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An in vivo study was conducted into the effects of partial replacement of dried ground corn grain with dried whey – as a supplement to alfalfa haylage (AH) or Italian ryegrass haylage (IRH) - on ad libitum intake, in vivo digestibility and N retention in wether sheep. The chemical composition of AH and IRH was roughly the same, except for the crude protein (CP) content which was much higher in AH compared with IRH. Sheep fed the AH-based diet had higher feed intake. Higher CP digestibility and higher N retention, as well as higher levels of excreted N, were shown compared IRHbased diet. The IRH-based diet increased the digestibility of chemical parameters studied, except CP and starch. The partial replacement of corn grain with dried whey reduced the intake of acid detergent fibre (ADF), improved the starch digestibility in AH and IRH-based diets, and increased the overall N intake in wethers fed the AH-based diet. In practical conditions, replacing 10% of corn grain with dried whey in a ration based on higher quality forage is a way to increase N intake in sheep. In conclusion, the partial replacement of corn grain with dried whey in a forage-based diet with higher CP content improves the nitrogen efficiency in the diet of wether sheep., Provedeno je in vivo istraživanje utjecaja djelomične zamjene suhog mljevenog zrna kukuruza sirutkom u prahu kao dodatka sjenaži lucerne (SL) ili sjenaži talijanskog ljulja (STL) na ad libitum konzumaciju, in vivo probavljivost i bilancu N u hranidbi kastriranih ovnova. Kemijski sastav SL i STL je bio otprilike isti, osim sadržaja sirovih proteina (SP) koji je bio veći kod SL u usporedbi s STL. Hranidba bazirana na SL imala je veću konzumaciju, veću probavljivost SP i veću bilancu N, kao i više izlučenog N u usporedbi s hranidbom baziranom na STL. Hranidba bazirana na STL je imala veću probavljivost istraživanih kemijskih parametara, osim SP i škroba. Djelomična zamjena zrna kukuruza sirutkom u prahu smanjila je konzumaciju kiselih detergent vlakana (KDV), povećala probavljivost škroba u hranidbi baziranoj na SL i STL i povećala ukupnu konzumaciju N u hranidbi baziranoj na SL. U praktičnim uvjetima zamjena 10% zrna kukuruza sirutkom u prahu u obroku na bazi kvalitetnije krme dovoljna je za povećanje konzumacije N. Zaključno, djelomična zamjena zrna kukuruza sirutkom u prahu u krmnoj osnovi s većim sadržajem SP povećava energetsku učinkovitost obroka u smislu konzumacije N i metabolizma.