Evaluation of the Effectiveness of Comprehensive Prevention and Control Measures for Respiratory Diseases in Pig Farming

Abstract

All the causes of porcine respiratory diseases are the result of the combination of many pathogens and environmental factors. This paper examines the mechanism of immune evasion caused by the co-infection of porcine reproductive and respiratory syndrome virus and porcine circovirus type 2. It can be seen that ammonia is damaging to the mucous membrane, and high temperature and humidity are also harmful factors; a high stocking density may cause such damage. The three goals of this paper are air purification, reform of the immunisation programme and feed additives. Based on the previous analysis of morbidity, pathogen elimination efficiency, growth and treatment costs, interrupted time series analysis, nonlinear decay curve fitting and the marginal benefit net present value method have been used in this paper to obtain technical parameters for evaluating the effectiveness of prevention and control measures.