Corn Gluten Feed in Swine Diets and Effect of Pelleting on Tryptophan Availability to Pigs and Rats

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Abstract
CORN gluten feed contains on the average 22% (21 to 25%) crude protein, 2.0% (1.0 to 4.0%) ether extract and 9.0% (7.0 to 10.0) crude fiber (Cooley, 1970). And it has traditionally been classified as a protein supplement feed. Evvard (1920) reported that when corn gluten feed was mixed with tankage feed consumption and rate of gain of finishing swine were reduced. He attributed this adverse effect to the increase in crude fiber and reduced acceptability of the mixture by the pig. Several workers (Troelsen and Bell, 1962; Seerley, Miller and Hoefer, 1962; Laird and Robertson, 1963; Jensen and Becker, 1965; Hintz and Garrett, 1967; Chamberlain et al., 1967) have shown improved feed utilization as a result of pelleting diets or diet ingredients. The present study was conducted to study (1) the value of corn gluten feed (CGF) as a replacement for corn or for corn and soybean meal in diets for swine, (2) the effect of pelleting on utilization of CGF-containing diets by pigs and (3) the effect of pelleting of CGF on the availability of its tryptophan to pigs and rats.

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