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1.
紫花苜蓿可以在我国大部分地区生长,但是由于气候和土壤条件不同,地区间种植技术、收割管理、品种选择、生长季节、灌溉方式、病虫害防治方法等方面存在很大差异。因此,为如此多样化的苜蓿产业制定统一的生产计划非常困难。然而,指导苜蓿生长的重要原则和限制苜蓿产量的因素是相同的,本文就限制苜蓿产量及质量的一些关键限制因素进行了梳理,供业内讨论。 相似文献
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假俭草草坪管理技术研究 总被引：10，自引：0，他引：10
假俭草草坪越来越受人们的喜爱 ,但由于对“低维护”的不正确认识 ,致使草坪的质量差 ,寿命短。本文通过对修剪、施肥、灌溉等基本管理措施和施表土、喷生长调节剂等附加管理措施及对杂草、病虫害的控制进行了描述 ,明确指出对假俭草草坪进行适时、适量的管理是必要的 ,也是必需的 ,以及对假俭草草坪管理中易出现的问题进行了概括与总结 相似文献
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Vertebrate pests and pest control impact on people, animals and the environment, so any ethical consideration of vertebrate pest control must incorporate the interests of all three. The necessity of intervention, whether it involves killing animals or not, must be properly evaluated. Justification for pest control is only tenable if all of the negative impacts (harms) on people, animals and the environment are minimised and all of the positive impacts (benefits) are maximised as far as can be feasibly achieved. In all cases, the most humane control methods possible must be used; we must actively seek ways to improve the humaneness of existing methods and to find new methods that are more humane. There are six major principles that guide the design and execution of ethically sound vertebrate pest control programmes. (1) The aims or benefits and the harms of each control programme must be clear. (2) Control must only be undertaken if the aims can be achieved. (3) The methods that most effectively achieve the aims of the control programme must be used. (4) The methods must be applied in the best possible way. (5) Whether or not each control programme actually achieved its precise aim must be assessed. (6) Once the desired aims or benefits have been achieved, steps must be taken to maintain the beneficial state. An ideal pest control method would be effective and easy to use, affordable, safe for human users and for people exposed to it, humane, specific to the target species or individuals, and safe for the environment. Although such a gold standard is difficult to achieve, we can only retain ethical credibility if we conscientiously strive to make incremental improvements towards that gold standard. 相似文献
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F A Murphy 《The Onderstepoort journal of veterinary research》1985,52(3):195-200
From the time of the first modern studies of infectious diseases, by Koch, Pasteur, Theiler and their colleagues, it has been clear that laboratory investigation must be complemented by epidemiologic investigation. The measurement of all aspects of the natural history of a disease in naturally affected populations is necessary if we are to rationally design control regimens. Building upon a historic perspective, this paper presents a view of the present status of epidemiology as it pertains to animal disease control, and presents a view of the merits of expanding the use of this science in future animal disease control programs, internationally, in developed and developing countries. The basis for this view lies in adaptation of principles employed in human infectious disease epidemiology, and principles which guide the organization of international disease control agencies. 相似文献
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O'brien DJ Schmitt SM Fitzgerald SD Berry DE Hickling GJ 《Veterinary microbiology》2006,112(2-4):313-323
Historical, social and economic factors combined to provide a focus where bovine tuberculosis has become established in free-ranging wildlife in northeastern lower Michigan. White-tailed deer, the primary reservoir and maintenance host of tuberculosis, are highly valued by the public, and particularly hunters, for cultural and economic reasons. Since 1995, significant progress has been made in defining and reducing the reservoir of tuberculosis in deer. As yet, no other wildlife species has been shown to play an epidemiologically important role in the disease cycle. The importance of deer and deer hunting to Michigan has uniquely shaped tuberculosis control policies, and poses ongoing challenges as wildlife managers strive to maintain momentum for broad control strategies, and develop focused strategies that are publicly acceptable. Even if momentum and funding can be maintained, tuberculosis will likely continue to be present for a decade or longer. Thus, cattle producers waiting for tuberculosis to be eradicated from wildlife to eliminate risks to their herds and markets face disappointment for the foreseeable future. Such unrealistic expectations also place Michigan's federal tuberculosis accreditation status at perpetual risk. Accredited free status is unlikely to be regained without accompanying changes in cattle management. In Michigan, management of tuberculosis has clearly demonstrated that social issues and public approval are likely to be the critical limiting factors in control. 相似文献
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Roger A. BALDWIN Terrell P. SALMON Robert H. SCHMIDT Robert M. TIMM 《Integrative zoology》2014,9(3):265-279
Many wildlife species cause extensive damage to a variety of agricultural commodities in California, with estimates of damage in the hundreds of millions annually. Given the limited availability of resources to solve all human–wildlife conflicts, we should focus management efforts on issues that provide the greatest benefit to agricultural commodities in California. This survey provides quantitative data on research needs to better guide future efforts in developing more effective, practical and appropriate methods for managing these species. We found that ground squirrels, pocket gophers, birds, wild pigs, coyotes and voles were the most common agricultural wildlife pest species in California. The damage caused by these species could be quite high, but varied by agricultural commodity. For most species, common forms of damage included loss of crop production and direct death of the plant, although livestock depredation was the greatest concern for coyotes. Control methods used most frequently and those deemed most effective varied by pest species, although greater advancements in control methods were listed as a top research priority for all species. Collectively, the use of toxicants, biocontrol and trapping were the most preferred methods for control, but this varied by species. In general, integrated pest management practices were used to control wildlife pests, with a special preference for those approaches that were efficacious and quick and inexpensive to apply. This information and survey design should be useful in establishing research and management priorities for wildlife pest species in California and other similar regions. 相似文献
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The aim of the study was to assess the role of pest control as a preventive measure in the control of trichinosis. The investigation was designed as a retrospective cohort study in the Virovitica-Podravina County. The incidence of trichinosis was determined according to the presence or absence of exposure to protective pest control measures. Differences in the rate of trichinosis infection were determined by calculating relative risk (RR), i.e., the ratio of absolute risk in the two groups. In this epidemiological study, data collected in the County area regularly covered by pest control (exposure area) were compared with other areas not covered by regular pest control measures (non-exposure area). The study included 132 subjects living in the County and locally infected with trichinosis. Patient data were obtained from their medical history, epidemiological survey and epidemiological questionnaire on the source (autochthony) of the disease. The study also included 133,028 domestic pigs, 875 wild animals (mostly wild boar) and 111 trapped rats. All samples were examined by the method of trichinoscopy at authorized veterinary institutions of the County. Trichinosis infection was recorded in 1012 of 79,534 domestic pigs in the area exposed to pest control measures and in 51 of 53,494 domestic pigs from the rest of the County. RR for the exposure area vs. non-exposure area was 13.35 (95% CI 10.08-17.68; p<0.05); according to particular areas, RR was 3.66 (95% CI 2.62-5.13) for Pitomaca, 22.47 (95% CI 13.27-38.08) for Slatina and 118.89 (95% CI 29.7-476.01) for Orahovica (p<0.05 all). Domestic pigs from the County areas exposed to regular pest control measures had a 13-fold likelihood of infection recorded in pigs from County areas where pest control measures were not or were only occasionally performed. Quite unexpectedly, these results revealed a failure of pest control to reduce the incidence of trichinosis. The spread of trichinosis obviously occurs by some routes obviating the impact of pest control. 相似文献
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Murray M 《Veterinary parasitology》1999,81(2):149-158
I am extremely proud to receive the WAAVP/Pfizer Animal Health award, and particularly so in Africa, the continent where I have spent a large part of my professional life. In the nearly 40 years in research I have had the privilege and excitement of being involved with many great parasites, predators, places and people. In my early days in Kenya I saw all the great wild animal predators, but soon came to appreciate that the greatest predator of all was disease, particularly parasitic disease, with the devastating effects of tsetse and ticks and the infections they transmitted, and of the all-prevailing roundworms. I learned several key lessons while working with research teams to develop better diagnostics, to improve epidemiological understanding as a basis for rational treatment and control, and to extend the understanding of disease processes with the view to developing novel methods of treatment or prevention. The Power of Pathology in diagnosing diseases, identifying new diseases and as a major tool for pathogenic diseases. The Power of Pathogenesis in identifying key mechanisms that led to new diagnostic techniques, improved methods of treatment, and possibly to future vaccines. The Power of Application of what we already know; while recognising that molecular biology will make a massive contribution to improving animal and human health, it is important to appreciate that we already have a very powerful armamentaria to diagnose, treat, control or prevent disease, and when used properly they have been successful and cost-effective. The Power of Genetic Resistance: the recognition that certain species, certain breeds, and certain individuals within breeds possess remarkable resistance to certain parasitic diseases such as trypanosomosis and helminthosis, and that this trait is genetically correlated with production, opens up a very powerful additional approach to improving animal health. The Importance of Measurement: I completely endorse the sentiments of Lord Kelvin, Professor of Natural Philosophy at Glasgow University who stated in 1846: "When you can measure what you are speaking about, and express it in numbers, you know something about it: but when you cannot measure it, your knowledge is of a meagre and unsatisfactory kind." This applies very much to Parasitology. The future is bright. The combination and integration of the new technologies of Biotechnology, Mathematical Methods and Bioinformatics coupled with advances in Computer Power will produce new standards in animal and human health in the 21st century. New methods of predicting, diagnosis, treating, controlling, prognosing and preventing disease will become available. WAAVP has a major role to play by ensuring that veterinary parasitologists are provided with the proper training, infrastructure and forum to advance new technologies and that the veterinary profession plays a leading role in the future direction they take. 相似文献
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Joanna Tunikowska Przemysław Prządka Zdzisław Kiełbowicz 《Reproduction in domestic animals》2020,55(Z2):32-37
Light-based technologies are applied in various fields of medicine: for example optical diagnostics, light-activated therapy and surgery. Although light-based surgical procedures had hardly been a novelty, the revolutionizing moment for surgery came with the first use of light to cut tissue. Nowadays, surgical lasers are routinely used across numerous medical specialties, including gynaecology and urology. They are a part of the surgical treatment of benign prostatic hyperplasia, prostate carcinoma, penis carcinoma, genital skin lesions and orchidectomy. While in human urology lasers continue to establish their position as one of the standard surgical tools, veterinary patients are rarely treated with what here is still considered a technical innovation. However, through research on laser treatment of the prostate hyperplasia conducted on a canine model, veterinary medicine has gained a massive portion of data. It may prove beneficial for our clinical patients. In this review, we introduce the very principles of laser surgery as well as its current and future applications in oncologic surgery of the canine prostate gland and the male reproductive system. 相似文献
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Charles J. KREBS 《Integrative zoology》2015,10(3):233-240
Population ecology is the most mature of the three subdisciplines of ecology partly because it has a solid mathematical foundation and partly because it can address the primary questions of distribution and abundance with experimental protocols. Yet there is much left to do to integrate our population knowledge into community and ecosystem ecology to help address the global issues of food security and the conservation of biodiversity. Many different approaches are now being developed to bring about this integration and much more research will be necessary to decide which if any will be most useful in achieving our goals of explaining the changes we see in the distribution and abundance of animals and plants. Food web ecology would appear to be the best approach at present because it uses the detailed information of the population ecology of particular species in combination with data on consumer–resource interactions to apply to the applied problems of biodiversity conservation, food security, pest management and disease prevention. If we can use our understanding of population ecology to address the practical problems of our time in a creative way, we will benefit both the human population and the Earth's biodiversity. Much remains to be done. 相似文献
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Thomas M Craig 《Veterinary Clinics of North America: Food Animal Practice》2003,19(3):661-78, vi-vii
To control parasitic disease in cattle, one first has to determine what parasites he or she is trying to control--nuisance and biting flies in a milking parlor or ticks on range cattle? The determination may be based on geographic location, class of cattle, and their management. After determining what is there, then if the numbers are sufficient, justify treatment. Each livestock producer has a different array of parasites with which to deal, and in some circumstances, parasitic disease is below the economic threshold. Others may have occasional clinical disease associated with parasites, but most have situations in which the potential of economic loss is high enough to justify control. 相似文献
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为推进嘉宝果产业在广东地区的发展，项目引进嘉宝果在广东中山种植，经过连续期4年对嘉宝果的生物学特性、物候期、果实品质、抗性和耐贮性等的调查研究，以及与前人的研究比较分析，结果表明种子繁殖的嘉宝果树种植7年后可投产，在广东中山一年开花结果3次，平均单果重6.85 g、可溶性固形物含量11.9%、维生素C为22 mg/100g、蛋白质1.24%、脂肪0.1%。果肉口感酸甜，风味较浓，果肉香气浓，果实品质佳。植株抗病性强，对赤霉素和氯吡苯脲敏感。具有良好的经济和应用价值，适合在广东推广种植。并总结出一套栽培技术措施，包括建园及定植、覆膜防草和肥水管理、整形修剪、提高坐果率与果实品质、病虫害防治等。 相似文献
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Management of rangelands, and natural resources in general, has become increasingly complex. There is an atmosphere of increasing expectations for conservation efforts associated with a variety of issues from water quality to endangered species. We argue that many current issues are complex by their nature, which influences how we approach them. We define a complex problem as one that varies in time and space. In other words, one answer may not be correct for all sites or during all years. For simple problems a generalized answer may be sufficient, and even for complex problems, general rules provide a good starting point. However, we suggest that it is important to distinguish between simple and complex problems. Several key obstacles emerge when considering complex natural resource problems, namely, 1) no single entity can handle all aspects of the problem and 2) significant knowledge gaps exist and will continue to exist into the future. We suggest that overcoming these obstacles will benefit from 1) a framework for effective partnerships and 2) a mechanism for continuous learning. Managing complex problems will require some combination of the following: 1) a process-based understanding of the problem (i.e., what causes variation in time and space), 2) adaptive management, and 3) effective coordination of research and management. There are many examples of organizations applying portions of these approaches to complex problems; however, it seems that in many cases the process has simply evolved in that direction rather than being a planned strategy. We suggest that as a profession we need to have a discussion about the nature of the problems we are addressing and how researchers and managers can jointly address these problems. 相似文献
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Basic principles of surgery are important to review, even for experienced surgeons. Although aseptic surgical principles are not always applicable in the field, we have to respect some guidelines. Recent research will influence the way that we do things, based on what we have been taught and our experience. Respecting those simple principles can make a big difference in the final outcome. 相似文献
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近年来杨潜叶跳象对河西走廊地区胡杨(Populus eaphratica)林的危害日益加剧。在金塔县杨潜叶跳象的调查中发现,金塔县气温超过10℃时,杨潜叶跳象出蛰恢复活动,出蛰后立即上树为害胡杨,5月下旬开始化蛹,6月上旬为化蛹盛期。通过喷施5%高效氯氰菊酯乳油1 000倍液,2.5%溴氰菊酯乳油2 000倍液对杨潜叶跳象进行防治,结果表明,4月初在树下喷施1 000倍5%高效氯氰菊酯乳油的胡杨平均好叶率明显高于清水对照胡杨平均好叶率,林内及树下喷施1 000倍5%高效氯氰菊酯乳油,蛹的平均校正死亡率分别为99%、100%,成虫几乎无法完成羽化。 相似文献
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Disease ecology involves a systematic approach to understanding the interactions and evolution of host-pathogen systems at the population level, and is essential for developing a comprehensive understanding of the reasons for disease persistence and the most likely means of control. This systems or ecological approach is being increasingly recognised as a progressive method in disease control and is exploited in diverse fields ranging from obesity management in humans to the prevention of infectious disease in animal populations. In this review we discuss bovine tuberculosis (bTB) in Great Britain (GB) within a disease ecology context, and suggest how a comparative ecological perspective helps to reconcile apparent conflicts with the evidence on the effectiveness of badger culling to assist in the control of bTB in GB and the Republic of Ireland (ROI). Our examination shows that failure of past measures to control bTB and the disparity in outcomes of badger culling experiments are the result of a complex relationship amongst the agent, host and environment, i.e. the episystem, of bTB. Here, we stress the role of distinctive bTB episystems and badger culling trial design in the ambiguity and resulting controversy associated with badger culling in GB and ROI. We argue this episystem perspective on bTB control measures in cattle and badger populations provides a useful and informative perspective on the design and implementation of future bTB management in GB, particularly at a time when both scientific and lay communities are concerned about the ongoing epidemic, the cost of current control measures and the execution of future control procedures. 相似文献