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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: |
10/05/2023 |
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Autoria: |
HUME, I. D. |
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Título: |
The proportion of dietary protein escaping degradation in the rumen of sheep fed on various protein concentrates. |
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Ano de publicação: |
1974 |
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Fonte/Imprenta: |
Australian Journal of Agricultural Research, v. 25, n. 1, p. 155-165, 1974. |
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DOI: |
https://doi.org/10.1071/AR9740155 |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract: The 35S content of ruminal microbial protein following intraruminal infusions of Na235SO4 was used to estimate the relative proportions of microbial and dietary protein in the duodenal digesta of sheep, and hence the proportion of the dietary protein which escaped microbial proteolysis in the rumen. When sheep were given a protein-free diet, the mean ratio of the specific activities of the sulphuramino acids in the duodenal microbial fraction (M) and the unfractionated duodenal digesta (D) was 0.97 ± 0.08 and 1.00 ± 0.06 in two separate experiments. When zein was included in the diet the ratio M/D increased to 2.35 ± 0.14, which indicated that 44 ± 3.4% of nitrogen in the duodenum was microbial. When casein was offered, the ratio M/D was 1.12 ± 0.05, which indicated that 91 ± 6.7% of duodenal nitrogen was microbial. When sheep were offered a partially purified diet containing fish meal, lupin meal, peanut meal or soya bean meal, the ratio MID indicated that 29, 65, 63 and 39% of the fish meal, lupin meal, peanut meal and soya bean meal, respectively, was degraded in the rumen; rumen ammonia levels (mg nitrogen/100 ml fluid) were 8.3, 20.9, 16.0 and 6.5, and nitrogen balances were 5.0, 2.4, 2.9 and 5.4 g/day respectively. The 35S-incorporation technique appears to provide realistic estimates of the proportions of dietary proteins which escape degradation in the rumen. |
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Palavras-Chave: |
Nutricao proteica. |
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Thesagro: |
Concentrado Protéico; Ovino; Rúmen. |
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Thesaurus Nal: |
Dietary protein; Protein concentrates; Proteolysis; Ruminant nutrition; Sheep. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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Marc: |
LEADER 02164naa a2200241 a 4500
001 1522172
005 2023-05-10
008 1974 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1071/AR9740155$2DOI
100 1 $aHUME, I. D.
245 $aThe proportion of dietary protein escaping degradation in the rumen of sheep fed on various protein concentrates.$h[electronic resource]
260 $c1974
520 $aAbstract: The 35S content of ruminal microbial protein following intraruminal infusions of Na235SO4 was used to estimate the relative proportions of microbial and dietary protein in the duodenal digesta of sheep, and hence the proportion of the dietary protein which escaped microbial proteolysis in the rumen. When sheep were given a protein-free diet, the mean ratio of the specific activities of the sulphuramino acids in the duodenal microbial fraction (M) and the unfractionated duodenal digesta (D) was 0.97 ± 0.08 and 1.00 ± 0.06 in two separate experiments. When zein was included in the diet the ratio M/D increased to 2.35 ± 0.14, which indicated that 44 ± 3.4% of nitrogen in the duodenum was microbial. When casein was offered, the ratio M/D was 1.12 ± 0.05, which indicated that 91 ± 6.7% of duodenal nitrogen was microbial. When sheep were offered a partially purified diet containing fish meal, lupin meal, peanut meal or soya bean meal, the ratio MID indicated that 29, 65, 63 and 39% of the fish meal, lupin meal, peanut meal and soya bean meal, respectively, was degraded in the rumen; rumen ammonia levels (mg nitrogen/100 ml fluid) were 8.3, 20.9, 16.0 and 6.5, and nitrogen balances were 5.0, 2.4, 2.9 and 5.4 g/day respectively. The 35S-incorporation technique appears to provide realistic estimates of the proportions of dietary proteins which escape degradation in the rumen.
650 $aDietary protein
650 $aProtein concentrates
650 $aProteolysis
650 $aRuminant nutrition
650 $aSheep
650 $aConcentrado Protéico
650 $aOvino
650 $aRúmen
653 $aNutricao proteica
773 $tAustralian Journal of Agricultural Research$gv. 25, n. 1, p. 155-165, 1974.
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