Influence of ruminal biohydrogenation on the feeding value of fat in finishing diets for feedlot cattle.

Zinn, R. A.; Gulati, S. K.; Plascencia, A.; Salinas, J.

doi:10.2527/2000.7871738x

Cited by 98 publications

(85 citation statements)

References 36 publications

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“…Our results agree with those of Zinn et al (2000) who reported higher post-ruminal digestibility of all C 18 FA when steers were fed yellow grease. In contrast, several researchers reported reduction in post-ruminal digestibility of individual unsaturated C 18 FA as a result of soybean or canola seed supplementation (Tice et al 1994;Hussein et al 1996).…”

Section: Intakes and Flows Of Fasupporting

confidence: 92%

Feeding micronized and extruded flaxseed to dairy cows: Effects on digestion and ruminal biohydrogenation of long-chain fatty acids

Gonthier¹,

Mustafa²,

Berthiaume³

et al. 2004

Can. J. Anim. Sci.

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Four lactating Holstein cows fitted with ruminal and duodenal cannulae were used in a 4 × 4 Latin square study to determine the effects of feeding micronized and extruded flaxseed on ruminal biohydrogenation (BH) and digestibility of fatty acids (FA) in the gastrointestinal tract. Four diets were formulated: a control diet with no flaxseed (C); a raw flaxseed diet (RF); a micronized flaxseed diet (MF); and an extruded flaxseed diet (EF). Flaxseed diets contained 126 g kg -1 flaxseed (dry matter basis). Experimental periods (n = 4) consisted of 21 d of diet adaptation and 7 d of data collection. Flaxseed supplementation increased (P < 0.05) intake of individual long-chain FA, reduced (P < 0.05) ruminal BH of total unsaturated C 18 , and increased (P < 0.05) duodenal flow of individual long-chain FA except for C 18:2 . Feeding flaxseed increased (P < 0.05) post-ruminal digestibility of C 18:1 , C 18:2, and C 18:3 and total tract digestibility of C 16:0 , C 18:2, C 18:3 , and of total long-chain FA. Heat treatment had no effect on ruminal BH, duodenal flow and digestibility of unsaturated FA. Ruminal BH of C 18:3 was higher (P < 0.05), while the duodenal flow of C 18:3 was lower (P < 0.05) for cows fed EF than for those fed MF. Intake and duodenal flow of C 16:0 were higher (P < 0.05) for cows fed MF relative to those fed EF. It was concluded that inclusion of flaxseed in dairy cow diets increased duodenal flow of polyunsaturated FA. However, heat treatments were not effective in protecting unsaturated FA from ruminal BH. . Les rations contenaient 126 g de graines de lin par kg (poids de la matière sèche). Les expériences (n = 4) ont duré 21 jours pour l'adaptation au régime plus 7 jours pour la collecte des données. Le supplément de graines de lin augmente (P < 0,05) l'absorption des AG à chaîne longue, diminue (P < 0,05) la BH des C 18 insaturés et accroît (P < 0,05) le passage des AG à chaîne longue dans le duodénum sauf les C 18:2 . Les graines de lin augmentent (P < 0,05) la digestibilité des C 18:1 , des C 18:2 et des C 18:3 après leur passage dans le rumen et la digestibilité globale des C 16:0 , des C 18:2 , des C 18:3 ainsi que des AG totaux à chaîne longue dans l'ensemble du tractus. Le conditionnement thermique n'a aucune incidence sur la BH dans le rumen, sur le débit du duodénum ni sur la digestibilité des AG insaturés. Les vaches recevant du LE présentaient une meilleure BH des C 18:3 dans le rumen (P < 0,05), mais aussi un ralentissement du passage des C 18:3 dans le duodénum (P < 0,05) comparativement à celles nourries avec du LM. Le taux d'ingestion et le débit des C 16:0 dans le duodénum sont plus élevés (P < 0,05) chez les vaches nourries de LM que chez celles recevant du LE. On en conclut qu'inclure des graines de lin à la ration des vaches laitières accélère le passage des AG polyinsaturés dans le duodénum. Toutefois, le conditionnement thermique ne permet pas de protéger les AG insaturés de la BH dans le rumen. Mots clés:Lin, bio-hydrogénation dans le rumen, acides gras, conditionnement thermi...

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Section: Intakes and Flows Of Fasupporting

confidence: 92%

Feeding micronized and extruded flaxseed to dairy cows: Effects on digestion and ruminal biohydrogenation of long-chain fatty acids

Gonthier¹,

Mustafa²,

Berthiaume³

et al. 2004

Can. J. Anim. Sci.

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“…Isto também foi constatado por Ngidi et al (1990), que observaram que o uso de sais de cálcio de ácidos graxos nos níveis de 0 até 6% da matéria seca, para engorda de novilhos, não influenciou a espessura de gordura da carcaça ou a área de olho de lombo. Resultado semelhante foi observado por Zinn et al (2000), que alimentaram novilhos holandeses com dietas de sais de cálcio de ácidos graxos e gordura animal, até o nível de 6% e concluíram que estas dietas não tiveram efeito sobre a área de olho de lombo ou sobre a gordura subcutânea.…”

Section: Resultsunclassified

Desempenho e características de carcaça de novilhos alimentados com dietas contendo diferentes fontes de lipídios

et al. 2005

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RESUMO -Este trabalho foi realizado para se avaliar o desempenho animal, as características da carcaça e a maciez da carne de 36 novilhos mestiços, apresentando, ao início do experimento, média de 14 meses de idade e aproximadamente 320 kg de peso vivo. Os animais foram confinados e receberam dietas com alto teor de concentrado: uma controle (CO), sem adição de lipídios; outra contendo 5% de sais de cálcio de ácidos graxos (AG); e outra com 21% de caroço de algodão (CA). A ingestão de matéria seca no tratamento AG foi menor que no CA, mas não diferiu da ingestão do CO. O ganho médio diário e a eficiência alimentar não apresentaram diferenças significativas entre os tratamentos. Os valores encontrados para a análise de uréia sangüínea foram significativamente maiores no tratamento CA em relação ao AG. O rendimento de carcaça, a área de olho de lombo, a espessura de gordura, as gorduras renal e pélvica, o peso do fígado, o pH e a temperatura não foram significativamente diferentes. Não houve diferença também para o índice de perda de água por cozimento e maciez, verificada pela força de cisalhamento nos diferentes tempos de maturação. Os sais de cálcio de ácidos graxos a 5% e o caroço de algodão a 21% podem ser empregados nas rações para confinamento, sem causarem alterações no desempenho animal ou nas características de carcaça.Palavras-chave: características de carcaça, caroço de algodão, confinamento, espessura de gordura, rendimento de carcaça, sais de cálcio de ácidos graxos Performance and Carcass Characteristics of Steers Fed Different Fat SourcesABSTRACT -The objective of this trial was to evaluate the animal performance, carcass characteristics and meat tenderness of 36 crossbred steers averaging 14 months old and 320 kg body weight. The animals were fed high concentrate-based diets: control -without additional fat (CO); diet with 5% calcium salt of fatty acids (AG); and diet with 21% whole cottonseed (CA). Dry matter intake of AG treatment was lower (P=0,05) than CA, that differ from CO diet. No significant differences of treatments on daily weight gain and feed efficiency were observed. Blood urea nitrogen was greater (P=0,01) for CA treatment than AG treatment. Carcass dressing, rib eye area, fat thickness, kidney and pelvic fat, liver weight, pH and temperature did not show significant difference. No difference on water loss during cooking and tenderness measured by shear force at different aging times was detected. Diets with 5% calcium salt of fatty acids or 21% whole cottonseed can be used for feedlot with no change on animal performance or carcass characteristics.

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“…However, this inhibition may also be attributed to the level of dietary fat, and the optimal levels of unsaturated fatty acids in the diet are unknown. Some authors, such as Zinn et al (2000), Weiss & Pinos-Rodriguez (2009) and Hess et al (2008), report that levels higher than 50 and 60 g lipids/kg of DM in DM fat supplements affect the DM intake, while others, such as NRC (2001) Ueda et al (2003), and Harvatine & Allen (2006), report that up to 30 g lipids/kg of DM diet can be used with minimal negative effects on microbial growth and rumen function. These results indicated that the effects of unsaturated fatty acids on ruminal fermentation could be variable because of the lipid levels and basal diet composition.…”

Section: Introductionmentioning

confidence: 99%

Rumen fermentation and rumen microbes in Nellore steers receiving diets with different lipid contents

et al. 2013

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-The objective of the present study was to evaluate the effects of dietary lipid content (20, 40 and 60 g/kg dry matter) on intake, total and ruminal apparent digestibility of dry matter (DM), nutrient digestibility, rumen fermentation parameters, microbial synthesis efficiency and rumen microbial content of beef cattle. Nine cannulated steers at 6 months of age with initial body weight of 232±35 kg were used in a triplicate 3 × 3 Latin square design. The results indicated that the total intake and digestibility of DM, organic matter (OM), gross energy (GE), neutral detergent fiber (NDF) and acid detergent fiber (ADF) were not affected by the lipid content of the diet. However, the lowest lipid content diet reduced the total digestibility of crude protein (CP) and total carbohydrate linearly compared with the highest lipid diet. In contrast, when steers were fed a diet containing 20 g lipids/kg of DM, the concentration of ammonia in the rumen decreased quadratically relative to the other diets. Ruminal pH was not affected by the interaction of treatment and sampling time; however, the rumen pH decreased quadratically in animals that received the highest dietary lipid content (60 g/kg) compared with animals that received 20 and 40 g lipids/kg of DM. The rumen concentrations of volatile fatty acids, propionate, and butyrate and the acetate/propionate ratio were affected by the dietary lipid content. However, the microbial population, microbial N flow, and efficiency of synthesis were not affected by dietary lipid content. Overall, an increase in the lipid content of the diet of Nellore steers resulted in similar digestive profiles and fermentation conditions.

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Influence of ruminal biohydrogenation on the feeding value of fat in finishing diets for feedlot cattle.

Cited by 98 publications

References 36 publications

Feeding micronized and extruded flaxseed to dairy cows: Effects on digestion and ruminal biohydrogenation of long-chain fatty acids

Feeding micronized and extruded flaxseed to dairy cows: Effects on digestion and ruminal biohydrogenation of long-chain fatty acids

Desempenho e características de carcaça de novilhos alimentados com dietas contendo diferentes fontes de lipídios

Rumen fermentation and rumen microbes in Nellore steers receiving diets with different lipid contents

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