![]() ![]() ![]() Intramuscular fat (IMF) and fatty acid (FA) profiles were determined in 160 bulls of the Bos taurus (n = 75) and Bos indicus (n = 85) genetic groups, finished on pasture (n = 46) or with grain supplementation (n = 114) and slaughtered in a commercial abattoir. Longissimus thoracis of commercial Brazilian beef and to assess how those profiles are influenced by finishing system, genetic group, and their interaction. At least three factors related to the host prion protein are known to modulate susceptibility or resistance to a TSE: amino acid sequence, atypical number of octapeptide repeats, and expression level. Brunelle, Brian W Greenlee, Justin J Seabury, Christopher M Brown, Charles E Nicholson, Eric M Background Transmissible spongiform encephalopathies (TSEs) are neurodegenerative diseases that affect several mammalian species. In Expt 4, the relationship between urinary purine derivative excretion (Y mmol/d) and digestible organic matter intake (X, kg/d) was defined by the equation: Y=7.69 (SE 4.2)+5.69 (SE 1.68) X n 16, Se 1.31, r 0.67. Allantoin was removed from plasma at an estimated fractional rate of 0.273 (SE 0.081) per h and mean retention was 3.66 (SE 1.08) h. ![]() The cumulative recovery of the isotope in urine was 82 (SE 6.69)%, and uric acid plasma removal, pool size and mean retention time were 0.284 (SE 0.051) per h, 5.45 (SE 0.823) mmol and 3.52 (SE 0.521) h, respectively. The kinetics of uric acid were measured by intravenous pulse dose of 1,3-15Nuric acid (Expt 3). ![]() By d 11, the respiratory rate and core body temperature increased (P 0.05) being in plasma 0.60 (SE 0.36) units/l per min. Wet bulb temperature (WBT) was used to give a combined measure of dry bulb temperature and relative humidity and was increased over several days, culminating in 5 d at 32 degrees C WBT between d 7 and 11. The treatment was designed to be representative of a long-haul, live-export voyage leaving a southern Australian winter and traveling to a Middle Eastern summer. Each experiment was carried out in climate-controlled rooms, where heifers were exposed to 15 d of sustained heat and humidity. Beatty, D T Barnes, A Taylor, E Pethick, D McCarthy, M Maloney, S K Two experiments were conducted to investigate the physiological responses of Bos taurus (Angus cross, n = 6) and Bos indicus (Brahman, n = 6) cattle to prolonged heat and humidity, as can occur during live export by sea. ![]()
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