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- W2065105440 abstract "Abstract The objective was to evaluate the ability of in situ and in vitro gas production methods in determining the variation in grass and grass silage organic matter digestibility (OMD) compared to in vitro pepsin–cellulase solubility, which was considered as a reference method. The variation in OMD was obtained by varying grass species, stage of maturity at harvest and preservation method (dried vs. ensiled). Five grass species ( Dactylis glomerata , Phleum pratense , Lolium perenne , Festuca arundinacea and Lolium multiflorum × Festuca arundinacea ) harvested from primary growth at four dates in 2005 were analyzed for chemical composition and OMD using in vitro pepsin–cellulase solubility (OMD PC ), in vitro gas production (OMD GP ) and three in situ methods. When using the in situ methods, the OMD was derived from traditional sequential nylon bag incubations and calculated using one-compartment or two-compartment models (OMD IS1 and OMD IS2 , respectively), or from indigestible neutral detergent fibre (iNDF) concentration after 12-d incubation using empirical relationships (OMD iNDF ). L. perenne had the lowest content of cell wall fractions ( P P P PC and the other OMD methods were smallest in P. pratense ( P r > 0.91). The OMD IS1 and OMD IS2 had lower ( P PC , OMD GP and OMD iNDF (0.747, 0.724 and 0.723, respectively). In situ and in vitro gas production methods provided also digestion rate values ( k d(IS) and k d(GP) , respectively). Higher values were determined for k d(GP) (at average 0.0636/h) than for k d(IS) (at average 0.0364/h) ( P P k d(GP) . The results suggest that the relationship between pepsin–cellulase solubility and in vivo OMD could vary between grass species, and probably specific correction equations are needed. The in situ method clearly underestimated the rate of digestion and OMD, but high correlations with other OMD estimates and digestion rate estimated using in vitro gas production suggest that the method can be useful in ranking the feeding value of forages." @default.
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- W2065105440 date "2011-10-01" @default.
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- W2065105440 title "Comparison of methods for forage digestibility determination" @default.
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- W2065105440 doi "https://doi.org/10.1016/j.anifeedsci.2011.05.003" @default.
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