Relationship between chemical composition and in vitro digestibility of some Spanish browse plants | Corrélation entre la composition chimique et la digestibilité in vitro de quelques espèces arbustives de l'Espagne
2005
Ammar, H.(Departamento de Producción Animal, Universidad de León (Spain)) | López, S. | González, J.-S. | Ranilla, M.J.
Chemical composition and in vitro digestibility (IVD) were determined in 22 samples of leaves and flowers of six browse plant species (Erica australis, Cistus laurifolius, Quercus pyrenaica, Cytisus scoparius, Genista florida and Rosa canina) to examine the correlation between some chemical fractions and the digestibility of these fodder resources. Samples were analysed for extractable phenols, tannins, and condensed tannins. The activity of phenolic compounds was assessed as the increase in the in vitro gas production after incubation in rumen fluid in response to the addition of polyethylene glycol (PEG). IVD was positively (P less than 0.01) correlated with the crude protein content, showing negative relationships with the ADF and lignin contents. Digestibility and tannin concentrations were negatively correlated showing inverse linear relationships with either the tannin concentrations or their biological activity assessed using PEG. Thus, lignin and tannin seem to be the main constraints of digestibility of browse plant species
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