天气和气候是家畜生态环境中的重要物理因素。气象因素不仅直接作用于家畜机体,而且可以通过饲料和饲草间接作用于家畜,同时,病原微生物和寄生虫与周围生态环境存在着密切的关系,因此,畜禽疾病的发生、发展和消亡的过程,则与天气和气候紧密相关。疾病发生的季节性及气象因子的关系就某些疾病的流行病学来看,呈现季节性的特点,这是与病原微生物和吸血昆虫的生态学有密切关系。有的疾病因气温影响,为病菌繁殖和产生毒素创造了有利的环境条 Weather and climate are important physical factors in the livestock ecosystem. Meteorological factors not only act directly on domestic animals, but also act indirectly on domestic animals through feed and forage. At the same time, there are close relationships between pathogenic microorganisms and parasites and the surrounding ecological environment. Therefore, the occurrence, development and demise of livestock diseases The process is closely related to the weather and climate. Seasonal and Meteorological Factors Affecting the Occurrence of Seasonal Diseases In terms of the epidemiology of some diseases, the seasonal characteristics of the disease are closely related to the ecology of pathogenic microorganisms and blood-sucking insects. Some diseases due to the impact of temperature, for bacteria multiply and produce toxins have created favorable environmental conditions