The quality and conservation of animal feed have become a fundamental step in the integration between Ruminant Nutrition and Forage and Pasture Science. In this program, conservation does not focus exclusively on the biochemistry of the process, but also on offering a comprehensive look at the global integration of animal production systems, food security, microbiome and volatilome and energy balance based on the conservation strategies adopted for forages, grains and co-products. Furthermore, forage conservation is treated as a tool for bioenergy surplus. Strategies to modify fermentation routes in silages or dehydration kinetics in hay processes are analyzed in detail.