Digestion of proteins of varying degradability in sheep. 2. Amount and composition of the protein entering the small intestine.

Bruchem, J. van; Rouwers, S.M.G.; Bangma, G.A.; Lammers-Wienhoven, S.C.W.; Adrichem, P.W.M. van

doi:10.18174/njas.v33i3.16841

Cited by 12 publications

(13 citation statements)

References 12 publications

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“…This would be supported by the fact that wheat straw is a poor source of protein (only 36g/kgdry matter), and consequently of phenylalanine. Phenylalanine entering the small intestine was not enriched by rumen microbial synthesis (Van Bruchem et al 1985). Recycled urea-N was found to be the major source of gut N in Bedouin goats fed on wheat straw (Silanikove et al 1980).…”

Section: Ailmentioning

confidence: 85%

Lignocellulose degradation and subsequent metabolism of lignin fermentation products by the desert black Bedouin goat fed on wheat straw as a single-component diet

Silanikove

Brosh

1989

Br J Nutr

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Bedouin goats were fed on wheat straw as a single-component diet under two watering regimens, drinking once daily or once every 4 d, in order to clarify whether lignin-degradation products were absorbed, metabolized and excreted in urine. Acid-soluble lignin accounted for 220 g/kg total lignin, its digestibility was the highest (0.87) and was unaffected by water deprivation. Acid-insoluble lignin accounted for 780 g/kg total lignin and its digestibility increased during water deprivation from 0.21 to 0.41. Alkali-soluble lignin accounted for 320 g/kg total lignin and its digestibility increased during water deprivation from 0.44 to 053. Digestibility of structural carbohydrate was considerably higher than that observed in other domesticated ruminants fed on wheat straw. It responded positively to water deprivation, increasing from 0-63 to 0-73 with cellulose and from 0.61 to 0.68 with hemicellulose. The amount of urinary aromatic acids, mainly in the form of hippuric acid, considerably exceeded the potential contribution of any nonlignin component which might affect the excretion of aromatic acids. A considerable percentage (71-76) of the apparently digested lignin was not accounted for as soluble phenolic compounds in faeces or as aromatic acids in urine, and hence was apparently completely metabolized. Lignin is a key substrate which is extensively digested in goats fed on low-quality forage, with subsequent absorption of endproducts. This enhanced the availability of structural carbohydrates for fermentation and was associated with excretion of high-energy metabolites in the form of benzoic and hippuric acids.Lignin fermentation : Lignocellulose :

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Section: Ailmentioning

confidence: 85%

Lignocellulose degradation and subsequent metabolism of lignin fermentation products by the desert black Bedouin goat fed on wheat straw as a single-component diet

Silanikove

Brosh

1989

Br J Nutr

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“…The composition of the concentrates and the experimental design were as given by van Bruchem et al (1985a). The experiments were conducted, samples analysed and data statistic ally handled as described in detail by van Bruchem et al (1985b).…”

Section: Methodsmentioning

confidence: 99%

“…Digestibility may be increased by rumen incubation (Robinson & Tamminga, 1984). The proportion of dietary protein entering the small intestine under the present experimental conditions is given by van Bruchem et al (1985b). Some recent papers are available on the digestibility of microbial N in the small in testine (Tas et al, 1981;Storm et al, 1983).…”

Section: Introductionmentioning

confidence: 95%

Digestion of proteins of varying degradability in sheep. 3. Apparent and true digestibility in the small intestine and ileal endogenous flow of N and amino acids.

Bruchem¹,

Bongers²,

Walsum³

et al. 1985

NJAS

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Sugarbeet pulp, citrus pulp, sugarbeet molasses and minerals and vitamins were mixed with different amounts of groundnut expeller, potato protein, peas or dried brewers' grains to give 6 concentrates with protein solubility from 7 to 51%. The concentrates (600 g daily) were given with rye grass (300 g daily) to 2 Texel wethers with an infusion tube into the abomasum and with cannulae in the cranial duodenum and terminal ileum. Apparent digestibility of amino acid nitrogen in the small intestine was 57.0 to 73.2% and increased with increasing amounts of protein entering the small intestine. Mean true digestibility in the small intestine was 90.3%. Apparent and true digestibilities of individual amino acids varied considerably. Of protein leaving the small intestine 75% was endogenous (non-ammonia N 321 mg/kg0.75 daily). (Abstract retrieved from CAB Abstracts by CABI’s permission)

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“…An attempt was made to estimate microbial contamination according to van Bruchem et al (1985), by means of comparison of amino acid profiles of the feed, microbial protein (Rooke et al 1984) and rumen residue. The method of van Bruchem et al (1985) incorrectly assumes that the amino acid profile of feed does not change during rumen incubation and, therefore, the amino acid profile of the insoluble residue was used instead of that of the feed. Values for estimated microbial contamination were (%): 27, 0, 10, 4, 0, 5, 12, 36 and 0 of total AAN for BP, MGF, MFM, PKE, SBH, SBM, GS, MS and Cm respectively.…”

Section: Rumen Degradationmentioning

confidence: 99%

Digestion of feed amino acids in the rumen and small intestine of dairy cows measured with nylon-bag techniques

Straalen¹,

Odinga²,

Mostert³

1997

Br J Nutr

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The disappearance of total N, non-protein-N and amino acid-N after washing, rumen incubation and intestinal passage of sugarbeet pulp, maize-gluten feed, maize feed meal, palm kernel meal, soyabean hulls, soyabean meal, grass silage, maize silage and concentrate was measured in four dairy cows using nylon-bag techniques. Disappearance of amino acid-N after washing varied between feedstuff's from 14 to 69 % of feed amino acid-N, and was lower than disappearance of nonprotein-N. For sugarbeet pulp, grass silage and maize silage, washing had a considerable effect on the amino acid profile. Disappearance of amino acid-N after rumen incubation was also lower than non-protein-N and varied between feedstuff's from 25 to 73% of feed amino acid-N. Rumen incubation had only a small effect on the amino acid profile of the residue after washing. Disappearance of amino acid-N in the intestine varied between feedstuffs from 70 to 99 % of rumen undegraded amino acid-N, and was higher than the disappearance of non-protein-N. Intestinal incubation showed a considerable effect on the amino acid profile for all feedstuffs. It was concluded that protein that was assumed to escape rumen degradation and was absorbable in the intestine was higher in amino acids and methionine, and lower in non-amino acid-N and glutamic acid and proline compared with protein in the feedstuff.

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Digestion of proteins of varying degradability in sheep. 2. Amount and composition of the protein entering the small intestine.

Cited by 12 publications

References 12 publications

Lignocellulose degradation and subsequent metabolism of lignin fermentation products by the desert black Bedouin goat fed on wheat straw as a single-component diet

Lignocellulose degradation and subsequent metabolism of lignin fermentation products by the desert black Bedouin goat fed on wheat straw as a single-component diet

Digestion of proteins of varying degradability in sheep. 3. Apparent and true digestibility in the small intestine and ileal endogenous flow of N and amino acids.

Digestion of feed amino acids in the rumen and small intestine of dairy cows measured with nylon-bag techniques

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