This study evaluated the effect of supplemental vitamin E to ewes in late pregnancy on the rate of stillborn lambs. Ewes in 19 flocks in 5 regions of Norway were daily supplemented the 6–7 weeks before average expected lambing date with either (1) 360 IU of vitamin E (supplemented), or (2) placebo (control). The daily supplement was given in addition to the daily basal diet of forage, concentrate and mixture of minerals and vitamins in each flock, assuming that forage contained on average 40 mg