Abstract: Rumen degradability and degradation kinetics of dry matter (DM) and crude protein (CP) were evaluated with the in situ technique for fresh or dry lucerne and grass forages. The degradability of each feedstuff was studied with a 2 x 2 factorial arrangement for two types (fresh and dry) and two forage species (lucerne and grass), and degradation kinetics (a: rapidly soluble fraction, b: potentially degradable fraction and c: rate constant of degradation) of DM and CP were calculated. Triplicate bags containing about 3 g DM ground forages were introduced into the rumen of two ruminally cannulated Karayaka rams and incubated for 4, 8, 16, 24, 48 and 72 h. The influence of the forage species on the a and b fractions and the c value of DM and CP (P < 0.01), and the effect of the forage type on the c value of DM and CP (P < 0.05) were significant. The a fraction and the c value of DM and CP were higher (P < 0.01) in lucerne forages than that in grass forages, while the b fraction of DM and CP in lucerne forages was lower (P < 0.01) than that in grass forages. The effect of the forage species on the effective degradability of DM (P < 0.05) and CP (P < 0.01) was significant. The effective degradability of DM (P < 0.05) and CP (P < 0.01) in lucerne forages was higher than those in grass forages. The results underlined the wide range of the intrinsic degradation capabilities of fresh or dry forages. These data could be useful for feeding systems of ruminants