Due to its slower rate of rumen degradation, molassed sugar beet pulp (MBP) is considered to result in a higher pH in rumen fluid wnen compared with cereals and to be of benefit in diets where maximum fibre digestion is desired (Fahmy et al., 1984). Sodium hydroxide-treatment of MBP, by increasing feed pH may increase the value of MBP still further in these situations. The most common method of processing whole cereal grains is dry rolling. Sodium hydroxide pre-treatment has also been shown to increase the digestibility of whole cereal grains close to thai achieved by dry rolling (Orskov, 1979). Little information is available on the relative effects on rumen fermentation of both processing methods. The objectives of this study were to (1) determine the effects of treating MBP with NaOH and (2) compare the effects of rolfing (R) and S as processing methods for barley and wheat, on rumen fermentation and dry matter (DM) degradability (DMD) in steers offered grass silage.