J. Anim Sci.
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J. Anim Sci. 1981. 52:557-566.
© 1981 American Society of Animal Science
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Effect of Sorghum Particle Size on Digestibility of Nutrients at the Terminal Ileum and over the Total Digestive Tract of Growing-Finishing Pigs1

Walter F. Owsley2, D. A. Knabe and T. D. Tanksley, Jr.

Texas Agriculture Experiment Station,3 College Station 77843

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.

Footnotes

1 T. A. 16305, Texas Agr. Exp. Sta.

2 Present address: Texas Tech Univ., Lubbock.

3 Dept. of Anim. Sci.






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Copyright © 1981 by the American Society of Animal Science.