Abstract
This study aimed to determine and measure the phenolic acids in four varieties of sugarcane (RB 855536, RB 765418, SP 80-1842 and SP 80-1816) as fresh and ensiled, and assess the influence of these acids on in situ degradability of dry matter and neutral detergent fiber. The experimental design was completely randomized in a factorial design. For the fraction of dry matter (DM), varieties RB 855536 and SP 80-1842 had average 17.80% higher compared to others. The SP80-1842 and RB 855536 varieties did not differ (p > 0.05), with an average of DM effective degradability of 33.70%. For silage, the highest levels of p-coumaric acid were found in the variety RB 855536, which was 24.64% higher than the varieties RB 765418 and SP 80-1842 (average 12.75%) and 52.60% of the variety SP 80-1816 (average 8.02%), since for the in natura form, varieties did not differ between each other (p > 0.05), and had an average of 8.86%. Silage variety SP 80-1816 has ferulic acid content 40.82% higher than the other varieties, with an average of 4.63%. The examination of the concentrations of phenolic acids p-coumaric and ferulic are not sufficient to justify the effect of microbial action on the varieties studied in different forms of processing.
Highlights
The main obstacle in the use of sugarcane (Saccharum officinarum) in ruminant diets is related to the low crude protein and fiber fraction, since it causes a reduction in consumption, mainly due to its low degradability and digestibility (Gomes et al, 2011), making this difficult to balance the diet with nutrients
The main phenolic acids related to lignification and interconnection between cell wall carbohydrates with lignin are determined by the method of highperformance liquid chromatography (HPLC) (Deschamps & Ramos, 2002)
The importance of understanding the dry matter (DM) content of varieties is inferred, superficially, on the fermentation profile, when they are processed in the form of silage
Summary
The main obstacle in the use of sugarcane (Saccharum officinarum) in ruminant diets is related to the low crude protein and fiber fraction, since it causes a reduction in consumption, mainly due to its low degradability and digestibility (Gomes et al, 2011), making this difficult to balance the diet with nutrients.The ruminal degradation of the cell wall of forage plants is closely linked to its chemicalActa Scientiarum. Among the constituents of the cell wall, lignin is considered to have the most negative effect (Van Soest, 1994; Deschamps & Ramos, 2002; Detmann et al, 2009) .understanding the concentration of lignin precursors, phenolic acids and their association with the cell wall constituent carbohydrates, hemicellulose and cellulose, is essential to understand the relevant limitations related to the fiber degradation of tropical forages. The main phenolic acids related to lignification and interconnection between cell wall carbohydrates with lignin are determined by the method of highperformance liquid chromatography (HPLC) (Deschamps & Ramos, 2002). The importance of phenolic acids in the nutrient release process, in a long term, requires a quantitative analysis method employed to determine the effect of the composition of phenolic acids in the plant constitution
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