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

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

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23 Scopus citations

Abstract

A nitrogen balance and a whole-body protein turnover experiment was carried out with 12 growing female crossbred pigs, 45 kg bodyweight (BW) to study the effect of increasing dietary levels of dispensable amino acids (DAA, 5%, 9% and 14%) at constant contents of indispensable amino acids (7%). 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 2.48g/kg BW75 for low, medium and high DAA levels. The dietary protein was absorbed completely irrespective of treatment. Raising dietary DAA increased urinary N excretion and N retention (urinary N, 0.16, 0.44 and 0.80g/kg BW0.75/day; N retention, 1.20, 1.42 and 1.58 g/kg BW75/day). Whole-body protein synthesis and degradation varied from 4.31 to 7.44 g N/kg BW0.75/day and from 2.88 to 6.24 g N/kg BW0.75/day. The respective minimum values were observed at the medium DAA level. It appears that the coupling of anabolic processes of protein metabolism was maximal at medium dietary DAA contents.

Original languageEnglish
Pages (from-to)232-238
Number of pages7
JournalJournal of Animal Physiology and Animal Nutrition
Volume81
Issue number4-5
StatePublished - Aug 1999

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