Fishmeal has been regarded as a valuable feedstuff for sheep as it supplies high levels of digestible undegradeable protein, however there is increasing consumer concern regarding the feeding of fishmeal to ruminants. The objective of this trial was to evaluate an alternative foodstuff based on 935g/kg protected soya, 15g/kg protected methionine (SmartamineTM) and 50g/kg yeast culture, Diamond V ‘XP’ yeast (FivexTM, Rumenco). The performance of silage fed pregnant ewes offered Fivex, was compared with similar ewes offered fishmeal with a barley based, 18% crude protein (CP) ration, as well as those offered a supplement based on rapeseed and soya, or rapeseed and soya with Diamond V ‘XP’ yeast culture.