Haley Masters

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Four natural occurrences of zinc toxicity in sheep and one in calves were studied. To assist in the confirmation of a diagnosis of zinc toxicity, 2 experiments were conducted in which sheep were given toxic amounts of zinc. The clinical findings, clinical pathology, and gross and microscopic pathology are given. Clinical manifestations included inappetance,(More)
Immunity in 12 weaner Merino sheep fed a low selenium (Se) diet (low Se sheep) was compared with that in 10 matching sheep fed the same diet but each given an intraruminal Se pellet (high Se sheep), while the sheep were housed in individual, sheltered pens. All sheep were challenged with killed Brucella abortus cells (days 0 and 28), rabbit red blood cells(More)
White Muscle Disease of sheep occurs in Western Australia as distinct syndromes in lambs and weaner sheep. Mean liver selenium concentrations of lambs and weaners with WMD and unaffected by WMD were 0.19 and 0.46 ppm, and 0.20 and 0.41 ppm (dry weight) respectively. There was considerable overlap between levels suggesting that selenium status was not the(More)
Three experiments were carried out using Merino wethers to investigate if oral administration of zinc sulphate would provide protection against the liver damage that occurs in lupinosis. At the same time, the effect of this zinc therapy on liver and pancreas zinc, and liver copper concentrations, was studied. The zinc therapy caused increases in liver and(More)
Enrichment from the easily accessible blood amino acid pool is commonly used as precursor enrichment to calculate rates of muscle protein fractional synthesis in relevant human studies in lieu of the less accessible muscle fluid amino acid pool. However, the accuracy of this approach depends largely on the extent to which there is low discrepancy in free(More)
Outbreaks of Hepatosis Dietetica (HD), Nutritional Myopathy (NM) and Mulberry Heart Disease (MHD) in Western Australia are described. Hepatic selenium concentrations were low in pigs with HD and NM, but not with MHD. The mean hepatic selenium concentration in pigs unaffected with these conditions was 1.07 +/- 0.12 ppm dry wt. Cereal grain in an area of(More)
Merino wether weaners were exposed to toxic lupin stubbles for periods of one, two and six to nine weeks, and the effect on their liver copper, selenium and zinc concentrations studied. After the one week period there was a slight decrease in liver copper and selenium concentrations in sheep severely affected with lupinosis. This was attributed to loss of(More)