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Influence of Diet on Passage Rate and Apparent Digestibility by Growing Swine¹

Purdue University, West Lafayette,Indiana 47907

Abstract

Growing barrows were used in metabolism studies to investigate the effect of type of dietary carbohydrate on passage rate and apparent digestibility of dry matter, nitrogen, calcium, magnesium, potassium and sodium. Rations were altered by varying the levels of glucose, lactose and corn starch. Diets containing starch consistently promoted slower passage rates than did those containing lactose or glucose. Glucose diets resulted in the most rapid passage rates (P < .01). There was a definite trend for slower passage time to result in higher digestibility. Sodium digestibility failed to exhibit any definable tendency.

On the basis of criteria studied, starch promoted the best overall animal performance while lactose was better than glucose. Pigs fed glucose had a greater inclination to incur diarrhea than pigs fed starch or lactose. Diarrhea resulted in significantly (P < .01) increased passage rates and significantly lower digestibility values (P < .01, P < .05) especially regarding calcium and magnesium (P < .01) both of which showed negative balances. Diarrhea also caused a dramatic reduction in feed consumption. At 50% dietary levels, starch favored dry matter, nitrogen (P < .01), potassium (P < .05) and sodium digestibility and feed conversion while lactose improved calcium (P < .01) and magnesium (P < .01) digestibility. Fifty percent starch or lactose resulted in nearly equal mean passage times. Lactose fed pigs performed well and did not develop diarrhea.

¹ Department of Animal Sciences, Journal Paper No. 4914, Purdue University Agricultural Experiment Station.

² Present address: Animal Science Department, University of Florida, Gainesville 32601.

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