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 | Acesso ao texto completo restrito à biblioteca da Embrapa Caprinos e Ovinos. Para informações adicionais entre em contato com cnpc.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
01/08/1992 |
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Data da última atualização: |
20/06/2023 |
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Autoria: |
SATTER, L. D.; SLYTER, L. L. |
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Título: |
Effect of ammonia concentration on rumen microbial protein production in vitro. |
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Ano de publicação: |
1974 |
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Fonte/Imprenta: |
British Journal of Nutrition, v. 32, n. 2, p. 199-208, Sep. 1974. |
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DOI: |
https://doi.org/10.1079/BJN19740073 |
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Idioma: |
Inglês |
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Conteúdo: |
1. The effect of ammonia concentration on microbial protein production was determined in continuous-culture fermentors charged with ruminal contents obtained from steers fed on either a protein-free purified diet, a maize-based all-concentrate diet, or a forage?concentrate (23:77) diet. Urea was infused into the fermentors to maintain various concentrations of ammonia in the incubating mixtures. 2. Under nitrogen-limiting conditions, microbial protein yield measured as tungstic acid-precipitable N (TAPN) increased linearly with supplementary urea until ammonia started to accumulate in the incubating ingesta. Increasing the ammonia concentration beyond 50 mg NH3-N/l had no effect on microbial protein production. 3. The molar proportions of volatile acids produced were not affected by the level of urea supplementation. Total acid production was decreased slightly under N-limiting conditions, but not to the same extent as microbial protein production. 4. Estimated yield of microbial dry matter/mol ATP produced averaged 15·6 when non-limiting N as urea was provided with the purified diet. 5. These results suggest that addition of non-protein N supplements to ruminant rations are warranted only if the prevailing concentration of ruminal ammonia is less than 50 mg NH3-N/l ruminal fluid. |
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Palavras-Chave: |
Nutricao Proteica. |
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Thesagro: |
Ruminante. |
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Thesaurus Nal: |
Ammonia; In vitro digestibility; Microbial proteins; Ruminant nutrition; Volatile fatty acids. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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Marc: |
LEADER 02010naa a2200229 a 4500
001 1520034
005 2023-06-20
008 1974 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1079/BJN19740073$2DOI
100 1 $aSATTER, L. D.
245 $aEffect of ammonia concentration on rumen microbial protein production in vitro.$h[electronic resource]
260 $c1974
520 $a1. The effect of ammonia concentration on microbial protein production was determined in continuous-culture fermentors charged with ruminal contents obtained from steers fed on either a protein-free purified diet, a maize-based all-concentrate diet, or a forage?concentrate (23:77) diet. Urea was infused into the fermentors to maintain various concentrations of ammonia in the incubating mixtures. 2. Under nitrogen-limiting conditions, microbial protein yield measured as tungstic acid-precipitable N (TAPN) increased linearly with supplementary urea until ammonia started to accumulate in the incubating ingesta. Increasing the ammonia concentration beyond 50 mg NH3-N/l had no effect on microbial protein production. 3. The molar proportions of volatile acids produced were not affected by the level of urea supplementation. Total acid production was decreased slightly under N-limiting conditions, but not to the same extent as microbial protein production. 4. Estimated yield of microbial dry matter/mol ATP produced averaged 15·6 when non-limiting N as urea was provided with the purified diet. 5. These results suggest that addition of non-protein N supplements to ruminant rations are warranted only if the prevailing concentration of ruminal ammonia is less than 50 mg NH3-N/l ruminal fluid.
650 $aAmmonia
650 $aIn vitro digestibility
650 $aMicrobial proteins
650 $aRuminant nutrition
650 $aVolatile fatty acids
650 $aRuminante
653 $aNutricao Proteica
700 1 $aSLYTER, L. L.
773 $tBritish Journal of Nutrition$gv. 32, n. 2, p. 199-208, Sep. 1974.
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| 1. |  | YUAN, S.; LINQUIST, B. A.; WILSON, L. T.; CASSMAN, K. G.; STUART, A. M.; PEDE, V.; MIRO, B.; SAITO, K.; AGUSTIANI, N.; ARISTYA, V. E.; KRISNADI, L. Y.; ZANON, A. J.; HEINEMANN, A. B.; CARRACELAS, G.; SUBASH, N.; BRAHMANAND, P. S.; LI, T.; PENG, S.; GRASSINI, P. Sustainable intensification for a larger global rice bowl. Nature Communications, v. 12, 7163, Dec. 2021.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 1 |
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