Willingness of County-level Circular Livestock and Poultry Breeding Entities to Combine Planting and BreedingBased on Empirical Analysis of Pig Farmers in Muping District，Yantai City

Circular agriculture is an important way to realize ecology of industrial models and promote green development of rural areas．As main body of manure resource utilization, willingness of pig farmers to adopt combined mode of planting and breeding is of great significance to development of circular agriculture．Based on 210 survey data in Muping District, Yantai City, Shandong Province, the Logit-ISM model was used to determine factors that significantly affected willingness of pig farmers to combine planting and breeding, and analyze hierarchical relationship and action path between influencing factors．Results indicated that factors that had a significant impact on willingness of pig farmers to combine planting and breeding included their age, expected income, financial support, supporting land, reducing pollution, conserving resources, promoting employment, and environmental regulatory pressure．Among them, pig farmers believed that combination of planting and breeding was beneficial for reducing pollution and expected benefits, which belonged to direct factor layer．Pig farmers believed that combination of planting and breeding was beneficial for promoting employment and resource conservation, and whether pig farmers had sufficient funds and land was an indirect factor．Age and regulatory pressure from environmental protection departments belonged to bottom layer of factors．Based on above analysis, suggestions were proposed to provide reference for government departments to formulate relevant policies．