White fish meal and feed additives are used to increase growth rate by young growing cattle in their first winter before being turned out to graze. Some evidence indicates that increased gains may not be retained through the grazing season. A trial was made to measure the effect of fish meal and feed additives, alone or in combination, on performance by young growing cattle during winter and subsequently through the grazing season. Sixty British Friesian castrated male calves were offered silage containing 220g/kg DM ad libitum. There were six dietary supplements.