The experiment was conducted on 192 Hy-Line hens at the age of 25 weeks, divided into 3 groups, 64 individually caged birds per group. Three diets were prepared: the control diet contained 450 g maize per kg, in two experimental diets maize was replaced by naked oats with or without the addition of an enzymatic preparation containing β-glucanase. Performance was recorded for 14 weeks; in the 5th week 30 eggs were collected from each group and their interior quality parameters were determined. Neither naked oats nor enzyme supplementation significantly affected performance parameters. The naked oats had no significant effect on the weight of eggs (62.8 g on average), albumen quality (74 Haugh units on average) and yolk weight, but decreased the shell weight by 0.6 percentage points and yolk colour by 0.7 points on the 15-point Roche scale.