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The Binding of Dietary Protein by Sorghum Tannins in the Digestive Tract of Pigs

Department of Animal and Poultry Science, University of Saskatchewan, Saskatoon, Saskatchewan, Canada, S7N 0W0 ^* Plant Biotechnology Institute (formerly Prairie Regional Laboratory) of the National Research Council of Canada, Saskatoon, Saskatchewan, Canada, S7N 0W9

The effects of reconstitution of sorghums on dry matter, energy, protein and amino acid digestibilities, and the nature of protein binding by sorghum tannins during digestion were investigated. Grains from a high and a low tannin sorghum were reconstituted by adding 30% (wt/wt) distilled water to the grain and stored at 25°C for 20 days with an acetic-propionic acid mixture added to deter fungal growth. Another lot of grain from the same sources was untreated and used as control. The sorghum grains were then incorporated at an 85% level in diets for a digestibility trial with pigs cannulated at the terminal ileum. The digestibilities of dry matter, protein and amino acids at the terminal ileum were lower than the corresponding values measured over the total digestive tract. Reconstitution improved the digestibilities of dry matter, energy, protein and amino acids in the high but not low tannin sorghum diets. The improvement in digestibility of individual amino acids ranged from 7.5 to 23.5%. The tannin-associated proteins were more hydrophobic than the dietary protein. The results suggest that hydrophobic bonding is important in the formation of tannin-protein complexes in the digestive tract of pigs.

KEY WORDS: • tannin • sorghum • reconstitution • amino acids • swine • digestibility • hydrophobic bonding

¹ The senior author was on a Kenya Government Fellowship.

² Present address: Department of Animal Science, University of British Columbia, Suite 248, 2357 Main Mall, Vancouver, B.C. V6T 2A2.

Manuscript received 20 December 1983.

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