Desempenho produtivo e perfil de ácidos graxos do leite de vacas que receberam níveis crescentes de óleo de girassol em dietas à base de capim-elefante

Ribeiro, Carlos Gustavo Santos; Lopes, F. C. F.; Gama, Marco Antônio Sundfeld da; Morenz, Mirton José Frota; Rodríguez, N. M.

doi:10.1590/1678-6886

Cited by 15 publications

(24 citation statements)

References 12 publications

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“…This hypothesis is supported by the negative correlations (r = -0.52 to -0.97, P<0.05) between the sum of the milk contents of de novo-synthesized FAs with those of several C18-unsaturated FAs (e.g., rumenic; linoleic; trans-9, cis-11 CLA; trans-9 C18:1; trans-10 C18:1; vaccenic; trans-12 C18:1; oleic; cis-11 C18:1, cis-12 C18:1 and others). The reduction in the milk contents of de novo-synthesized FAs in response to supplementation of diets with free vegetable oils is also well documented in the literature (EIFERT et al, 2006;RIBEIRO et al, 2014;LOPES et al, 2015). Comparing the control ration with the 4.5% SO ration, the reductions (P<0.0001) in the milk contents of lauric, myristic and palmitic acids were, respectively, 111%, 85% and 59%.…”

Section: Itemmentioning

confidence: 80%

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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: Itemmentioning

confidence: 80%

“…In addition, it may cause an increase in the formation of FAs intermediates of ruminal biohydrogenation, such as trans-10, cis-12 CLA (EIFERT et al, 2006) and trans-9, cis-11 CLA (RIBEIRO et al, 2014), which are associated with the inhibition of lipogenesis in the mammary gland of cows (BERNARD et al, 2008;SHINGFELD et al, 2010).…”

Section: Introductionmentioning

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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“…Samples of feeds, refusals, and feces were analyzed for DM (method 934.01) according to AOAC (2005) and ether extract (EE) according to AOCS (2004). Also, samples of diet ingredients and orts were taken and stored at -18 °C, for further fatty acid (FA) determination by the gas-phase chromatography technique (Tables 1 and 2), as described by Ribeiro et al (2014). The analysis was performed at the laboratory of chromatography of Embrapa Gado de Leite (Juiz de Fora, Minas Gerais, Brazil) using a 6890 N gas-phase chromatograph (Agilent Technologies Inc., Santa Clara, California, USA), equipped with HP-FFAP column (25 m × 0.20 m × 0.33 μm; Agilent Technologies, Santa Clara, California, USA) and flame ionization detector.…”

Section: Methodsmentioning

confidence: 99%

“…Milk samples were collected, transferred to bottles without preservatives, and stored at -18 °C, for the future determination of FA profile at the laboratory of chromatography of Embrapa Gado de Leite. This FA profile determination was performed according to the description by Ribeiro et al (2014), in a 7820 A gas-phase chromatograph (Agilent Table 2. Fatty acid (FA) composition of individual feeds.…”

Section: Methodsmentioning

confidence: 99%

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Milk fatty acid profile of dairy cows fed diets based on sugarcane bagasse in the Brazilian region

Freitas

Gama²,

Silva

et al. 2019

Chil. j. agric. res.

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Little is known about milk fatty acid (FA) profile of cows fed diets based on sugarcane (Saccharum officinarum L.) bagasse. This study aimed to evaluate FA profile and nutritional quality indexes of milk fat of cows fed sugarcane bagasse and concentrate in the Brazilian northeast semiarid region. Multiparous Girolando cows were allocated in four diets based on different levels of sugarcane bagasse (30%, 38%, 46%, and 54% total DM) added to concentrate. Fatty acids C18:1 trans-11 (lowest value for 46% inclusion) and conjugated linoleic acid (CLA) cis-9, trans-11 (lowest value for 46% inclusion) in milk fat presented a quadratic pattern (P < 0.05). This trend was also observed for C18:1 cis-9 (P < 0.05), but at a lower magnitude. There was a reduction in concentration of C18:1 trans-10 (0.320 to 0.148 g 100 g-1 total FA) and CLA trans-10, cis-12 (0.008 to 0.004 g 100 g-1 total FA) according to the levels of sugarcane bagasse increase. The greater inclusion of bagasse and consequent reduction in the proportion of concentrate, notably corn, cause an increase in concentration of medium-chain saturated FA and a linear reduction of C18:3 n-3 and C18:2 n-6, with a consequent increase in the indexes of atherogenicity (2.82 to 3.2) and thrombogenicity (3.39 to 3.84) and a decrease in ratio of hypo/ hyper-cholesterolemic (0.44 to 0.37) and ω-6:ω-3 (12.44 to 8.80) in milk fat. Results indicate that different levels of sugarcane bagasse change the FA content in cows' milk when bagasse is an exclusive roughage source in the diet. The greater inclusion of sugarcane bagasse reduces the quality of milk fat of dairy cows. The lowest level of sugarcane bagasse inclusion tested (30%) promotes greater milk yield and healthier milk fat.

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Combinations of cactus pear with different roughage sources on the production, chemical composition, and milk fatty acid profile of F1 Holstein/Zebu cows

Soares

Júnior

Monção

et al. 2020

Trop Anim Health Prod

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Desempenho produtivo e perfil de ácidos graxos do leite de vacas que receberam níveis crescentes de óleo de girassol em dietas à base de capim-elefante

Cited by 15 publications

References 12 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

Milk fatty acid profile of dairy cows fed diets based on sugarcane bagasse in the Brazilian region

Combinations of cactus pear with different roughage sources on the production, chemical composition, and milk fatty acid profile of F1 Holstein/Zebu cows

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