Abstract: With the rapid development of my country's pig farming industry, the shortage of corn as the main energy feed had become increasingly prominent, and had become a key factor restricting feed grain safety and breeding cost control. In order to alleviate the structural contradiction of feed grain and promote the diversification of feed resources, this paper systematically sorted out the types of energy feed resources that could be used to replace corn in my country and their feeding research progress. The nutritional composition, metabolic energy level, anti-nutritional factor characteristics of tubers such as rice, wheat, sorghum, barley, cassava, potato, sweet potato, and sugar products such as molasses and near-expiry candy were analyzed, as well as their applicability in different pig breeds and feeding stages. The results showed that a variety of alternative resources had certain advantages in nutritional structure, regional production capacity and feeding function, and could achieve effective partial replacement of corn on the basis of scientific formula and reasonable processing. However, the current alternative resources still faced problems such as ingredient fluctuations, poor processing adaptability and imperfect supply chain system in the industrial application of feed. In order to promote its large-scale promotion and application, it was necessary to strengthen the construction of nutritional standard system, optimization of processing detoxification technology, construction of resource dynamic database and integration of regional industrial chain in the future. This study provided a theoretical basis and technical support for the optimization of pig feed structure and efficient development of alternative resources in my country.

Key words: corn substitution, energy feed, pig feed, non-food resources, nutritional requirements