The Effect of Added Sucrose on the Digestibility of Protein and Fiber by Swine

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Abstract
Studies were conducted with pigs to measure the influence of added sugar upon the digestibility of the crude protein and the crude fiber of barley. Adding 16% of sucrose lowered the apparent digestibility of the crude protein and the crude fiber approximately 5% and 38%, respectively. The depression of protein digestibility was found to be greater than could be explained by an increase in the excretion of “fiber-bound” protein. Fecal nitrogen fractionation revealed more nitrogen present as bacteria, as soluble nitrogen and residual nitrogen when sucrose was added than when barley was fed alone. The depression in digestibility of protein and crude fiber as the result of feeding sugar seems to be similar in magnitude to the depressions observed with ruminants.