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Measurement and time domain analysis of heart rate variability in dairy cattle

explained by hepatocytic degeneration and necrosis, with loss of urea cycle enzymes and secondary hyperammonaemia (Vallema and others 1999), although a direct influence of cobalt or vitamin B12 deficiency on brain energy metabolism in the development of lesions cannot be excluded (Suttle 1988). The possibility of cobalt deficiency should be investigated whenever illthrifty lambs are presented soon after an improvement in their diet, with non-specific neurological signs such as head pressing, ataxia and ear twitching. It has been suggested that ovine white liver disease may be triggered by factors such as ingestion of pasture rich in readily digestible carbohydrates (Ulvund 1990). In this study, it is possible that the acute fatty liver changes and subsequent hepatic encephalopathy were triggered by the sudden change in diet from rough hill pasture to sugar beet pulp. While a gradual improvement in diet is preferable to a sudden change, this is not always practical. A general recommendation is therefore made that any cause of illthrift is first diagnosed and corrected before implementing sudden dietary changes.