Data from: Nitrogen fertilization versus legume inclusion in meadow fescue grazing systems

This two-year study (2023–2024) evaluated Holstein heifers grazing three meadow fescue systems: Meadow Fescue + N fertilizer (MF+N; 157 kg N/ha/yr), Meadow Fescue + Clover (MF+Clover), and non-N fertilized Meadow Fescue (MF). The experiment was conducted at the University of Wisconsin Marshfield Agricultural Research Station, located in Marshfield, Wisconsin. The experiment was arranged in a randomized complete block design. Heifers were managed using rotational stocking on 0.8-ha pastures, each subdivided into 10 paddocks.