The Prediction of the Digestible Amino Acid Supply in Barley-Soybean Meal or Canola Meal Diets and Pancreatic Enzyme Secretion in Pigs

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Abstract
Five barrows, initial weight 45 kg, were fitted with T-cannuIas to determine the ileal amino acid (AA) digestibilities in five diets in a 5 × 5 Latin square. Diet 1 (B) contained 93.3% barley; diet 2 (SBM) contained 40% soybean meal, 43.6% cornstarch and 10% dextrose; diet 3 (B + SBM) contained 40% soybean meal and 53.7% barley; diet 4 (CM) contained 50.0% canola meal, 34.1% cornstarch and 10% dextrose; diet 5 (B + CM) contained 40% canola meal and 53.6% barley. The remainder consisted of tallow (4%), chromic oxide (.5%) and a vitamin-mineral mixture. The pigs were fed 800 g twice daily, at 0800 and 2000. Digesta were collected during 2 d following a 10-d adaptation period. The digestibilities of the B + SBM and B + CM diets were calculated from digestibilities determined in the single ingredients and the proportion of the ingredients in the complete diet. There were no differences (P > .05) between the calculated and observed digestibilities of the indispensable AA in B + SBM, Calculated digestibilities tended to be lower than observed digestibilities in B + CM. Of the indispensable AA, the differences (percentage units) were significant for lysine (7.3) and phenylalanine (6.4). An additional four barrows of similar weight were prepared for collection of pancreatic juice and fed the SBM and CM diets according to a cross-over design. The pigs were fed 800 g twice daily, at 0800 and 2000. Pancreatic juice was collected during 2 d following a 10-d adaptation period. There was no effect of diet (P > .05) on the rate of secretion of protein, trypsin and chymotrypsin. The present studies show that the digestible AA supply in a diet can be predicted from AA digestibilities determined in the single ingredients; the calculated AA digestibilities were equal to or slightly lower than those observed. Furthermore, the lower digestibilities of AA in CM than in SBM (78.2 vs 85.4% for the average of the indispensable AA) did not result from differences in-pancreatic protein and enzyme secretion. Copyright © 1988. American Society of Animal Science . Copyright 1988 by American Society of Animal Science

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