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Influence of the concentration of peptides on [15N]ammonia incorporation and de novo synthesis of different amino acids by mixed microorganisms from the sheep rumen in vitro

  • C. Atasoglu (a1), N.D. Walker (a1), C.J. Newbold (a1) and R.J. Wallace (a1)

Extract

Ammonia plays an important role in providing N for protein synthesis by rumen microorganisms. Studies using [15N]ammonia or [15N]urea indicate that the proportion of microbial nitrogen derived from ammonia is highly variable, ranging from 18 to 100% (Nolan, 1975; Salter et al., 1979). Peptides and amino acids are also incorporated by rumen microorganisms. They generally stimulate growth (Argyle & Baldwin, 1989), but little is known about the factors which govern the relative proportions of microbial amino acids which are derived from pre-formed amino acids and from ammonia. The present study was undertaken to determine how the concentration of peptides affects ammonia incorporation and the de novo synthesis of individual amino acids by mixed rumen microorganisms.

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Argyle, J.L. & Baldwin, R.L. (1989). Effects of amino acids and peptides on microbial growth yields. Journal of Dairy Science 72, 20172027.
Nolan, J. (1975). Quantitative models of nitrogen metabolism in sheep. In Digestion and metabolism in the Ruminant (McDonald, I. W> & Warner, A.C.I, editors), pp. 416431. Armidale, Australia: University of New England Publishing Unit.
Salter, D.N., Daneshvar, K. & Smith, R.H. (1979). The origin of nitrogen incorporated into compounds in the rumen bacteria of steers given protein- and urea- containing diets. British Journal of Nutrition 41:197.

Influence of the concentration of peptides on [15N]ammonia incorporation and de novo synthesis of different amino acids by mixed microorganisms from the sheep rumen in vitro

  • C. Atasoglu (a1), N.D. Walker (a1), C.J. Newbold (a1) and R.J. Wallace (a1)

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