Influence of dietary level of dispensable amino acids on nitrogen balance and whole-body protein turnover in growing pigs

Roth, F.X.; Gotterbarm, G.G.; Windisch, W.; Kirchgessner, M.

Journal of Animal Physiology and Animal Nutrition 81(4/5): 232-238

1999


ISSN/ISBN: 0931-2439
Accession: 003174379

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Abstract
A nitrogen balance and whole-body protein turnover experiment was conducted with 12 female pigs, 45 kg liveweight, given diets containing 5, 9 or 14% non-essential amino acids (NEAA) and 7% essential amino acids. Whole-body protein turnover was determined using the end product method after a single oral dose of 15N-glycine to a semisynthetic diet. Daily N intake was 1.45, 1.96 and 2,48 g/kg for the low, medium and high NEAA diets, respectively. Dietary protein was absorbed completely for all diets. Increasing dietary NEAA increased urinary N output and N retention (urinary N, 0.16, 0.44 and 0.80 g/kg0.75; N retention, 1.20, 1.42 and 1.58 g/kg0.75). Whole-body protein synthesis and degradation ranged from 4.31 to 7.44 and from 2.88 to 6.24 g N/kg0.75 per day, respectively. Minimum values were observed at the medium NEAA level.