Modelagem comparativa da cinética da fase sólida do capim-elefante picado, suplementado ou não com concentrados, e fornecido a vacas Holandês x Zebu em lactação

Lopes, Fernando César Ferraz; Oliveira, Jackson Silva e; Paciullo, Domingos Sávio Campos; Aroeira, Luiz Januário Magalhães; Deresz, F.; Morenz, Mirton José Frota; Duque, Anna Carolynne Alvim; Elyas, Ana Cristina Wyllie

doi:10.1590/s0102-09352008000300023

Cited by 2 publications

(3 citation statements)

References 13 publications

(28 reference statements)

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“…In a study carried out with lactating cows that were fed corn silage-based diets, Bettero et al (2013) also did not observe an effect of the inclusion of 2% SO in the diet on the particulate passage rate in the rumen. In general, as presented in Table 5 and corroborating the results reported by Lopes et al (2008), the ruminal and post-ruminal particulate passage rates obtained from the adjustment of the fecal chromium excretion data to the Grovum and Williams (1973) model were, respectively, higher and lower than those estimated from the Dhanoa et al (1985) model. According to Ellis et al (1994), estimates of similar ruminal (k 1 ) and post-ruminal (k 2 ) passage rates (k 1 ≅ k 2 ) are inconsistent with the assumptions related to two-compartment models, and based on this, they have recommended that the ratio between these two parameters (k 2 ÷ k 1 ) should exceed the value of 1.5 to obtain a reliable estimate of the passage rate.…”

Section: Itemsupporting

confidence: 88%

“…According to Ellis et al (1994), estimates of similar ruminal (k 1 ) and post-ruminal (k 2 ) passage rates (k 1 ≅ k 2 ) are inconsistent with the assumptions related to two-compartment models, and based on this, they have recommended that the ratio between these two parameters (k 2 ÷ k 1 ) should exceed the value of 1.5 to obtain a reliable estimate of the passage rate. This recommendation allowed for Lopes et al (2008) to conclude that the process of time-dependence implicit in the multicompartmental model promoted a better adjustment of the fecal excretion data. These authors, who worked with lactating Holstein x Zebu cows fed chopped elephantgrass supplemented with non-lipid concentrate, reported ruminal and post-ruminal particulate passage rates, estimated from the model of Dhanoa et al (1985), respectively, from 2.61 to 2.97% h -1 and from 8.17 to 10.94% h -1 , that is, close to those obtained in the present study (Table 5).…”

Section: Itemmentioning

confidence: 99%

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Ruminal fermentation and degradation, kinetic flow of the digesta and milk fatty acid composition of cows fed chopped elephantgrass supplemented with soybean oil

Ribeiro

Lopes

Rodríguez

et al. 2018

SCA

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Ruminal fermentation and degradation, kinetic flow of the digesta and milk fatty acid composition of cows fed chopped elephantgrass supplemented with soybean oil Fermentação e degradação ruminal, cinética de fluxo da digesta e perfil de ácidos graxos do leite de vacas alimentadas com capimelefante picado suplementado com óleo de soja AbstractThe aim of this study was to evaluate the ruminal parameters of fermentation and degradation, kinetic flow of rumen digesta, and milk fatty acid composition of cows fed 52% chopped elephantgrass-based diets containing 0.0% (control), 1.5%, 3.0% and 4.5% soybean oil (SO) on a dry matter (DM) basis. Four rumen-cannulated Holstein x Gyr dairy cows with an average milk production of 15.6 ± 3.0 kg day -1 and 90 ± 25 days in milk were allocated in a 4 x 4 Latin square design. The results were analyzed by mixed models. Significant differences were declared at P≤0.05, and P-values from 0.05 < P ≤ 0.10 were considered as a trend. The inclusion of SO in the diet had no effect on the ruminal pH or total volatile fatty acid concentration, but there was a quadratic effect on the ruminal ammonia nitrogen content and a trend for a linear reduction (P=0.07) in the molar proportion of rumen acetate. Linear reductions were also observed in the DM and neutral detergent fiber (NDF) effective degradabilities of elephantgrass forage, but the fluid and particulate passage rates in the rumen and the DM and NDF intakes were unchanged by SO inclusion in the diet. Milk production, protein and lactose contents and yields were unaltered by dietary SO levels. There were linear reductions in the milk fat and total solids contents, but there was no effect of dietary treatments on their yields. The inclusion of soybean oil in the diet of Holstein x Gyr cows fed chopped elephantgrass improved the nutritional quality of milk fat as a result of increased contents of oleic, rumenic and vaccenic acids, which are beneficial to human health, and a concomitant reduction in hypercholesterolemic saturated fatty acids such as lauric, myristic and palmitic acids. ResumoO objetivo deste estudo foi avaliar os parâmetros de fermentação e degradação ruminal, a cinética de fluxo da digesta, e o perfil de ácidos graxos (AG) do leite de vacas alimentadas com 52% de capimelefante picado e inclusão de 0,0 (controle), 1,5, 3,0 e 4,5% de óleo de soja (OS) na matéria seca (MS) da dieta. Foram utilizadas quatro vacas Holandês x Gir com 90 ± 25 dias em lactação, produzindo 15,6 ± 3,0 kg dia -1 de leite, canuladas no rúmen, e alocadas em delineamento Quadrado Latino 4 x 4. Os resultados foram analisados por modelos mistos. Efeitos foram considerados significativos quando P <0,05, enquanto valores de P entre 0,05 e 0,10 foram considerados indicativos de tendência. A inclusão de OS na dieta não alterou o pH do rúmen, nem a concentração total de ácidos graxos voláteis, mas promoveu efeito quadrático sobre a concentração de N amoniacal, e tendência de redução linear (P=0,07) sobre a proporção molar de acetato. Foram observadas reduções...

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Section: Itemsupporting

confidence: 88%

Section: Itemmentioning

confidence: 99%

Ruminal fermentation and degradation, kinetic flow of the digesta and milk fatty acid composition of cows fed chopped elephantgrass supplemented with soybean oil

Ribeiro

Lopes

Rodríguez

et al. 2018

SCA

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“…The average value presented by Bettero et al (2013) was 3.6% h -1 , which is close to the values estimated mainly through the Grovum and Williams (1973) model (Table 5). Corroborating the results reported by Lopes et al (2008) and Ribeiro et al (2018), the ruminal and postruminal particulate passage rates obtained from the adjustment of the fecal chromium excretion data to the Grovum and Williams (1973) model were, respectively, higher and lower than those estimated from the Dhanoa et al (1985) model.…”

Section: Discussionsupporting

confidence: 69%

Ruminal fermentation and degradation, kinetic flow of digesta and milk fatty acid composition of cows fed sugarcane silage-based diets supplemented with whole cottonseed

Costa

Lopes

Rebouças

et al. 2020

SCA

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The aim of this study was to evaluate the ruminal fermentation and degradation parameters, the kinetic flow of digesta in the gastrointestinal tract, and the milk fatty acid (FA) profile in Holstein x Gyr cows fed 59% sugarcane silage-based diets with 0% (control), 5%, 10% and 15% whole cottonseed (WCS) on a dry matter (DM) basis. Four rumen-cannulated cows with an average milk yield of 14.4±3.3 kg day-1 and 85±25 days in milk were allocated in a 4 x 4 Latin square design. There was no effect of dietary WCS levels on the intake of organic matter (OM), crude protein (CP), neutral detergent fiber (NDF) and nonfibrous carbohydrates, but there was a linear increase in the intake of ether extract (EE). There was no treatment effect on the apparent digestibility of DM, OM, CP, EE and NDF or on the ruminal degradability parameters for DM and NDF of sugarcane silage. Also, no treatment effects were observed on rumen pH, ruminal and postruminal particulate passage rates or on the rate of passage of the fluids in the rumen. WCS promoted linear reductions in the milk fat contents of lauric, myristic and palmitic acids and linear increases in the milk fat contents of stearic, oleic, trans-10 C18:1 and elaidic acids. The milk fat contents of vaccenic, rumenic, linoleic and ?-linolenic acids were unaffected by WCS supplementation. The inclusion of up to 15% WCS in sugarcane silage-based diets did not alter the digestibility of nutrients, the rumen degradability of the fiber, or the kinetic flow of digesta in the gastrointestinal tract of Holstein x Gyr cows but improved the nutritional quality of milk fat through an increase in the content of oleic acid, which is beneficial to human health, and decreased levels of hypercholesterolemic lauric, myristic and palmitic acids.

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Modelagem comparativa da cinética da fase sólida do capim-elefante picado, suplementado ou não com concentrados, e fornecido a vacas Holandês x Zebu em lactação

Cited by 2 publications

References 13 publications

Ruminal fermentation and degradation, kinetic flow of the digesta and milk fatty acid composition of cows fed chopped elephantgrass supplemented with soybean oil

Ruminal fermentation and degradation, kinetic flow of the digesta and milk fatty acid composition of cows fed chopped elephantgrass supplemented with soybean oil

Ruminal fermentation and degradation, kinetic flow of digesta and milk fatty acid composition of cows fed sugarcane silage-based diets supplemented with whole cottonseed

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