نتایج جستجو برای: animal population
تعداد نتایج: 886109 فیلتر نتایج به سال:
While the mechanistic links between animal movement and population dynamics are ecologically obvious, it is much less clear when knowledge of animal movement is a prerequisite for understanding and predicting population dynamics. GPS and other technologies enable detailed tracking of animal location concurrently with acquisition of landscape data and information on individual physiology. These ...
Abstract We consider the problem of estimating the distribution of carcass weights in a flock of animals from estimates made on a truncated sample. This arises when a farmer chooses the heaviest lambs for slaughter and then measurements are made by the meat processor. This enables a farmer to answer two questions: what proportion of the animals remaining exceed a nominated carcass weight, and/o...
The abundance and activity of ectoparasites and its hosts are affected by various abiotic factors, such as climate and other organisms (predators, pathogens and competitors) presenting thus multiples forms of association (obligate to facultative, permanent to intermittent and superficial to subcutaneous) developed during long co-evolving processes. Ticks are ectoparasites widespread globally an...
The World Veterinary Association, as the global representative of the veterinary profession, recognises the global influences on animal welfare and the changing role of the veterinarian in response to the changing attitudes of the human population. While urban populations are now dictating animal welfare standards, many practices still have a cultural and even religious basis. Veterinarians rec...
Animal and plant population monitoring programs are critical for identifying species at risk, evaluating the effects of management or harvest, and tracking invasive and pest species. Nevertheless, monitoring activities are highly decentralized, which makes it difficult for researchers or conservation planners to get a good general picture of what real-world monitoring programs actually entail. ...
Multilocus enzyme electrophoresis was used to analyze 244 strains of nine Yersinia species isolated from the environment, animals, and humans at 18 genes encoding metabolic enzymes. All 18 enzymes were polymorphic. Among the 137 electrophoretic types (ETs) distinguished, the mean allelic diversity per locus was 0.531. Yersinia frederiksenii ETs were divided into three major clusters that were s...
Background and Objectives: The purpose of this study was to present a summary of the rabies surveillance program in humans in the country, its achievements and its strengths and weaknesses. Methods: This study was a review of the country's plan for surveillance and control of rabies in humans. The sources of information included the data, reports, documents, and published guidelines. The vi...
background: one of the domains of scientific activities is working on animals. performing experiments on animals is permissible only with the purpose of obtaining necessary information for saving and improving life of human beings or animals. principally, all religions believe that human life is more valuable than animal life and humans have a god-given authority over animals, but they shou...
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