Includes bibliographical references (leaves 105-121) / x, 121, [39] leaves : ill., maps ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Investigates the palatability variation in Atriplex vesicaria Heward ex Benth. (bladder saltbush). The main aim of the research was to examine the idea that the sex phenotypes of this species differ in their palatability to sheep, and to characterise some of the temporal and spatial features of the phenomenon. Intensive small-plot dietary trials, supported by a paddock dietary experiment, cross-fence comparisons and cafeteria trials, showed that sheep preferentially grazed female saltbushes over male and bisexual ones. Sheep avoided male saltbushes due to a chemical deterrent, and used visual (male flower spike) and olfactory cues to detect male plants. The effect of this selective grazing was to reduce the size and reproductive output of female shrubs. Sheep also tended to return to shrubs they had grazed previously. In the semi-arid regions of South Australia, where bladder saltbush is grazed year-round, physical protection is recommended to maximise survival and reproductive output of heavily grazed shrubs. / Thesis (Ph.D.)--University of Adelaide, Depts. of Environmental Science & Management and Botany, 1999?

308 p. : ill. ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Thesis (Ph.D.)--Dept. of Botany, University of Adelaide, 1976

Alternative grazing systems and pasture types for wool production in the south west of Western Australia were analysed using bio-economic modelling techniques in order to determine their relative productivity and profitability. After reviewing the experimental and modelling literature on perennial pastures and grazing systems, seven case studies of farmers were conducted in order to investigate the practical application of innovative grazing systems and use of perennial pastures. Together these case studies provided information for identifying relevant variables and for calibrating the modelling work which followed. The core of the work lies in a bio-economic model for investigating the comparative value of the three grazing systems and two pasture families mentioned above. A baseline scenario using currently available and reliable scientific data provides baseline results, after which a number of sensitivity analyses provide further insights using variations of four key parameters: persistence, heterogeneity, water soluble carbohydrates, and increased losses. Results show that perennial pastures are in the studied region more profitable than annual pastures. Under current baseline conditions, continuous grazing with perennial pastures is the most profitable enterprise, but this superiority is not robust under parameter variations defined by other scenarios. The more robust solution in terms of enterprise profitability is cell grazing with perennial pastures. The results indicate that intensive grazing systems such as cell grazing have the potential to substantially increase the profitability of grazing operations on perennial pasture. This result is an encouraging one in light of its implications for water uptake and salinity control. It means that economics and land care can go hand in hand, rather than be competitive. It is to be noted that it is the choice of the grazing system in combination with the pasture species, rather then the pasture species itself, that allows for such complementarity between economics and sustainable land use. This research shows that if farmers adopt practices such as cell grazing they may be able to increase the area that they can profitably plant to perennial pasture thus reducing the impacts of dryland salinity. This finding is consistent with the findings of the case studies where the farmers perceived that, provided grazing was planned, increasing the intensity of their grazing management and the perenniallity of their pastures would result in an increase in the profitability of their grazing operation. As a result this research helps to bridge a gap which has existed in this area of research, between the results of scientific research and those reported in practice.

Thesis (Ph. D.)--University of Adelaide, 1994. / Includes bibliographical references (leaves 259-291).

Thesis (Ph.D.)--University of Adelaide, Dept. of Environmental Biology, 2002. / Accompanying CD-ROM inside back cover, includes Appendices. Bibliography: leaves 242-266.

Thesis (M.S.), Biology--University of Central Oklahoma, 2008. / Includes bibliographical references (leaves 98-104).

Habilitationsschrift--Universität Münster with title: Die Wanderviehwirtschaft in den Hochgebirgs- und Beckenlandschaften der westlichen USA und ihre Auswirkungen im Naturraum. / Includes English summary. Includes bibliographical references (p. 419-469).

Thesis (M.S.)--Oregon State University, 2009. / Printout. Includes bibliographical references (leaves 69-73). Also available on the World Wide Web.

Habilitationsschrift--Universität Münster with title: Die Wanderviehwirtschaft in den Hochgebirgs- und Beckenlandschaften der westlichen USA und ihre Auswirkungen im Naturraum. / Includes English summary. Includes bibliographical references (p. 419-469).

The entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract appears in the public.pdf file. Title from PDF of title page (University of Missouri--Columbia, viewed on Feb. 11, 2010). Thesis advisor: Dr. Robert L. Kallenbach. Vita. Includes bibliographical references.