Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 72 for “"culling"”.
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Financially Optimal Culling Strategies for Western Canadian Cow-Calf Producers
… to identify financially optimal breeding female culling strategies using production and financial data from 16 ‘typical farms’ in the Canadian Cow-Calf Cost of Production Network (COP Network). Managing the breeding herd inventory composition through culling and replacement decisions impacts the …
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System for Collision Detection Between Deformable Models Built on Axis Aligned Bounding Boxes and GPU Based Culling
… of Graphics Processing Unit (GPU) based culling and Axis Aligned Bounding Box (AABB) based culling. Techniques for performing hierarchy-less GPU-based culling are given. We then discuss how and when to switch between GPU-based culling and AABB based techniques.
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Mathematical modeling of foot and mouth disease (FMD) in Cattle and Buffaloes using vaccination and culling: A Namibia perspective
… dynamics of FMD with and without vaccination and culling as control measures replicating the FMD infection in the interface setting of Namibia communal areas and National parks. Furthermore, we fit the model with control measures to the yearly cumulative FMD cases in Namibia and discuss the …
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Caracterização dos motivos de descarte e estimativas de parâmetros genéticos para longevidade de vacas da raça holandês
… animal welfare, making it essential to identify culling reasons and estimate related genetic parameters. Analyzing culling reasons can improve management and selection in dairy cattle breeding programs. This study evaluated 34 culling reasons in Holstein dairy herds. Data from 3,096,872 Holstein …
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Performance Improvements for the Rasterization Pipeline
… The final area we focus on is programmable culling. Culling is an old concept in computer graphics, and it is often necessary to include some form of culling to make an algorithm truly efficient. However, current graphics hardware only has a few fixed function culling algorithms implemented. …
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Microcomputer simulation of management practices affecting timing of net income in dairy cattle
… of all combinations of two levels of involuntary culling, heifer rearing, and sire selection against dystocia in heifers on timing and magnitude of net income in dairy cattle. Time to cumulative payoff of expenses and net income per day of herdlife were measured for herds and individual cows. Net …
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Interactions of the South African fur seal and fisheries in the Benguela ecosystem
… this factor is very variable and under different culling regimes is usually greater than 4; that historically, the mean population : pup ratio is 4.55. The most effective means of reducing the population is to cull both pups and bulls (the population decrease resulting mainly from reduced pup …
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Human and nature at conflict: a case study of Mauritius flying fox, Pteropus niger
… of Mauritius, has been subjected to several culling initiatives since 2015. Government of the Republic of Mauritius, reacting to pressures from fruit producers opted for culling while conservationists argue that non-lethal strategies be adopted to deal with fruit damage caused by the fruit …
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Causes and Implications of Fox Population Dynamics in Central Southern England
… compensatory immigration. Therefore, given that culling is not a long-term solution, identifying the underlying causes of such high fox immigration pressure is needed to provide support for alternative, more sustainable means of controlling foxes. In this thesis, I investigated the population …
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An economic analysis of commercial egg production
… types of birds under various frequencies of culling had different functions. However, the relationship a type of bird had to other types was not consistent when different frequencies of culling were compared. The labor to perform specific chorea was estimated using time per 100 birds as a …
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Understanding the epidemiology of bovine TB and potential routes of infection by elucidation of fine-scale badger behaviour and movement
… commercial earnings within the U.K. and Ireland. Culling of badgers has been suggested as a potentially useful protocol to reduce the incidence of bTB in badgers and thus cattle; however, the practice is controversial and has not consistently resulted in reduced disease prevalence in areas of high …
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An economic evaluation of the optimal ewe replacement policy for typical Canterbury light land and irrigated properties
… state of its incisor teeth. The basis for this culling policy is that ewes with worn or missing teeth are considered unable to graze and therefore to produce satisfactorily. The study takes the following form; (1) review of the relevant literature, (2) survey of farmers running 'gummy' ewes, (3) …
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Prevention of bovine mastitis
… through loss of milk, use of antibiotics and culling of infected animals. A great deal is known about the organisms responsible for inflammatory reaction of the glandular tissue, but no completely satisfactory method for preventing invasion has yet been found, nor has the use of Streptococcal …
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Fast and accurate visibility preprocessing
… of approximate solution, known as conservative culling. Such algorithms over-estimate the set of visible polygons. This compromise has been considered necessary in order to perform visibility preprocessing quickly. These algorithms attempt to satisfy the goals of both rapid preprocessing and …
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Managing deer: attractants, repellents, invasion modelling and impact assessment
… of several animal and human diseases. Culling of growing populations is viewed as a necessity in order to protect human and ecological interests, but such deer management may be aided by the development and use of additional approaches, including attractants and repellents. These remain …
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The Virginia Beef Cattle Simulation Model: A bio-economic simulation program modeling the interactions among reproduction, forage availability, nutrition, growth, and marketing in beef cattle
… dystocia, lactation, pregnancy testing, culling, within-herd replacement female selection, open or pregnant replacement female purchases, cow and calf mortality, and weaning. The forage module simulates daily pasture growth dependent upon month, precipitation, erosion, pasture …
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Quantifying and integrating constructability into multi-objective steel floor framing design
… availability, structural steel floor framing, culling, multi-objective design
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Matrix Gene Splicing and Emergence of Highly Pathogenic Avian Influenza
… outbreaks occurred in 1983-1984 and resulted in culling of almost 17 million chickens, turkeys, and guinea fowl. We demonstrated that the 1980s Pennsylvania linage was unique regarding their M gene splicing. These viruses were capable of producing messenger RNA 4 (mRNA4), which had direct …
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