Effect of Sorghum Particle Size on Digestibility of Nutrients at the Terminal Ileum and over the Total Digestive Tract of Growing-Finishing Pigs

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Abstract
The effect of sorghum particle size on nutrient digestibilities at the terminal ileum and over the total digestive tract of growing-finishing pigs were investigated in a replicated 3x3 Latin square trial. Sorghum-casein diets were used. Sorghum was dry rolled (C) or ground in a hammer mill through 6.4 mm (M) or 3.2 mm (F) screens, producing particles with a modulus of fineness of 3.57, 2.85 or 2.36, respectively. Each successive reduction in particle size improved (P<.05) the apparent ileal digestibility of dry matter, starch, gross energy and N. Measured over the total digestive tract, digestibilities of these components were highest (P<.05) for the F diet but they did not differ (P>.10) between diets M and C because of increased (P<.05) disappearance in the large intestine of dry matter, starch and gross energy from the C diet. N loss in the large intestine was also higher for pigs fed diet C than for those fed diet M, but the difference was not significant. The digestibilities of most amino acids at the terminal ileum were improved (P<.05) as particle size decreased. Lysine digestibilities were not affected (P>.10). Amino acid digestibilities measured over the total digestive tract were consistently higher (P<.05) for diet F than diets M and C, which did not differ (P>.10) from one another. A comparison of ileal and total tract digestibilities indicated a net disappearance of all measured amino acids except lysine during large intestine transit. These data indicate that increasing fineness of grind will improve digestibility of nutrients in sorghum by growing-finishing pigs. Copyright © 1981. American Society of Animal Science. Copyright 1981 by American Society of Animal Science

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