Effects of conservation method on fatty acid composition of silage

Arvidsson, Katarina; Gustavsson, Anne‐Maj; Martinsson, Κjell

doi:10.1016/j.anifeedsci.2008.04.003

Cited by 26 publications

(22 citation statements)

References 14 publications

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“…The differences could partly be because of oxidative losses of FAs during wilting, as the material was wilted overnight in the current study compared with the relatively short wilt (3 h for grass) by Vanhatalo et al (2007). However, Arvidsson et al (2009) studied the effect of ensiling and found that a wilting process shorter than 24 h did not have any substantive effect on FA composition. However, different species and even different cultivars of the same species may respond differently to different treatments.…”

Section: Discussionmentioning

confidence: 68%

The effect of N-fertilisation rate or inclusion of red clover to timothy leys on fatty acid composition in milk of dairy cows fed a commercial silage : concentrate ratio

Arvidsson

Gustavsson

Fievez

et al. 2012

Animal

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The aim of this experiment was to, under typical Swedish production conditions, evaluate the effects of grass silages subjected to different N-fertilisation regimes fed to dairy cows on the fatty acid (FA) composition of their milk, and to compare the grass silages in this respect to red clover-dominated silage. Grass silages made from first year Phleum pratense L. leys subjected to three N-fertilisation regimes (30, 90 and 120 kg N/ha, designated G-30, G-90 and G-120, respectively) and a mixed red clover-grass silage (Trifolium pratense L. and P. pratense L.; 60/40 on dry matter (DM) basis, designated RC-G) were produced. The experiment was conducted as a change-over design, including 24 primiparous and multiparous dairy cows of the Swedish Red breed, each of which was allocated to three of the four diets. The cows were offered 11 kg DM of silage and 7 kg concentrates. The silages had similar DM and energy concentrations. The CP concentration increased with increase in N-fertilisation level. There was a linear increase in DM intake of the different silages with increased N fertilisation. There were also differences in concentrations of both individual and total FAs amongst silages. The daily milk production (kg/day) did not significantly differ between treatments, but G-30 silage resulted in higher concentrations of 18:2n-6 in the milk compared with the other two grass silages. The highest concentrations of 18:3n-3 and cis-9, trans-11 18:2 were found in milk from cows offered the RC-G silage. The G-30 diet resulted in higher concentration of 18:2n-6 and the same concentration of 18:3n-3 in the milk as the other grass silages, despite lower intake levels of these FAs. The apparent recoveries of 18:3n-3 from feed to milk were 5.74%, 4.27%, 4.10% and 5.31% for G-30, G-90, G-120 and RC-G, respectively. A higher recovery when red clover is included in the diet confirms previous reports. The higher apparent recovery of 18:3n-3 on the G-30 treatment may be related to the lower silage DM intake, which led to a higher relative proportion of ingested FAs originating from concentrates compared with the G-90 and G-120 diets. With the rates and types of concentrates used in this study, the achieved differences in FA composition among the silages were not enough to influence the concentrations of unsaturated FAs in milk.

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Section: Discussionmentioning

confidence: 68%

The effect of N-fertilisation rate or inclusion of red clover to timothy leys on fatty acid composition in milk of dairy cows fed a commercial silage : concentrate ratio

Arvidsson

Gustavsson

Fievez

et al. 2012

Animal

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“…A small reduction in C18:3n-3 proportion in silages has been found earlier (Van Ranst et al, 2010). An increase in silage FA content was also reported by several authors (Arvidsson et al, 2009;Van Ranst et al, 2009a and2009b;Alves et al, 2011) and is most likely due to DM losses, leading to a relative increase in FA content when expressed on a DM basis. The lower extent of lipolysis in pure red clover silages compared with ryegrass silages is in accordance with earlier findings (Van Ranst et al, 2009a and2009b).…”

mentioning

confidence: 70%

“…A short wilting process was reported to reduce losses of PUFA Table 3 Effect of stage post-harvest (wilted and 60 days after ensiling) and RG/RC ratio on methane production, VFA production and composition of the rumen fluid after 24 h of in vitro batch incubation (n 5 3) (Dewhurst and King, 1998). Furthermore, not all authors found a reduction in PUFA content of forages during wilting (Arvidsson et al, 2009). A small reduction in C18:3n-3 proportion in silages has been found earlier (Van Ranst et al, 2010).…”

mentioning

confidence: 99%

Lipid metabolism in mixtures of red clover (Trifolium repens) and perennial ryegrass (Lolium perenne) in lab scale silages and in vitro rumen incubations

Ranst

Vandewalle²,

Gadeyne

et al. 2013

Animal

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Most often, farmers consider red clover an unattractive forage because of its low ensilability. Nevertheless, several in vivo and in vitro experiments also showed advantages of red clover silages such as decreased rumen biohydrogenation of polyunsaturated fatty acids. This has been attributed to a possible protective role of protein-bound phenols, with polyphenol oxidase playing a key role in their formation. This enzyme is active in red clover, but not in other green forages, such as, for example, perennial ryegrass. Therefore, the aim was to study the lipid metabolism within red clover/ryegrass mixtures in lab scale silages and during in vitro rumen batch incubations. Ensilability of red clover increased with higher proportions of ryegrass in the silage mixture. However, the lipid-protecting mechanism of red clover does not seem to occur in the co-ensiled ryegrass as lipolysis of polar lipids linearly increased with increasing proportions of ryegrass (86.0%, 91.6%, 89.9%, 93.1% and 95.6% in 60-day-old silages with 100/0, 75/25, 50/50, 25/75 and 0/100 red clover/ryegrass, respectively). Rumen lipolysis and biohydrogenation of C18:3n-3 and C18:2n-6 were negatively related to red clover proportions in the silage mixtures. The lipid-protective mechanism in red clover silages is confirmed, but it seems not to be transferred to lipids in co-ensiled forages.Keywords: lipid metabolism, red clover, in vitro rumen, silage ImplicationsLipids in red clover silages are less degraded as compared with lipids in ryegrass silages, which have been attributed to a lipid-protective mechanism in red clover. This implicates that less oilseeds would be required to reach milk with a healthier fatty acid profile when feeding red clover instead of ryegrass silages. However, the lipid protection is not transferred to grass lipids in mixed grass-red clover silages.

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“…The detrimental effects of prolonged wilting and field drying on the content of both total FAs and PUFAs were proved by further studies (Boufaied et al, 2003a;Shingfield et al, 2005b;Lee et al, 2006;Van Ranst et al, 2009a,b). Nevertheless, in a report of Arvidsson et al (2009), wilting of timothy shorter than 24 h did not affect the FA composition.…”

Section: Changes During Wilting and Dryingmentioning

confidence: 99%

The effects of feeding various forages on fatty acid composition of bovine milk fat: A review

Kalač¹,

Samková²

2010

Czech J. Anim. Sci.

153

128

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List of abbreviations ABSTRACT:The nutritional image of bovine milk fat has suffered for years because of the association of saturated fatty acids and coronary heart disease. Thus the alteration of fatty acid composition has been a long-term strategy. Forages, even though containing a relatively low level of lipids, are the cheapest and often the major source of beneficial unsaturated fatty acids in ruminant diets. Recent progress in the research of factors affecting fatty acid content and composition in fresh and preserved forages and the associations between feeding such forages and milk fat profile are reviewed. Milk from cows grazed or fed fresh forage, especially from species-rich grasslands or forage legumes, has a considerably higher ratio of unsaturated to saturated fatty acids and a higher content of nutritionally beneficial trans-fatty acids (e.g. CLA, vaccenic acid) than milk from cows fed silage or hay. Grass and legume silages seem to affect the fatty acid profile more propitiously than maize silage.

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Effects of conservation method on fatty acid composition of silage

Cited by 26 publications

References 14 publications

The effect of N-fertilisation rate or inclusion of red clover to timothy leys on fatty acid composition in milk of dairy cows fed a commercial silage : concentrate ratio

The effect of N-fertilisation rate or inclusion of red clover to timothy leys on fatty acid composition in milk of dairy cows fed a commercial silage : concentrate ratio

Lipid metabolism in mixtures of red clover (Trifolium repens) and perennial ryegrass (Lolium perenne) in lab scale silages and in vitro rumen incubations

The effects of feeding various forages on fatty acid composition of bovine milk fat: A review

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