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Tesis sobre el tema "Veterinary and Environmental Sciences"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 20 de febrero de 2023

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1

ElSayed, Eman. "Fate and transport of agricultural herbicides and veterinary antibiotics in the presence of a non ionic surfactant." Thesis, McGill University, 2013. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=119479.

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Many parts of the world, and especially developing countries, are experiencing severe water shortage problems. This is causing increased use of untreated or partially-treated wastewater for irrigation. Consequently, many pollutants such as surfactants, present in wastewaters, could influence fate and transport of agricultural chemicals in soils. Therefore, a field lysimeter study was undertaken to investigate the effect of non-ionic surfactant, Brij 35, on the fate and transport of two commonly used antibiotics, oxytetracycline (OTC) and monensin (MON), and an herbicide, metribuzin. Twenty se

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2

Hooper, Paul Nicholas. "The resistance of liquid extended boar semen to environmental stress encountered during air transport." Thesis, University of Reading, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.333488.

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3

Kongara, Kavitha. "Studies on renal safety and preventive analgesic efficacy of tramadol and parecoxib in dogs : thesis in fulfilment of the degree of Doctor of Philosophy in Veterinary Clinical Science, Institute of Veterinary Animal and Biomedical Sciences, College of Sciences, Massey University, Palmerston North, New Zealand." Massey University, 2008. http://hdl.handle.net/10179/864.

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Ovariohysterectomy and castration are common surgical procedures in small animal practice that can result in clinically significant postoperative pain. One way of controlling postoperative pain is administration of a single analgesic or a combination of different classes of analgesics prior to the onset of noxious stimuli. A constraint to the perioperative use of traditional opioids and non-steroidal anti-inflammatory drugs (NSAIDs) is their undesirable side effects. In this series of experiments, the preventive (pre-emptive) analgesic efficacy of two popular human analgesics, tramadol (an ?at

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4

Swan, Kathie Lanette. "Sorption Characteristics of Veterinary Ionophore Antibiotics Monensin and Lasalocid and Soil Clay Constituents Kaolinite, Illite and Montmorillonite." University of Toledo / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1344958732.

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5

Turner, Susan Jane. "Microbiological Indicators of Faecal Contamination in Aquatic Environments." Thesis, University of Auckland, 1996. http://hdl.handle.net/2292/2375.

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1. The aim of this research was to determine appropriate microbial indicator systems for use in monitoring the occurrence and source of faecal contamination in aquatic environments. Particular emphasis has been placed on the identification of indicators which might enable faecal contamination of human origin to be distinguished from that of non-human derivation. Two lines of investigation have been pursued; the use of alternative microbial indicator systems for water quality monitoring, and the development of diagnostic molecular methods for identifying the origin of faecal organisms. 2. Field

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6

Stanley, Karen Nicola. "Seasonal varation of the thermophilic campylobacters in farm animals and the farm environment." Thesis, Lancaster University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.337461.

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7

Erceg, Vicki Heather. "Detection of behavioural and cognitive dysfunction in mucopolysaccharidosis IIIA affected dogs : a thesis presented in partial fulfilment of the requirements for the degree of Master of Veterinary Science at Massey University, Palmerston North, New Zealand." Massey University, 2009. http://hdl.handle.net/10179/1053.

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This study investigated whether behavioural and cognitive dysfunction caused by mucopolysaccharidosis (MPS) IIIA can be detected early in affected dogs’ lives, and to describe the behaviours of these dogs. No other scientific papers have been published on this topic and the population of dogs examined in this study are the only MPS IIIA affected dog colony available worldwide for study. Three main tests were performed on the population of MPS IIIA affected dogs. Physical behavioural assessment tests were performed at six and eight weeks of age and from twenty weeks of age a cognitive function

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8

Sheldon-Sayer, Lynne. "The vegetation of Maud Island, Marlborough, New Zealand." Lincoln University, 2006. http://hdl.handle.net/10182/1707.

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Maud Island (Te Hoiere - "a long paddle or mighty pull") is a moderately sized island of 309 hectares, located in the Pelorus Sound (41°, 02 'S, 173° 54 'E) Marlborough, at the north-east end of the South Island of New Zealand. It has a long history of human modification and impacts since its colonisation by Maori and early Europeans. The vegetation of Maud Island has been studied in the 1980's and again in the early 1990's. The objectives of this study were to (1) describe how the vascular plant communities vary in species composition across Maud Island, (2) determine which environmental fact

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9

Puig, Virginia Moreno. "Conservation issues for Hochstetter's frog (Leiopelma hochstetteri): monitoring techniques and chytridiomycosis prevalence in the Auckland region, New Zealand : a thesis presented in partial fulfillment of the requirements for the degree of Master of Science in Conservation Biology at Massey University, Auckland, New Zealand." Massey University, 2009. http://hdl.handle.net/10179/1132.

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Amphibians are suffering extinctions and range contractions globally. This is caused by numerous factors and most of them are related to human activities. The overall aim of this thesis was to make a significant contribution to the conservation of the endemic amphibian Leiopelma hochstetteri through research. This was achieved by focusing in two of the main conservation issues for this species, the need for standardised and robust monitoring techniques to detect trends and changes in populations, and the determination of the prevalence of chytridiomycosis, caused by the amphibian chytrid fungu

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10

Bates, Andrew John. "Effects of grazing management and pasture composition on the nitrogen dynamics of a dairy farm : a simulation analysis : a thesis submitted in partial fulfilment of the requirements for the degree of Doctor of Philosophy at Lincoln University /." Diss., Lincoln University, 2009. http://hdl.handle.net/10182/1360.

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There is an extensive debate on the potential environmental impact of dairy farms and in particular the effect of dairy farms on the nitrogen cycle and the effect that this has on ecosystems. Within New Zealand and in particular in the South Island, the expansion of dairying and the adoption of new dairy systems has led to this becoming an increasingly important issue, locally through its effect on water quality and the environment and nationally and internationally through the production of green house gases. Increases in nitrogen usage at the expense of clover nitrogen fixation, irrigation,

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11

Lopez, Juan Carlos. "The effect of environmental stressors on the immune response to avian infectious bronchitis virus." Lincoln University, 2006. http://hdl.handle.net/10182/643.

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The first aim of this research was to determine the prevalence of IBV in broilers within the Canterbury province, New Zealand, in late winter and to search for associations with management or environmental factors. The second aim was to study how ambient stressors affect the immune system in birds, their adaptive capacity to respond, and the price that they have to pay in order to return to homeostasis. In a case control study, binary logistic regression analyses were used to seek associations between the presence of IBV in broilers and various risk factors that had been linked in other studie

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12

Fisher, P. M. "Residual concentrations and persistence of the anticoagulant rodenticides brodifacoum and diphacinone in fauna." Lincoln University, 2009. http://hdl.handle.net/10182/930.

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Brodifacoum is a highly effective anticoagulant rodenticide that presents a secondary hazard to some non-target wildlife. The high acute toxicity of brodifacoum to mammals and birds, and its prolonged persistence in liver predicates secondary risk to predators and scavengers of poisoned rodents. Hence there is a need to improve ability to monitor and predict hazards of brodifacoum to non-targets, and optimise use patterns accordingly. Use of a less persistent anticoagulant rodenticide, diphacinone, is an alternative approach currently under investigation in New Zealand. This thesis describes a

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13

Calder, Keith Wallace. "A LEEP forward : biodiversity futures for New Zealand : a thesis in partial fulfilment of the requirements for the Master of Resource and Environmental Planning at Massey University, Palmerston North, New Zealand." Massey University, 2007. http://hdl.handle.net/10179/741.

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Loss of indigenous biodiversity continues in New Zealand. Despite admirable goals in the NZBS 2000 to the contrary, efforts at improved biodiversity conservation have been insufficient to halt loss of significant amounts of indigenous forest and wildlife habitat. Increasing numbers of native species are moving towards critically endangered and extinction. Whatever we are doing in New Zealand, it is not effective enough. The aim of this study is to firstly identify factors contributing to the failure, “to halt the decline of indigenous biodiversity” in New Zealand and to then consider opportuni

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14

Willems, Nancy. "Forest structure and regeneration dynamics of podocarp/hardwood forest fragments, Banks Peninsula, New Zealand." Lincoln University, 1999. http://hdl.handle.net/10182/1301.

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Although species maintenance in small forest fragments relies on successful regeneration and recruitment, few studies have examined the effects of fragmentation on regeneration processes. New Zealand's podocarp species rely on large disturbance openings operating across a vegetated landscape to stimulate regeneration. Clearance of vegetation that results in small fragments of forest removes regeneration opportunities for podocarps by destroying the intact vegetation mosaic, and as a result may exclude disturbances of the scale necessary for podocarp regeneration. Fragmentation alters the distu

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15

Dittmer, Keren Elizabeth. "Inherited rickets in Corriedale sheep : a thesis presented in partial fulfilment of the requirements for the degree of Doctor of Philosophy at Massey University, Palmerston North, New Zealand." Massey University, 2008. http://hdl.handle.net/10179/882.

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Inherited rickets of Corriedale sheep is a newly discovered skeletal disease of sheep with simple autosomal recessive inheritance. The clinical signs resemble rickets in other species and include decreased growth rate, thoracic lordosis and angular limb deformities. Radiographic features include physeal thickening, blurred metaphyseal trabeculae and thickened porous cortices. Computed tomography scanning of long bones reveals increased bone mineral content and cortical area, but decreased bone mineral density. Gross lesions include segmental thickening of physes, growth arrest lines, collapse

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16

Stella, Judith Lynn. "An Investigation of Environmental Factors that Affect the Behavior and Welfare of Domestic Cats (Felis sylvestris catus)." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1364486788.

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17

O'Connor, Katrina Marie. "The ecological footprint of international tourists in New Zealand : a thesis presented in partial fulfilment for the degree of Master of Applied Science in Natural Resource Management at Massey University, Palmerston North, New Zealand." Massey University, 2009. http://hdl.handle.net/10179/1124.

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Ecological Footprint Analysis (EFA) is a technique that was first developed by Wackernagel as a Ph.D. thesis in 1994, then further developed in combination with Rees and published (Rees & Wackernagel, 1995). EFA is employed in this study to assess the resource utilisation of international tourists visiting New Zealand. Tourism is one of the fastest growing industries in the world and the ecological sustainability of tourism is becoming more important term for managing tourism. This is becoming increasingly important with tourism identified as particularly as a significant contributor to carbon

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18

Ford, Colleen D. "The fate of nitrogen in lactose-depleted dairy factory effluent irrigated onto land." Lincoln University, 2008. http://hdl.handle.net/10182/837.

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A two-year lysimeter study was undertaken to compare the environmental effects (e.g. nitrate leaching and nitrous oxide emissions) of soil applied lactose-depleted dairy factory effluent (LD-DFE) with lactose-rich DFE. The aim of this experiment was to determine the fate of nitrogen from LD-DFE and dairy cow urine applied to a Templeton fine sandy loam soil (Udic Ustrochrept), supporting a herbage cover of ryegrass (Lolium perenne) and white clover (Trifolium repens). Measurements were carried out on the amount of nitrogen lost from the soil via leaching, lost by denitrification, removed by th

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19

Hill, Andrew Gordon. "An investigation of Leucocytozoon in the endangered yellow-eyed penguin (Megadyptes antipodes) : a thesis presented in partial fulfilment of the requirements for the degree of Master of Veterinary Science at Massey University, Turitea, Palmerston North, New Zealand." Massey University, 2008. http://hdl.handle.net/10179/1063.

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Yellow-eyed penguins have suffered major population declines and periodic mass mortality without an established cause. On Stewart Island a high incidence of regional chick mortality was associated with infection by a novel Leucocytozoon sp. The prevalence, structure and molecular characteristics of this leucocytozoon sp. were examined in the 2006-07 breeding season. In 2006-07, 100% of chicks (n=32) on the Anglem coast of Stewart Island died prior to fledging. Neonates showed poor growth and died acutely at approximately 10 days old. Clinical signs in older chicks up to 108 days included anaem

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20

Donaldson, Laura Patricia Constance. "The distribution of fatty acids and presence of environmental contaminants in the blubber of the New Zealand sea lion (Phocarctos hookeri) : a thesis presented in partial fulfilment of the requirements for the degree of Master of Science in Conservation Biology at Massey University, Palmerston North, New Zealand." Massey University, 2008. http://hdl.handle.net/10179/887.

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The conservation of marine mammals relies on the knowledge of species ecology in order to assess the impacts of anthropogenic activites and make appropriate species management decisions. Blubber biopsies are a relatively non-invasive sampling protocol to provide ecological information; two particular uses are for dietary analysis via fatty acid signature analysis (FASA) and investigating the uptake of organochlorine (OC) and polychlorinated biphenyl (PCB) environmental contaminants. Blubber composition and structure may vary according to body site and depth due to its dynamic functioning. This

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21

Newcombe, Vernon Claude. "Mercury use in the goldmining industry : a retrospective examination of elemental mercury use in the gold mining industry of the West Coast of New Zealand in the period 1984-1988 : a thesis submitted in partial fulfilment of the requirement for the degree of Master of Philosophy (Science) at Massey University, Wellington, New Zealand." Massey University, 2008. http://hdl.handle.net/10179/832.

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22

Chappell, Esta Monique. "Morphology, phylogeography and drumming behaviour of a New Zealand ground weta, Hemiandrus pallitarsis : a thesis presented in partial fulfillment of the requirements for the degree of Master of Science in Conservation Biology at Massey University, Palmerston North, New Zealand." Massey University, 2008. http://hdl.handle.net/10179/828.

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Species are one of the fundamental components of biology and the accurate delimitation of species is important in evolutionary, systematic and ecological studies, yet there is still confusion over how species can be recognised. Examining different characters allows multiple lines of evidence for successful and accurate species delimitation and identification. In this thesis, morphological, genetic and behavioural variation is investigated within an endemic species of ground weta, Hemiandrus pallitarsis, in the North Island, New Zealand. Twelve morphological characters were measured, and mitoch

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23

Chakraborty, Manas. "Spatial pattern in macroinvertebrate communities in headwater streams of New Zealand and a multivariate river classification system : a thesis presented in partial fulfilment of the requirements for the degree of Master of Science in Ecology at Massey University, Palmerston North, New Zealand." Massey University, 2008. http://hdl.handle.net/10179/1067.

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Macroinvertebrate data collected from 120 headwater streams in New Zealand were used to test the ability of the Freshwater Environments of New Zealand River Classification (FWENZ) to explain spatial variation in unimpacted stream invertebrate communities. FWENZ is a GIS based multivariate river environment classification of the sections of national river network. The classification performance of the FWENZ was examined to determine the optimum classification level which could be used for the purpose of conservation and biomonitoring of New Zealand rivers and streams. The classification perform

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24

Jimenez-Castro, Claudia. "Management of a marine protected area by a local NGO in Honduras: its implications for local communities." Lincoln University, 2008. http://hdl.handle.net/10182/1237.

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This study explores the factors that influence the management of a protected area situated on private land as well as the implications of these factors in the interaction between the NGO and the communities associated with this area. The protected area, Marine National Monument Cayos Cochinos, is an archipelago surrounded by reefs in the Honduran Caribbean. This area is home to a highly heterogeneous population of fisherfolk communities –most are members of the Garifuna ethnic group– and wealthy Honduran and foreign landowners. This case study also comprises three fisherfolk communities outsid

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25

Mojsilovic, Ognjen. "Estimating bioaccessibility, phytoavailability and phytotoxicity of contaminant arsenic in soils at former sheep dip sites." Lincoln University, 2009. http://hdl.handle.net/10182/1142.

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Recognition that the bioavailability of soil As (As) is influenced by its soil dynamics has initiated research into development of more accurate, site-specific soil guideline values, departing from the assumption that the total soil As content is bioavailable. With the aim of deriving predictive models, the relationship between soil properties and As bioavailability (bioaccessibility and phytotoxicity) was examined on a set of naturally contaminated sheep dip soils (n = 30). Sampled soils were extensively characterised, bioaccessibility was estimated through an in vitro procedure, and soil As

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26

Robertson, Louise Mary. "Anthelmintic treatment and digestive organ morphology of captive-reared kaki (Himantopus novaezelandiae) released to the wild : a thesis presented in partial fulfilment of the requirements for the degree of Master of Science in Conservation Biology at Massey University, Palmerston North, New Zealand." Massey University, 2009. http://hdl.handle.net/10179/1001.

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The continued existence of New Zealand’s critically endangered and endemic black stilt or kakï (Himantopus novaezelandiae) relies on an intensive captive management programme. While this is successful at rearing large numbers of birds for release to the wild, poor survivability of these birds is limiting significant increases in the wild population. Predation and starvation are suspected to be the most common causes of death in released birds, but underlying contributing factors to these mortalities have not been fully evaluated. This research investigates the possible contribution of gastroin

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27

Muir, Paul David. "Studies on the growth and compositional development of antlers in red deer (Cervus elaphus)." Lincoln College, University of Canterbury, 1985. http://hdl.handle.net/10182/1178.

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The experiments described in this thesis investigated nutritional and physiological aspects of antler growth in red deer stags. The initial experiment (Section 3) examined the effects of winter nutrition on subsequent antler casting date and velvet antler weight. Mature stags on two different farm types (hill country, Farm H and irrigated lowland, Farm L) were offered three levels of winter nutrition, two levels of a concentrate supplement (ad libitum pellets and 1/2 ad libitum pellets) and a basal hay ration. On both properties liveweight gains occurred in supplemented groups and liveweight l

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28

Hedley, Carolyn B. "The development of proximal sensing methods for soil mapping and monitoring, and their application to precision irrigation : a thesis presented in partial fulfilment of the requirements for the degree of Doctor of Philosophy in Soil Science at Massey University, Palmerston North, New Zealand." Massey University, 2009. http://hdl.handle.net/10179/1217.

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The potential of proximal soil sensing methods for high resolution investigation of soils in the landscape has been investigated. This addresses the need for improved environmental monitoring and management of soils within their environs. On-the-go electromagnetic (EM) mapping has been used to map soils, providing a high resolution (< 10m) spatially defined soil apparent electrical conductivity (ECa) datalayer. Vis-NIR field spectroscopy has been trialled for in situ analysis of soil carbon, nitrogen and moisture. The portable spectroradiometer has been used at 6 sites in the Taupo-Rotorua reg

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29

Robertson, M. S. T. "Riparian management guides : are they meeting the needs of the interested public?" Diss., Lincoln University, 2008. http://hdl.handle.net/10182/601.

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In New Zealand, there are many published guidelines about the management of riparian areas. The question needs to be asked, are these guides useful? This research thesis investigates the extent to which riparian management guides meet the needs of the users. This research also considers the importance of riparian management (with regards to the appropriateness of educational guides) in assisting practitioners and the interested public in the management of riparian areas. The main way of investigating this topic was with the help of discussion groups. Discussion groups were held with intereste

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30

Black, Amanda. "Bioavailability of cadmium, copper, nickel and zinc in soils treated with biosolids and metal salts." Lincoln University, 2010. http://hdl.handle.net/10182/1561.

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It is widely accepted that bioavailability, rather than total soil concentration, is preferred when assessing the risk associated with metal contamination. Despite this, debate continues on what constitutes a bioavailable pool and how to best predict bioavailability, especially in relation to crop plants. The overall aim of this thesis was to assess and validate measures of cadmium (Cd), copper (Cu), nickel (Ni) and zinc (Zn) bioavailability in a range of soils amended with metal salts and biosolids. Six potential measures of bioavailability were investigated and compared: total metal; 0.04 M

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31

Thomas, Craig W. "Current practices and future possibilities of performance recording extensively-grazed commercial beef herds in New Zealand." Diss., Lincoln University, 2008. http://hdl.handle.net/10182/844.

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There is little evidence that the productivity of New Zealand beef herds has improved over time. Data from the NZ Meat and Wool Board’s Economic Service (2006) suggest that the average national calving percentage has declined over the last two decades. During the same period cattle carcass weights have increased but so too has the average cow live-weight which has resulted in increased maintenance costs of the cow herds. It is unclear whether production efficiency in the industry has improved or declined over time. The aim of this research was to develop means of improving productivity in

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32

Whitwell, Sarah Margaret. "The impact of isolation from mammalian predators on the anti-predator behaviours of the North Island robin (Petroica longipes) : a thesis presented in partial fulfilment of the requirements for the degree of Master of Science in Conservation Biology at Massey University, Auckland, New Zealand." Massey University, 2009. http://hdl.handle.net/10179/1142.

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Conservation in New Zealand has begun to focus heavily on the restoration of degraded mainland ecosystems and the reintroduction of native species that have become locally extinct. In many cases the individuals that are selected for reintroduction are harvested from ‘mammal-free’ offshore islands. This thesis examines the effects of isolation from mammalian predators on the predator avoidance behaviours and predator recognition abilities of New Zealand birds using the North Island robin as a model. It also investigates whether any effects of isolation from mammalian predators has a lasting imp

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33

Gibson, Troy John. "Electroencephalographic responses of calves to the noxious sensory input of slaughter by ventral neck incision and its modulation with non-penetrative captive bolt stunning : a thesis presented in partial fulfilment of the requirements of the degree of Doctor of Philosophy in Physiology, Massey University, Palmerston North, New Zealand." Massey University, 2009. http://hdl.handle.net/10179/1010.

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Slaughter by ventral neck incision (VNI) is performed on some animals without prior stunning in New Zealand and other countries. A single incision with a razor sharp blade is made in the ventral aspect of the neck, sectioning both carotid arteries and jugular veins, though, not the vertebral arteries. There are a number of potential welfare concerns surrounding slaughter by VNI including pain due to the incision, which may lead to distress during the time before loss of consciousness. The aims of this thesis were to identify cortical responses indicative of noxious stimulation due to slaughter

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34

Wilkinson, Roger Lindsay. "Population dynamics and succession strategies of rural industry producers." full-text, 2009. http://eprints.vu.edu.au/1943/1/Roger_Wilkinson_PhD_thesis.pdf.

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Sheep farming in Australia has a long tradition, built up over several generations, of inheritance of the family farm, the occupation of sheep farming and the personal identity around being a sheep farmer. This tradition appears to be under threat, due to a combination of hard times and the long-term and inexorable decline in the terms of trade. I examined this threat to the continuation of family farming in Australia’s sheep industry by describing the demographic structure of the industry, documenting the structural changes and questioning whether the changes actually matter. The work involve

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35

Justice-Allen, Anne E. "Survival of Mycoplasma Species in Recycled Bedding Sand and Possible Implications for Disease Transmission to Ruminants." DigitalCommons@USU, 2010. https://digitalcommons.usu.edu/etd/730.

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Mycoplasmas are a group of bacteria which are small in size, lack a cell wall, and have small genomes in comparison to other bacteria. The members of the group that are pathogenic utilize several mechanisms to evade the host's immune system. These processes affect surveillance and control mechanisms such as serologic testing and vaccination. Many of these organisms cause diseases of livestock, which heavily impact production parameters such as weight gain, milk yield, and egg production. Mycoplasmas also cause disease in people. Mycoplasma spp. can cause mastitis, metritis, pneumonia, and

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36

Page, Girija. "An environmentally-based systems approach to sustainability analyses of organic fruit production systems in New Zealand : a thesis presented in partial fulfilment of the requirements for the degree of Doctor of Philosophy in Sustainable Agricultural Systems at Massey University, Palmerston North, New Zealand." Massey University, 2009. http://hdl.handle.net/10179/825.

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An environmentally-based systems approach to sustainability analyses of organic fruit production systems in New Zealand. This research introduces an approach for the assessment of the sustainability of farming systems. It is based on the premises that sustainability has an environmental bottom line and that there is very limited substitutability between natural capital and other forms of capital. Sustainability assessment is undertaken through analyses of energy and material flows of the system and their impacts on the environment. The proposed sustainability assessment approach is based on tw

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37

Di, Hong J. "Application of isotopic dilution methods to the study of the dissolution of phosphate fertilisers of differing solubility in the soil." Lincoln University, 1991. http://hdl.handle.net/10182/1792.

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An injection technique, in which undisturbed soil cores are labelled with ³²P to study dissolution of phosphate fertilisers in the soil, was evaluated in field and glasshouse trials. When ³²P was injected between 0-150 mm depths of the undisturbed soil columns and fertilisers applied at the surface, the amounts of fertiliser P dissolved, as measured by the increases in the exchangeable P pools, were overestimated. Three possible reasons were suggested: (i) the interaction between surface-applied fertiliser, ³²P injected through the whole soil column, and the vertical decline in root density, (

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38

Dobson-Hill, Brenna Catherine. "Uterine involution in the dairy cow : comparative study between organic and conventional dairy cows : a thesis presented in partial fulfilment of the requirements for degree of Masters of Science in Animal Science, Massey University, Palmerston North." Massey University, 2009. http://hdl.handle.net/10179/1272.

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Organic dairying is growing in popularity in New Zealand and the demand for knowledge is ever increasing. Many more farmers are considering organics as an alternative to their current conventional system. However, limited information is available on organic dairying in a New Zealand pastoral situation particularly in relation to its effect on fertility. The New Zealand dairy industry requires the dairy cow to become pregnant every year at the same time to maximise milk production and utilise the high pasture production in spring. A cow requires 40 to 60 days for uterine involution to occur and

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39

Muswema, Aubrey Patrick. "An audit of veterinary waste management in Durban." Thesis, 2003. http://hdl.handle.net/10413/4163.

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Since 1994, there have been sweeping changes made to South African policy and legislation, including environmental rights for all people, environmental protection and the consideration of sustainability in all activities. A national policy for medical waste management is being developed and guidelines for the South African Veterinary Council are currently being revised. By auditing contemporary veterinary waste management in one of South Africa's largest cities, this study sought to provide appropriate input into these initiatives. As a study area, the Durban Unicity provided the opportunity t

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40

Peixoto, Patricia Lisandri de Souza. "Micro and Nano-flow approaches for monitoring the fate and environmental impacts of veterinary antibiotics." Doctoral thesis, 2017. https://hdl.handle.net/10216/109990.

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Peixoto, Patricia Lisandri de Souza. "Micro and Nano-flow approaches for monitoring the fate and environmental impacts of veterinary antibiotics." Tese, 2017. https://hdl.handle.net/10216/109990.

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Park, Buem-Seek. "Responses of an Environmental Gram-negative Bacterium to Pollutant Stress." 2002. http://eprints.vu.edu.au/226/1/02whole.pdf.

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Several strains of pseudomonads which are normally found in natural water and soil environments, including Pseudomonas fluorescens, Pseudomonas aeruginosa, and strains initially identified as Pseudomonas paucimobilis and Pseudomonas maltophilia, were used in this thesis and their stress responsive proteins were surveyed at the physiological level. Additionally, 16S rRNA gene comparison was employed to classify the pseudomonads and related species at the genetic level. In order to see to what extent the pseudomonads and related species responded to heat shock, cells were initially subjected to

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Alistair, Phillips. "A method for replacing serrated tussock (Nassella trichotoma) with kangaroo grass (Themeda triandra) in lowland native grassland remnants." 1999. http://eprints.vu.edu.au/218/1/Alistair%2C_Phillips.pdf.

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A 'spray and hay' method was developed which replaces the noxious weed serrated tussock (Nassella trichotoma (Nees) Arech.) with indigenous kangaroo grass (Themeda triandra Forrsk.) in partly disturbed remnants of western (basalt) plains indigenous grassland, a community listed as vulnerable to extinction. Investigations were carried out on Melbourne's north-west urban fringe. Refinements of the 'spray and hay' method resulted in low densities of other weeds amongst the newly established T. triandra swards. First steps in the method involved removal of weeds by slashing and follow-up treatment

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Candy, SG. "Predictive models for integrated pest management of the leaf beetle Chrysophtharta bimaculata in Eucalyptus nitens plantations in Tasmania." 2000. http://eprints.utas.edu.au/224.

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The Tasmanian Eucalyptus leaf beetle, Chrysophtharta bimaculata (Coleoptera: Chrysomelidae) is the most important phytophagous insect pest of eucalypts in Tasmania regularly defoliating new season’s growth over large areas of forest. An integrated pest management (IPM) system is currently in operation to minimise economic losses from defoliation of Eucalyptus nitens plantations due to browsing by larvae. However, the utility of the IPM system has been limited by the lack of : (a) an efficient sampling scheme for population monitoring, (b) the ability to predict an ‘action threshold’ (i.e. the

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Gillies, Craig. "Aspects of the ecology and management of small mammalian predators in northern New Zealand." 1998. http://hdl.handle.net/2292/1942.

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Each chapter in this thesis has been written as a separate paper intended for later publication. Rather than write one summary, an abstract for each chapter has been given in the order they are presented in the thesis. Chapter I. The prey species of domestic cats (Felis catus) in two suburbs of Auckland city, New Zealand. The prey brought in by 80 cats (Felis catus), over a year was monitored in two suburbs of Auckland New Zealand. The survey technique followed that of Churcher & Lawton (1987) where cat owners were asked to record (and if possible keep) the prey their cats brought in. The resu

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Ito, Masayoshi 1967. "Non-filterable metals (NFM) in the atmosphere." 2003. http://hdl.handle.net/2292/1954.

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A new air sampler, the Mist-UV sampling system, has been developed to trap and detect metals and metal compounds present in atmospheric samples, as non-filterable metal (NFM). The Mist-UV system is based on the combination of two ideas, mixing the filtrated air sample with nitric acid mist and simultaneous ultraviolet irradiation of the mist. Atmospheric NFM in the introduced air samples, which were first passed through a 0.2 µm filter, were oxidised by UV irradiation and dissolved in the nitric acid mist. The trapped metals resulting from the NFM in nitric acid were quantitatively determined

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Adeeb, Farah. "A Study of near-surface ozone concentrations in the city of Auckland, New Zealand." 2006. http://hdl.handle.net/2292/2571.

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Whole document restricted, see Access Instructions file below for details of how to access the print copy.<br>This research provides insight into large-scale spatial variation of ozone (O3) distribution in the Auckland region and was designed to increase our understanding of O3 behaviour and distribution in a coastal-urban situation. The research was also carried out with a view to assisting regulatory agencies optimize future monitoring networks, and to help identify locations where human health and natural resources could be at risk in the future. Although the research was limited to one reg

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Park, Buem-Seek. "Responses of an Environmental Gram-negative Bacterium to Pollutant Stress." Thesis, 2002. https://vuir.vu.edu.au/226/.

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Several strains of pseudomonads which are normally found in natural water and soil environments, including Pseudomonas fluorescens, Pseudomonas aeruginosa, and strains initially identified as Pseudomonas paucimobilis and Pseudomonas maltophilia, were used in this thesis and their stress responsive proteins were surveyed at the physiological level. Additionally, 16S rRNA gene comparison was employed to classify the pseudomonads and related species at the genetic level. In order to see to what extent the pseudomonads and related species responded to heat shock, cells were initially subjected to

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Lizarraga-Madrigal, Ignacio. "Spinal analgesic interaction between non-steroidal anti-inflammatory drugs and N-methyl-D-aspartate receptor systems : a thesis presented in partial fulfilment of the requirements for the degree of Doctor of Philosophy in Veterinary Science, Institute of Veterinary, Animal and Biomedical Sciences, Massey University, Palmerston North, New Zealand." 2006. http://hdl.handle.net/10179/1466.

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Activation of spinal N-methyl-D-aspartate (NMDA) receptors stimulates cyclooxygenase and nitric oxide pathways. Compounds that block the activity of these NMDA receptor systems reduce pain hypersensitivity. However, their usefulness is limited by the side effects they produce. One way of reducing side effects is by combining drugs that produce the same overt effect by different mechanisms, which hopefully increase the net effect. In these series of studies, drugs that interact with NMDA receptor systems and their combinations were screened in vitro to identify spinal antinociceptive synergisti

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Sandiford, Anna. "Palynology and tephrostratigraphy of Quaternary coverbed sequences of the Auckland area, New Zealand." 2001. http://hdl.handle.net/2292/2218.

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This thesis presents the results of detailed palynological and tephrostratigraphic investigations of five sites around the Auckland Isthmus, which collectively contain a fragmented record spanning approximately the last 1.2 million years. A range of additional methods were applied including, radiometric dating, palaeomagnetism, identification of other palynomorphs and fossil wood, and calculation of deposition rates. Study of two late Quaternary sites provided information on the Last Glacial Maximum (LGM) environment of the Auckland Isthmus. This suggested LGM forest was spatially restricted,

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