Métabolisme De La Flore Intestinale Du Porc. Dégradation Des Formes L Et D Des Acides Aminés

Michel, M. C.; Boche, Simone

doi:10.1051/rnd:19660103

Cited by 23 publications

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“…The different distribution of free amino acids in the two types of mice is probably due to several factors. Not only does the microflora cause modification of some nitrogenous compounds in this region of the intestinal tract (7), but several amino acids are resistant to fermentation by microflora removed from this part of the digestive tract (15). The microflora is also capable of anabolizing certain forms of nitrogen, including certain amino acids, into bacterial protein (9), thus changing the pattern of free amino acids.…”

Section: Discussionmentioning

confidence: 99%

Effect of Microflora on the Free Amino Acid Distribution in Various Regions of the Mouse Gastrointestinal Tract

Whitt¹,

Demoss²

1975

Applied Microbiology

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Section: Discussionmentioning

confidence: 99%

Effect of Microflora on the Free Amino Acid Distribution in Various Regions of the Mouse Gastrointestinal Tract

Whitt¹,

Demoss²

1975

Applied Microbiology

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“…A major influence on the composition of amino acids in the digesta after transit through the large intestine is microbial activity, and this is the probable explanation for the finding that more of the N in the faeces was in amino acid form than in ileal digesta, particularly for diet SSC ( Table 5). Michel (1966) showed that the bacterial flora of the large intestine can deaminate all amino acids, and Zebrowska (19733) showed that the N from amino acids infused into the terminal ileum was almost completely absorbed and then rapidly excreted, suggesting that the amino acids were metabolized before absorption to compounds of no nutritional value. Mason et al (1976) estimated that at least half the amino acids in pig faeces were contained in bacteria.…”

Section: I55mentioning

confidence: 99%

Studies on digestion and absorption in the intestines of growing pigs

Ag¹

1979

Br J Nutr

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National Institute for Research in Dairying, Shinfield, I . Digesta were collected from seventeen pigs initially of 30 kg live weight fitted with single re-entrant cannulas in either the duodenum, jejunum or ileum. A further twenty-four pigs were used in a conventional digestibility trial.2. The pigs received three types of diet containing: barley, fine wheat offal, white fish meal, minerals and vitamins (diet BWF); starch, sucrose, maize oil, cellulose, minerals and vitamins and either groundnut (diet SSG) or casein (diet SSC).3. Amino acids were measured in samples representative of the digesta flow in 24 h periods and in the faeces collected in 5 d periods.4. For each diet the total flow in 24 h periods in the duodenum for aspartic acid, threonine, serine and glycine exceeded or equalled intake, while the amounts of the other amino acids were usually rather less than intake.5. For each diet in the jejunum, the amounts of glycine and cystine exceeded intake in 24 h periods, while methionine, arginine and tyrosine were the most rapidly absorbed amino acids anterior to the cannula site. On average 0.22, 0.25 and 0.31 of the dietary amino acids were absorbed anterior to the cannula site for diets BWF, SSG and SSC, respectively. 6. For each diet in the ileum, the least apparently absorbed dietary amino acids were glycine and cystine. On average 0.81, 0.83 and 0.95 of the dietary amino acids were absorbed anterior to the cannula site for diets BWF, SSG and SSC, respectively.7. There was net disappearance of most amino acids in the large intestine, but some net accumulation occurred in this region.8. The results are discussed in relation to the amino acid composition of endogenous secretions (particularly glycine in bile), protease and peptidase specificity, free amino acid absorption and the role of the microflora in the large intestine.For many years the progress of digestion and absorption of dietary proteins in simplestomached animals has been studied in the rat and dog. Recently, similar studies have also been made in pigs equipped with re-entrant intestinal cannulas, usually placed in the proximal duodenum or the terminal ileum in order to estimate the total weight of protein, or amino acids, absorbed in the small intestine for example, Zebrowska & Buraczewska (1972b), Ivan & Farrell (1976). These studies have usually been made with very small numbers of animals, and have rarely used barley-based diets of the kind used in the United Kingdom and western Europe in practical pig production.The object of this study was to measure the flow of amino acids at four intestinal sites from three diets of contrasting amino acid composition in order (a) to assess the extent of addition of endogenous amino acids to the digesta in the duodenum, (b) to investigate whether the pattern of digestion and absorption of proteins differed in the jejunum, I/ Supplied (/kg diet): as vitamin mix no. I (omitting choline chloride) and in addition 2.00 mg thiamin, 50~00gg biotin, 0.50 mg pteroylmonoglutamic acid, 20.00 mg p-aminobenzo...

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The effect of dietary antibiotics on protein and energy metabolism in rats: Possible significance of the gut microflora

et al. 1979

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The influence of the intestinal microbial activity on protein metabolism was tested in rats with three diets fed without and with antibiotics (Nebacitin). True protein digestibility, biological value, net protein utilisation, true amino acid digestibility and apparent digestible energy were measured. The intestinal microbial activity was on average reduced to one-fifth by antibiotics. On a diet low in crude fibre (2.5 %) but high in crude protein (17.6%), this reduction had only a minor influence on the parameters for protein quality that were measured. However, true digestibilities of histidine and cystine were strongly reduced by the antibiotic treatment. The digestibility of energy was also significantly reduced (5 %). For diets higher in crude fibre and lower in protein, the influence of the microbial activity was more pronounced. Digestibility of protein and energy were severely reduced by the dietary antibiotic treatment. In general, antibiotic supplementation decreased the parameters that were measured.

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Métabolisme De La Flore Intestinale Du Porc. Dégradation Des Formes L Et D Des Acides Aminés

Cited by 23 publications

References 0 publications

Effect of Microflora on the Free Amino Acid Distribution in Various Regions of the Mouse Gastrointestinal Tract

Effect of Microflora on the Free Amino Acid Distribution in Various Regions of the Mouse Gastrointestinal Tract

Studies on digestion and absorption in the intestines of growing pigs

The effect of dietary antibiotics on protein and energy metabolism in rats: Possible significance of the gut microflora

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