Protection Des Protéines Alimentaires Contre La Désamination Bactérienne Dans Le Rumen. I. — Études in Vitro : Comportement en Milieu De Rumen De Quelques Protéines Tannées Avec Du Tanin De Châtaignier Ou Certains Aldéhydes (Formaldéhyde, Glutaraldéhyde, Glyoxal)

Zelter, S. Z.; Leroy, Françoise; Tissier, Jean‐Pierre; Naville, Marguerite

doi:10.1051/rnd:19700110

Cited by 36 publications

(7 citation statements)

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“…Formaldehyde can be used as a complex with urea to lower the rate of urea degradation in the rumen (Lall et al 1982, Setälä andSyrjälä-Qvist 1982a, b). Formaldehyde can also be used to protect dietary protein from ruminai degradation (Ferguson et al 1967, Zelter et al 1970. This process, applied to soybean oil-meal, increases by 50-90% the flow of dietary amino acids in the intestine of adult ruminants (Vérité et al 1977) and is commercially developed in Europe (Delort-Laval 1985).…”

Section: Introductionmentioning

confidence: 98%

Formaldehyde content of milk in goats fed formaldehyde‐treated soybean oil‐meal

Barry¹,

Tomé

1991

Food Additives and Contaminants

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Formaldehyde is used in ruminant feeding for different purposes including the protection of dietary proteins from ruminal degradation. The formaldehyde content of milk of goats fed various levels of formaldehyde-treated soybean oil-meal has been determined by using a sensitive HPLC method. Results showed a significant linear correlation between ingested formaldehyde and formaldehyde concentration in milk. About 0.02% of ingested formaldehyde was excreted in milk, as free formaldehyde.

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Section: Introductionmentioning

confidence: 98%

Formaldehyde content of milk in goats fed formaldehyde‐treated soybean oil‐meal

Barry¹,

Tomé

1991

Food Additives and Contaminants

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“…The growing use and economic advantage of using non-protein nitrogen (NPN) compounds in ruminant diets requires that any new system should be capable of predicting their value in a variety of situations. Current developments in the protection of proteins by reaction with aldehydes or tannins (Ferguson, Hemsley & Reis, 1967;Zelter, Leroy & Tissier, 1970;Faichney & Lloyd Davies, 1972) and the encapsulation of amino acids (Neudoerffer, Duncan & Horney, 1971) require precise evaluation, not only of the products themselves but also of accompanying feedstuffs, if their potential value is to be fully exploited.…”

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confidence: 99%

Evaluation of foods as sources of nitrogen and amino acids

Miller

1973

Proc. Nutr. Soc.

107

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“…The process serves to upgrade dietary protein of low biological value into microbial protein of reasonably good biological value (McNaught, Owen, Henry & Kon, 1954;Bergen, Purser & Cline, 1967) but clearly the degradation of feed protein of high biological value is disadvantageous. This latter consideration has led to many attempts to 'protect' certain dietary proteins from ruminal degradation by a variety of chemical and physical techniques (see (Chalmers, Cuthbertson & Synge, 1954 Zelter, Leroy & Tissier, 1970), and the treatment of casein with formaldehyde has proved particularly useful (Ferguson, Hemsley & Reis, 1967;Reis & Tunks, 1969). The effectiveness of these procedures may be assessed direct by measuring the amounts of feed protein reaching the duodenum in animals prepared with duodenal fistulas, but in only a few instances has it proved possible to assay feed protein in the digesta.…”

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confidence: 99%

Measurement of the bacterial nitrogen entering the duodenum of the ruminant using diaminopimelic acid as a marker

1971

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I .A technique for the separation and colorimetric estimation of z,4-diaminopimelic acid (DAP) using automated ion-exchange chromatography coupled with an acid ninhydrin detection system is described.2. Only traces of DAP were found in rumen protozoa and no DAP was detected in rumen fluid prepared by ultracentrifugation or dialysis.3. The concentration of DAP in rumen bacteria from sheep on a constant feeding regimen, and the ratio of nitrogen to DAP for these bacteria were found to be constant over a 3-month period.4. The method has proved suitable for the estimation of bacterial N in the duodenal digesta of ruminants.5. The contribution of bacterial N to the total N leaving the abomasum of a lactating cow fitted with a permanent re-entrant cannula in the duodenum was found to be 5 0 % .In ruminants a substantial proportion of dietary protein is fermented in the rumen, and the degradation products are utilized for microbial protein synthesis. The protein which becomes available for digestion and absorption beyond the rumen includes unchanged feed protein and microbial protein. ) and may be used to estimate the bacterial contribution to ruminal and duodenal nitrogenous constituents. This paper describes. an improved method for estimating DAP using ion-exchange chromatography and an acid ninhydrin reagent based on the procedure of el-Shazly & Hungate (1966). The method has been used to assess the daily contribution of bacterial N to the total N passing into the duodenum of a lactating dairy cow. K. HUTTON, F. J. BAILEY AND E. F. ANNISON M A T E R I A L S A N D M E T H O D S Experimental animalsA mature Clun Forest wether with a rumen fistula, given I kg hay and IOO g rolled oats once daily, was used as a source of rumen bacteria when samples were required to assess the variation in N : DAP ratio over a 3-month period for an animal on a constant feeding regimen.A 4-year-old lactating Ayrshire cow in the 8th month of lactation and yielding 8.3 kg of milk daily was used for the estimation of bacterial N entering the duodenum. This animal had a rumen fistula and a re-entrant cannula in the proximal duodenum about 7 cm from the pyloric sphincter. The maintenance requirement of the cow was supplied by barley straw and a protein balancer offered at 11.00 and 17.00 hours. Production concentrates (400 g/kg milk) were given at 7.00 and 16.00 hours. The total intake of nutrients was slightly in excess of the minimum requirements recommended by the Agricultural Research Council (1965). Paper impregnated with chromic oxide (72.2 g chromic oxide/zoo g paper) was added to the rumen of the cow once daily as a marker in the measurement of digesta flow. Collection and preparation of digestaRumen contents were strained through four layers of surgical gauze, and about 400 ml of strained liquor were centrifuged at IOO g for I min to remove protozoa and dense food particles, and to yield a bacteria-rich supernatant fluid. This bacterial fraction was centrifuged at 22 ooo g for 10 min to yield clarified rumen liquor (CRL) and a precipi...

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Protection Des Protéines Alimentaires Contre La Désamination Bactérienne Dans Le Rumen. I. — Études in Vitro : Comportement en Milieu De Rumen De Quelques Protéines Tannées Avec Du Tanin De Châtaignier Ou Certains Aldéhydes (Formaldéhyde, Glutaraldéhyde, Glyoxal)

Cited by 36 publications

References 0 publications

Formaldehyde content of milk in goats fed formaldehyde‐treated soybean oil‐meal

Formaldehyde content of milk in goats fed formaldehyde‐treated soybean oil‐meal

Evaluation of foods as sources of nitrogen and amino acids

Measurement of the bacterial nitrogen entering the duodenum of the ruminant using diaminopimelic acid as a marker

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