Cow nutrition requires conservation of seasonal pasture and fodder through hay making or silage making for off seasons. Hay can be made from grasses like Rhodes grass, lucerne grass, and vetch grass, while silage is suitable for grasses like Napier grass, sorghum, and green oats. Silage can be stored in various structures including tube silos, pit silos, above ground silos, trench silos, and tower silos.