关键词: 承包制, 保育育肥猪, 育肥增重成本

Abstract: In recent years，in the context of the continuous fluctuation of the live pig market，in order to seek an effective path to reduce costs and increase efficiency，this study focused on the innovation of internal management mechanism，introduced and implemented the contract system model in the feeding management of nurseries and finishing pigs，and explored and analyzed different coverage rates of the contract system（0 in the control group，test group I &Ⅱ；50%，trial group Ⅱ ≥50% and trial group Ⅲ 100%）of feeding management and economic benefits. The results showed that：compared with the control group，there were no significant differences in final weight，average daily gain，feed to gain ratio，FSA，mortality and feed weight gain cost in experimental group Ⅱ when the contract system coverage rate was ≥50% during the whole feeding process（P>0.05），but the fattening and weight gain cost was significantly decreased（P<0.01）；When the coverage rate of contract system was 100%，the final weight and FSA of trial group Ⅲ increased significantly（P<0.01），feed to gain ratio，mortality rate，feed weight gain cost and fattening weight gain cost were significantly decreased （P<0.01）. To sum up，the fattening contract system significantly improves production performance，effectively reduces production costs，and improves economic benefits. According to the fattening pig sales unit price of 18 yuan /kg，the average fattening profit of test group Ⅱ and Ⅲ was improved. The deep⁃level reason analysis reveals that the implementation of the pig contract system can stimulate the labor enthusiasm and initiative of employees，which provides a powerful internal management mechanism innovation direction for the sustainable development of the pig farming industry.

Key words: Contract system, Raising and fattening pigs, Fattening and weight gain cost