| Hunan Province is a major province for pig breeding in my country,and the annual number of pigs produced for slaughter has always been in the forefront of the country,maintaining a steady growth momentum.Hengshan County has been selected as a major county for pig transfer in Hunan Province for ten consecutive years,and has made important contributions to the pig breeding industry in Hunan Province.The pig breeding industry in Hengshan County continues to develop and grow towards a largescale trend.However,as the scale of breeding continues to increase,the cost of manure treatment has also increased,and some farmers are pursuing economic profits solely while ignoring environmental protection.Many farms do not properly and effectively treat and use the manure discharged from the pig breeding process,and directly discharge it to public agricultural land,resulting in more serious pollution of manure waste.In addition,the scale of the planting industry lags behind that of the aquaculture industry,and a situation of separation has gradually formed.The manure that has "resource attributes" becomes a source of environmental pollution,which directly has a negative external impact on the ecological environment around the farm.The pollution of breeding waste has therefore become a bottleneck restricting the development of the pig breeding industry in Hengshan County.In this context,pig farmers are facing tremendous pressure from environmental protection and other aspects in the breeding process,and the cost of farming manure treatment will inevitably rise with the increase in environmental protection investment,forcing farmers to change the scale of pig breeding.Local optimization and adjustment,and selection of appropriate scale breeding of live pigs will become a reality.The combination of planting and breeding is an effective way to use manure as a resource,which is strongly advocated by the state.Implement effective docking of planting and breeding,encourage farmers to adopt a combined planting and breeding manure treatment model and choose an appropriate breeding scale,macroscopically adjust and optimize the layout of the breeding area in Hengshan County,and guide Hengshan County to develop aquaculture.The development bottleneck of the pig breeding industry in Hengshan County is of great significance to realize the healthy and sustainable development of animal husbandry.The research idea of this paper: Firstly,calculate the total breeding scale of the theoretical carrying capacity of the existing absorbing land in Hengshan County according to the principle of planting and breeding combined with the principle of "fixing by land" from the macro level;then from the micro level,according to the actual survey situation,Based on the analysis of the current situation of the combined planting and breeding pig farms in Hengshan County,Hunan Province,the relevant economic benefit data indicators and manure treatment costs and benefits data of three different scales of large,medium and small scale pig farming in Hengshan County are selected for analysis.The grey situation decision-making model was used to further measure and compare the comprehensive benefits of different pig farming scales in Hengshan County,Hunan Province;finally,through the case studies of farms of different scales to analyze the influencing factors of the combination of planting and breeding and the appropriate scale,the overall scale of pig farming in Hengshan County and its various The development of farms provides theoretical guidance,reference significance and policy recommendations.The main conclusions drawn in this paper:(1)The current land carrying capacity index for livestock and poultry breeding in Hengshan County is 46.51%,which is still at a low carrying capacity level overall,and there is no environmental pollution risk caused by overloading of breeding carrying capacity.The pig breeding industry in Hengshan County still has some room for development,and it has good conditions to develop a combination of breeding and breeding.According to the actual planting and breeding practices of Hengshan County,it is estimated that the main crop manure nitrogen nutrient requirement is 140,708,200 tons.The theoretical carrying capacity of the existing consumption land is 2.007 million pig equivalents,and the current equivalent total pig production equivalent It is 933,600 heads,which still has a large potential for manure absorption;(2)Through the analysis of the gray decision model,the comprehensive effect measures of the three farming scales are: 0.8625 for small scale,0.8968 for medium scale,and 0.8966 for large scale.Is 0.9276.The results of the study show that the comprehensive measurement results of large-scale pig breeding are the best,and large-scale breeding should be promoted and encouraged in Hengshan County.(3)Based on the analysis of field investigations and case studies,it is concluded that large-scale breeding has become the main trend in the development of pig breeding in Hengshan County,and the appropriate scale is specifically about 1,000-2,000 pigs per year.In Hengshan County,the cultivation of camellia oleifera for pig breeding is one of the feasible modes of combination of planting and breeding.Regarding the influencing factors of the combination of planting and breeding,environmental laws and policies and the difficulty of land transfer are the most important objective factors that affect the farmers,while the economic benefits and the amount of funds consumed by the manure equipment are the breeding enterprises or professional breeding.The subjective factors considered by households;regarding the adoption of appropriate scale breeding,the market conditions of pig breeding and breeding profits are still the primary factors considered by pig farmers. |
