Abstract
A comparative study of various metabolic processes between conventional goats, gnotobiotic goats, and rats was conducted. Glucose tolerance half-lives were determined in nine gnotobiotic and three conventional goats. In addition, the hepatic activity of glucose-6-phosphatase, pyruvate kinase, and succinic dehydrogenase was determined in four gnotobiotic and two conventional goats and compared with hepatic enzyme activities in rats maintained on an identical diet. Differences between the gnotobiotic and conventional goats in any of these parameters were not demonstrated. A correlation coefficient of 0.949 (P<.01) between glucose half-lives and pyruvate kinase activity was demonstrated and in addition a correlation coefficient of 0.861 (P<.05) between pyruvate kinase activity and glucose-6-phosphatase activity was demonstrated. Data suggested that changes with age in blood glucose concentrations, glucose half-lives, and hepatic gluconeogenesis of ruminants were not dependent on rumen development and volatile fatty acid production.
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