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Comparative Availability of Amino Acids in OAC Wintri Triticale and Corn for Pigs^1,2,

University of Guelph⁴, Guelph, Ontario, Canada N1G 2W1

Abstract

Availability of amino acids in two samples of OAC Wintri triticale (triticale A, 15.5% protein and triticale B, 10% protein; on a dry matter basis) and corn were determined using nine Yorkshire- Landrace crossbred barrows, fitted with ileocecal simple T-cannulae, in a replicated 3 x 3 Latin square experiment. Metabolic fecal and ileal amino acids were determined with barrows fed a "nitrogen-free" diet. All indispensible amino acids except isoleucine, methionine and valine were more (P<.05) available in corn than in either triticale, when measured at the terminal ileum. Triticale A had higher (P<.05) availability of indispensable amino acids determined from ileal digesta than triticale B, except for aginine and threonine. Availabilities of lysine and threonine measured at the terminal ileum increased (P<.05) in the following order: triticale B < triticale A < corn. Availabilities based on fecal analysis for most essential amino acids except isoleucine, lysine and valine were greater (P<.05) in corn than triticale. Triticale B had lower (P<.05) availabilities of most essential amino acids by fecal analysis, except arginine, than triticale A. A net disappearance (P<.10) of the amino acids, except lysine and phenylalanine in corn and isoleucine and lysine in triticale B, occurred in the large intestine. Proline, glycine and threonine represented over 60% of the amino acids in metabolic ileal digesta.

¹ The study was supported by the Ontario Ministry of Agr. and Food and the Ontario Pork Producers' Marketing Board.

² The equipment for amino acid analysis made available by Dr. R. O. Ball and the technical assistance of Mr. Y. T. Yao are thankfully acknowledged.

³ Recipient of a Canadian Commonwealth Scholarship.

⁴ Dept. of Anim. and Poul. Sci.

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