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Studies of the Metabolizable and Productive Energy of Glucose for the Growing Chick

Agricultural Experiment Station, and Graduate School of Nutrition, Cornell University, Ithaca, New York

The metabolizable and productive energy of glucose for the growing chick have been established by two methods. In the first, a known proportion of glucose was omitted from the standard reference diet, and the altered diet was pair-fed to equalize the intake of non-glucose components. In the second, graded levels of cellulose were used to replace equal amounts of glucose. Simultaneous measurements of metabolizable energy (by combustion of feed and excreta) and productive energy (by carcass analysis) were made.

The average metabolizable energy of glucose was found to be 3.64 Cal. per gram of dry matter by the two methods. The experiments with cellulose showed no evidence of any negative effect of cellulose on utilization of other components of the diet.

The productive energy of glucose was estimated to be 3.32 and 2.48 Cal. per gram by the two respective methods. The average, 2.90 Cal. per gram, is approximately 80% of its metabolizable energy, which is in general agreement with the relation of productive energy and metabolizable energy values observed in previous work.

Manuscript received 27 February 1958.