Abstract: The nutritive values of wild chicory, Cichorium intybus hays harvested at vegetative, flowering, late maturity stages were evaluated by chemical composition, in situ nylon bag and in vitro gas production techniques. In situ Dry Matter (DM), Crude Protein (CP) disappearance and in vitro gas production were determined at 0, 3, 6, 12, 24, 48, 72 and 96 h incubation times and their kinetics were described using the equation y = a + b(1-e-ct). Maturity had a significant effect on the chemical composition. Neutral Detergent Fibre (NDF), Acid Detergent Fibre (ADF) and Condensed Tannin (CT) contents increased with increasing maturity whereas Crude Protein (CP) and ash contents decreased. Maturity stage had also a significant (p<0.001) effect on in situ DM, CP disappearance, in vitro gas production and estimated parameters. Effective Dry Matter (EDMD), Effective Crude Protein Degradability (ECPD) and most of the estimated parameters of wild chicory harvested at vegetative stage were significantly (p<0.001) higher than those obtained at flowering and late maturity stages. Crude protein, EDMD, ECPD and Metobolizable Energy (ME) content wild chicory decreased as maturity advanced. Therefore wild chicory should be harvested at vegetative stage to obtain higher quality forage.