Seeding year alfalfa is just getting its "field legs" and needs to be managed differently than established alfalfa. Stems are spindly, roots are small and growth is slower. Following these harvest guidelines can help assure multiple harvests and a strong first season.
This spring many Nebraska livestock producers facing low forage supplies may be looking for new sources, such as from wheat. This Nebraska research on harvest timing suggests how to optimize feed value from wheat forage.
If high quality hay is your goal, don't delay harvest. However, if you're looking to rebuild your hay supply, letting it grow almost until bloom will provide more feed while using water resources more efficiently.