Digestibility of nitrogen and amino acids in soybean meal with added soy hulls

This study was designed to quantify the effect of soy hulls on Nitrogen(N) and amino acid (AA) digestibilities of soybean meal for growing pigs. Soy hulls were incorporated into 17% CP diets containing 33.25% soybean meal (SBM) at 0, 3, 6, or 9% (as-fed basis) and fed to 35-kg barrows to determine their effect on apparent and true digestibility of DM, GE, N, and AA measured at the terminal ileum. Positive and negative control diets containing 1.05% lysine were formulated with 35% SBM and 27% soy protein concentrate (SPC), respectively. A low-protein, casein-based diet was used to estimate endogenous AA losses. Soy hulls were incorporated into experimental diets at the expense of cornstarch, and SBM levels were adjusted to accommodate the contribution of CP from soy hulls. Fourteen pigs were surgically fitted with simple T-cannula at the distal ileum and fed the seven semi purified cornstarch diets based on a replicated 7 z 7 Latin square design. Each period lasted 7 d, with diet acclimation from d 1 to 5 and ileal sample collection for 12 h on d 6 and 7. Feed was offered at a level of 90 g/kg BW0.75 in two equal portions at 0800 and 2000. Apparent ileal digestibilities of DM and GE decreased approximately six percentage units with the addition of soy hulls (linear, P < 0.05), whereas N was not affected. Both apparent and true ileal digestibilities of arginine, histidine, lysine, phenylalanine, aspartic acid, serine, and tyrosine also exhibited a decrease (linear, P < 0.05) of up to five percentage units with the addition of soy hulls. True ileal lysine digestibility of SBM decreased from 90.3 to 87.7% with the addition of 9% soy hulls. The endogenous nutrient fraction measured at the distal ileum was rich in proline, glutamic acid, and glycine, with losses greater than 1,000 mg/ kg of DMI for each AA, and contained minimal amounts of tryptophan, methionine, and cystine. The current data suggest that a 0.2% decrease in some true ileal indispensable AA digestibilities may result with each 1% increase in soy hull inclusion in semi purified diets containing SBM as the sole source of AA as fed to growing pigs

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Product / service:	Enzymes
Publication date:	01/01/2004
Species:	Pig
Authors:	Dilger RN, Sands JS, Ragland D, Adeola O
Doctype:	Publications & Citations
Publication / conference:	Journal of Animal Science, volume 82
Regions and countries:	Global
Keywords:	amino, acid, acids, apparent, ileal, digestibility, arginine, aspartic, barrows, concentrate, control, cp, cystine, dan, diet, diets, digestibilities, dm, endogenous, feed, ge, glutamic, glycine, growing, pig, pigs, histidine, ileum, inclusion, loss, losses, lysine, meal, methionine, n, nitrogen, nutrient, p, phenylalanine, proline, protein, sbm, serine, sole, source, soy, soybean, soyhulls, true, tryptophan, tyrosine
Production challenge(s):	Performance growth, Nitrogen, Digestibility, Gut health, Environmental
Diets:	Soy hulls
Brands:	Porzyme® 9300, Axtra® XAP
Resource ref:	7782
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Digestibility of nitrogen and amino acids in soybean meal with added soy hulls

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