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Registro Completo |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
04/11/2015 |
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Data da última atualização: |
09/07/2024 |
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Autoria: |
WANDERLEY, R. da C.; THEURER, C. B.; POORE, M. |
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Afiliação: |
UNIVERSITY OF ARIZONA; C. BRENT THEURER; MATTHEW POORE. |
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Título: |
Duodenal bacterial and nonbactaserial and nonbacterial protein supply in steers fed forage and grain diets. |
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Ano de publicação: |
1987 |
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Fonte/Imprenta: |
Journal of Animal Science, v. 64, n. 1, p. 295-302, 1987. |
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Volume: |
v.64 |
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Páginas: |
p.295 |
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DOI: |
doi:10.2134/jas1987.641295x |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract: Four beef steers (avg wt 300 kg) fitted with duodenal re-entrant cannulae were used to study the effect of dietary concentrate to forage ratio on bacterial and nonbacterial N flow in the duodenum. According to a change-over design, the steers were designated to receive an all forage (83% alfalfa hay and 17% wheat straw) and an 80% sorghum grain diet. Lignin (ADL) and chromium oxide (Cr2O3) ratio techniques were compared with automated total collection (ATC) of digesta for quantitating duodenal protein flow and efficiency of bacterial N yield in the ramen. Estimates of bacterial protein synthesis and ruminal escape of feed protein based on Cr2O3 and lignin tended to be higher by 8 to 16% than those obtained by ATC. Efficiency of ruminal bacterial protein yield estimated by these two markers tended to be greater than that based on ATC (16 vs 12 g of bacterial protein/100 gruminal true digestion of dry matter corrected for bacterial cell synthesis). Efficiency values did not differ between diets. Crude protein flow into the duodenum was about 33% greater (P<.01) for the grain than the forage diet, although protein intake was about 10% less on the grain diet. Duodenal bacterial protein, rather than feed protein escaping ruminal degradation, accounted for most of this difference. Average duodenal flow of N, expressed as g/Mcal metabolizable energy (ME) intake, was 11.9 for the forage diet and 10.3 for the grain diet. Grams of duodenal bacterial N per Mcal ME intake were similar (P>.10) for the diets (5.1 vs 5.0), but duodenal nonbacterial N (g/Mcal ME intake) was greater (P<.01) for the forage than the grain diet (6.9 vs 5.3). With the grain diet, microbial N production exceeded the amount of feed N degraded in the rumen, presumably by utilizing extensive amounts of recycled N for ruminal bacterial synthesis. Recycled N may be of greater magnitude in grain than forage diets. Dietary concentrate to forage ratios showed a marked effect on ruminal protein digestion and duodenal flow of protein. MenosAbstract: Four beef steers (avg wt 300 kg) fitted with duodenal re-entrant cannulae were used to study the effect of dietary concentrate to forage ratio on bacterial and nonbacterial N flow in the duodenum. According to a change-over design, the steers were designated to receive an all forage (83% alfalfa hay and 17% wheat straw) and an 80% sorghum grain diet. Lignin (ADL) and chromium oxide (Cr2O3) ratio techniques were compared with automated total collection (ATC) of digesta for quantitating duodenal protein flow and efficiency of bacterial N yield in the ramen. Estimates of bacterial protein synthesis and ruminal escape of feed protein based on Cr2O3 and lignin tended to be higher by 8 to 16% than those obtained by ATC. Efficiency of ruminal bacterial protein yield estimated by these two markers tended to be greater than that based on ATC (16 vs 12 g of bacterial protein/100 gruminal true digestion of dry matter corrected for bacterial cell synthesis). Efficiency values did not differ between diets. Crude protein flow into the duodenum was about 33% greater (P<.01) for the grain than the forage diet, although protein intake was about 10% less on the grain diet. Duodenal bacterial protein, rather than feed protein escaping ruminal degradation, accounted for most of this difference. Average duodenal flow of N, expressed as g/Mcal metabolizable energy (ME) intake, was 11.9 for the forage diet and 10.3 for the grain diet. Grams of duodenal bacterial N per Mcal ME intake were... Mostrar Tudo |
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Palavras-Chave: |
Microbial protein; Protein digestion. |
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Thesaurus Nal: |
concentrates; duodenum; forage. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02730naa a2200241 a 4500
001 2027873
005 2024-07-09
008 1987 bl uuuu u00u1 u #d
024 7 $adoi:10.2134/jas1987.641295x$2DOI
100 1 $aWANDERLEY, R. da C.
245 $aDuodenal bacterial and nonbactaserial and nonbacterial protein supply in steers fed forage and grain diets.
260 $c1987
300 $ap.295 v.64
490 $vv.64
520 $aAbstract: Four beef steers (avg wt 300 kg) fitted with duodenal re-entrant cannulae were used to study the effect of dietary concentrate to forage ratio on bacterial and nonbacterial N flow in the duodenum. According to a change-over design, the steers were designated to receive an all forage (83% alfalfa hay and 17% wheat straw) and an 80% sorghum grain diet. Lignin (ADL) and chromium oxide (Cr2O3) ratio techniques were compared with automated total collection (ATC) of digesta for quantitating duodenal protein flow and efficiency of bacterial N yield in the ramen. Estimates of bacterial protein synthesis and ruminal escape of feed protein based on Cr2O3 and lignin tended to be higher by 8 to 16% than those obtained by ATC. Efficiency of ruminal bacterial protein yield estimated by these two markers tended to be greater than that based on ATC (16 vs 12 g of bacterial protein/100 gruminal true digestion of dry matter corrected for bacterial cell synthesis). Efficiency values did not differ between diets. Crude protein flow into the duodenum was about 33% greater (P<.01) for the grain than the forage diet, although protein intake was about 10% less on the grain diet. Duodenal bacterial protein, rather than feed protein escaping ruminal degradation, accounted for most of this difference. Average duodenal flow of N, expressed as g/Mcal metabolizable energy (ME) intake, was 11.9 for the forage diet and 10.3 for the grain diet. Grams of duodenal bacterial N per Mcal ME intake were similar (P>.10) for the diets (5.1 vs 5.0), but duodenal nonbacterial N (g/Mcal ME intake) was greater (P<.01) for the forage than the grain diet (6.9 vs 5.3). With the grain diet, microbial N production exceeded the amount of feed N degraded in the rumen, presumably by utilizing extensive amounts of recycled N for ruminal bacterial synthesis. Recycled N may be of greater magnitude in grain than forage diets. Dietary concentrate to forage ratios showed a marked effect on ruminal protein digestion and duodenal flow of protein.
650 $aconcentrates
650 $aduodenum
650 $aforage
653 $aMicrobial protein
653 $aProtein digestion
700 1 $aTHEURER, C. B.
700 1 $aPOORE, M.
773 $tJournal of Animal Science$gv. 64, n. 1, p. 295-302, 1987.
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