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Effects of cattle grazing on the food abundance of prairie bird species in Grasslands National Park, SaskatchewanSelinger, Allison 24 August 2010 (has links)
Grassland bird species have declined dramatically since 1966. This decline can be linked to changes in land use practices, such as grazing. I examined the effects of cattle grazing on the abundance of birds by testing the predictions of the More Individuals Hypothesis (MIH). The study was conducted in Grasslands National Park of Canada (GNPC) in Saskatchewan. Point counts were used to sample richness and relative abundance of birds. I sampled two groups of invertebrates: grasshoppers and carabid beetles. In addition, vegetation measurements were taken to assess the intensity of grazing. I found that (1) grasshopper abundance, richness and diversity were higher in grazed pastures; (2) carabids showed mixed responses to grazing; (3) bird abundance was correlated with carabid abundance, thus supporting the assumptions of the MIH. Overall, my results indicate that grazing can be beneficial for both birds and their invertebrate prey in southern Saskatchewan mixed-grass prairies.
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USING MICROHISTOLOGICAL TECHNIQUES TO PREDICT BOTANICAL COMPOSITION OF HORSE DIETS ON COOL-SEASON GRASS PASTUREMorrison, Jesse Ira 01 January 2008 (has links)
Microhistological analysis is a highly effective microscopic technique of determining botanical composition of animal diets by visual recognition of fecal plant fragments, and has been widely used in range studies. The objective of this study was to use microhistological techniques to predict the botanical composition of domesticated horse diets when grazing mixed cool-season pasture. Samples of tall fescue [Lolium arundinaceum (Schreb.) S.J. Darbyshire], Kentucky bluegrass (Poa pratensis L.) and orchardgrass (Dactylis glomerata L.) were evaluated for microscopically unique characteristics. Cool season pasture grazing studies were conducted in October 2006 and May 2007 in Lexington, KY. Eight thoroughbred mares were placed in individual paddocks of varying botanical compositions to graze for six days. For each percent increase of tall fescue or orchardgrass in the paddock, there was a corresponding increase of 0.44% and 0.42%, respectively, in the diet. In conclusion, microhistological analysis is a useful tool for determining botanical composition of horse diets when grazing cool season grass pastures.
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The use of foliage from multipurpose trees to manipulate rumen fermentationAltaye, Belete Teferedegne January 2000 (has links)
No description available.
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Effects of cattle grazing intensity on vegetation structure, heterogeneity and plant diversity in a northern mixed-grass prairieLwiwski, Tonya 04 July 2013 (has links)
Re-introducing heterogeneity to native North American rangelands is imperative to maintaining grassland biodiversity, and it has been suggested that using a variety of cattle grazing intensities on the landscape could accomplish this. I used generalized linear mixed models to describe the effects of grazing intensity on vegetation structure, plant species diversity and plant communities over four years. I used the Mantel test and non-metric multidimensional scaling to illustrate changes in plant communities with varying grazing intensities and over time. Effects of grazing were cumulative and changed over time, upland and lowland habitats responded differently to grazing intensity, and heterogeneity was maximized at the landscape scale under a variety of grazing intensities. When conservation is the primary goal, a variety of grazing intensities on the landscape can be used to increase heterogeneity, and therefore grassland biodiversity.
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Effects of cattle grazing on the food abundance of prairie bird species in Grasslands National Park, SaskatchewanSelinger, Allison 24 August 2010 (has links)
Grassland bird species have declined dramatically since 1966. This decline can be linked to changes in land use practices, such as grazing. I examined the effects of cattle grazing on the abundance of birds by testing the predictions of the More Individuals Hypothesis (MIH). The study was conducted in Grasslands National Park of Canada (GNPC) in Saskatchewan. Point counts were used to sample richness and relative abundance of birds. I sampled two groups of invertebrates: grasshoppers and carabid beetles. In addition, vegetation measurements were taken to assess the intensity of grazing. I found that (1) grasshopper abundance, richness and diversity were higher in grazed pastures; (2) carabids showed mixed responses to grazing; (3) bird abundance was correlated with carabid abundance, thus supporting the assumptions of the MIH. Overall, my results indicate that grazing can be beneficial for both birds and their invertebrate prey in southern Saskatchewan mixed-grass prairies.
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Pastoral development in Eritrea and Eastern Sudan : implications for livestock extension programmesFre, Zeremamiam January 1989 (has links)
No description available.
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Ultraviolet detectors for solar observations on the SOHO spacecraftBreeveld, Alice Antonia January 1995 (has links)
No description available.
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Investigating the role of carbohydrates in the dietary choices of ruminants with an emphasis on dairy cows /Francis, Sally Amanda. January 2002 (has links)
Thesis (Ph.D.)--University of Melbourne, School of Agriculture and Food Systems, Institute of Land and Food Resources, 2002. / Typescript (photocopy). Includes bibliographical references (leaves 182-198).
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In search of greener pastures : sustainable development for Kazak pastoralists in Xinjiang, China /Cerny, Astrid. January 2008 (has links)
Thesis (Ph. D.)--University of Washington, 2008. / Vita. Includes bibliographical references (p. 300-330).
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Effects of alternative grass species on grazing preference of sheep for white clover : a thesis submitted in partial fulfilment of the requirements for the degree of Master of Agricultural Science at Lincoln University, Canterbury, New Zealand /Muraki, Tomohiro. January 2008 (has links)
Thesis (M. Agr. Sc.) -- Lincoln University, 2008. / Also available via the World Wide Web.
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