Browsing University of Missouri-Columbia by Thesis Advisor "Spiers, Donald E."
Now showing items 1-8 of 8
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Comparison of thermoregulatory mechanisms in heat sensitive and tolerant breeds of Bos taurus cattle
(University of Missouri--Columbia, 2008)Two Bos taurus breeds with known differences in heat tolerance were tested under controlled conditions to evaluate heat tolerance. Romosinuano (RO) is a tropically adapted breed. Nine Angus (304 [plus or minus] 7 Kg BW; ... -
Determining best predictors of animal performance in feedlot steers
(University of Missouri--Columbia, 2015)Two studies were performed in a feedlot environment to determine the long-term effects of heat events on animal performance and well-being. Experiments in this thesis were designed to pinpoint ambient variables that most ... -
Effect of endophyte-infected tall fescue on hepatic gene expression in cattle
(University of Missouri--Columbia, 2013)[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT AUTHOR'S REQUEST.] Fescue toxicosis may result from the intake of ergot alkaloids found in endophyteinfected (E+) tall fescue. The liver if the major organ involved in ... -
Effects of heat stress and fescue toxicosis on the immune system and other physiological parameters
(University of Missouri--Columbia, 2010)Tall fescue is widely used as pasture grass in the United States, and is the most important cool season grass for grazing animals. Certain fungi also grow on these grasses which produce toxins, resulting in reduced feed ... -
Feed intake component of fescue toxicosis during short-term exposure to thermoneutral and heat stress conditions
(University of Missouri--Columbia, 2008)[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT AUTHOR'S REQUEST.] Fescue toxicosis is results from intake of tall fescue grass containing a fungal endophyte. It affects most of herbivore species, including rodents. ... -
Response of Bos taurus cattle to fescue toxicosis and heat stress comparing by region and breed
(University of Missouri--Columbia, 2011)Two studies were performed to determine response differences in heat-sensitive and -tolerant Bos taurus cattle to heat stress and fescue toxicosis in controlled and field environments. Romosinuano (RO), a tropically adapted ... -
Temporal effects of fescue toxicosis and heat stress on rat physiology and hepatic gene expression
(University of Missouri--Columbia, 2007)Fescue toxicosis results from intake of toxins in fescue containing an endophytic fungus, Neotyphodium coenophialum. Time-related changes in rats associated with intake of an endophyte-infected fescue diet (E+) were evaluated ... -
Utilizing laboratory and field studies to determine physiological responses of cattle to multiple environmental stressors
(University of Missouri--Columbia, 2012)Heat stress and fescue toxicosis, resulting from intake of endophyte-infected fescue, have significant impacts on physiological processes in cattle. To study this impact, we used numerous physiological measures of thermal ...