Abandoned grasslands in Norway were studied to see how reintroducing grazing livestock could affect forage production and sheep performance. Sheep were grazed in the area for several weeks over three years, and different treatments were applied to compare results. The study found that grazing increased forage production by 72% compared to no grazing. Sheep consumed more and utilized the land better when grazed, with lambs gaining more weight when given an extended spring grazing period. The study also showed that sheep preferred to graze areas previously grazed by other sheep. Overall, reintroducing grazing to abandoned grasslands improved forage production and sheep performance, highlighting the value of these areas for agriculture.