly between treatment and control groups. A plausible explanation for these findings was that mice with the clinical signs might be less active but were able to consume as much grains as mice without the clinical signs because food was in abundant supply.  相似文献   

开滦范各庄矿“绿色矿山”建设的探索与实践     

黑宇峰  李文刚 《绿色科技》2014,(3):197-198

指出了开滦股份范各庄矿业公司以建设国家级“绿色矿山”为目标,将绿色理念贯穿于矿产开发的全过程,多措并举,积极探索绿色发展模式,使企业走上了安全高效、集约内涵、绿色低碳的新型工业化道路,探讨了绿色矿山“建设的多层管理模式”,为推动其他矿山企业建设“绿色矿山”起到一些带头作用。  相似文献   

Morphological changes in carp epithelial cells infected with Aeromonas hydrophila   总被引：1，自引：0，他引：1  

K Y Leung  T M Lim  T J Lam  Y M Sin 《Journal of fish diseases》1996,19(2):167-174

The in vitro interaction of Aeromonas hydrophila with epithehoma papillosum cells of carp (EPC) was studied. All the virulent and type strains invaded and multiplied inside EPC cells. Morphological changes were induced by the virulent and type strains during the processes of invasion and intracellular replication. Among the virulent group, strain PPD134/91 required the shortest time (30 min post-infection) to induce cytopathic effects in the EPC monolayers. The EPC cells infected with PPD 134/91 became retracted and condensed, lost their attachment abilities, and eventually disintegrated. Confocal microscopy revealed that tubular structures measuring 0.77 ± 0.19 μm appeared to connect the retracted EPC cells. The cytopathic effect was attributed to the growing and metabolically active bacteria. Avirulent strains such as L37 did not multiply nor induce cytopathic effects in the EPC monolayers.  相似文献   

Applications of systems modeling in aquaculture     

PingSun Leung 《Aquacultural Engineering》1986,5(2-4):171-182

This paper deals with the applications of systems modeling in aquaculture. Different types of biological models and techniques of economic analysis such as optimization and simulation are discussed in the context of aquaculture production. Emphasis is on the applicability of such modeling techniques for production system design and operation management. Past modeling efforts for several aquatic species are reviewed and surveyed with a special discussion on an on-going modeling effort of prawn production in Hawaii.  相似文献