Different body types: Danish breeding pigs are large in size, with a moderate head size, slightly concave face, medium ears, drooping, long body, well developed, slightly concave back and waist, large and deep abdomen, slightly inclined hips and meticulous and solid limbs; Rongchang pig is of medium build, with a moderate head size, slightly concave face, big ears, drooping, wrinkled forehead, spiral hair, long body, well developed, slightly concave back and waist, large and deep abdomen, slightly inclined hips and delicate and solid limbs.

Different breeding techniques: Danish pig industry adopts scientific breeding techniques, pays attention to the quality and inheritance of breeding pigs, optimizes parents' breeding pigs through artificial insemination, and improves litter rate, growth rate and lean meat rate; Rongchang pigs mainly adopt traditional breeding methods, pay attention to the quality and adaptability of pigs, and improve the disease resistance and growth rate of pigs through natural breeding.