Livestock breeding has obvious seasonality, which is an adaptation of livestock to the specific weather conditions in the area. All types of livestock have different estrus and mating periods, and their pregnancies have their own lengths. However, the majority of livestock breeding periods are generally concentrated around the time when pastures return to the green period, and most of the livestock breeders escape the cold winter and early spring. For example, in many regions, a phenological indicator of the proper mating of young germinating mare is used because the gestation period of the horse is 11-12 months, so that one year later, when the warm-blooded puerpera starts, the mare eats green grass. With more milk, it is very beneficial to the growth and development of the young quail. Observing data confirms that livestock breeding requires certain temperature conditions. For example, when the sheep is mated, the ambient temperature is 8-12°C. When the temperature exceeds 20°C, the sheep’s libido is inhibited and the conception rate is significantly reduced. The ambient temperature is high. When mating at 30°C, the mortality of embryos was 25-85% higher than normal. If the ambient temperature is 35°C higher, the semen quality of the ram will deteriorate and the insemination ability will be basically lost. Therefore, in order to increase the sheep's fertility rate, the breeding time is mostly selected in the evening or in the morning. There is a de facto requirement for temperature in livestock breeding, and there are requirements for meteorological conditions such as sky conditions, relative humidity and wind. In general, the mating requirements require that the clouds be clear and cloudless, have a relative humidity of 30-50%, and wind power should be below the fourth level. Even heavy rain, windy sand, cold rain, wet snow and other weather can have adverse effects on the estrus and breeding of livestock and even cause the estrus of female animals to stop. Livestock have estrus, and the requirements for weather conditions for breeding vary from region to region. For example, in the area of ​​Jiangsu and Zhejiang, the seasonality of the estrus of the sheep is not obvious; goats raised in some areas in the south can be bred several times a year under the perennial hot weather conditions. Therefore, knowing the local climatic conditions and characteristics and grasping the law of estrus and mating of livestock are very important for improving the fertility rate of females and the survival rate of juveniles.
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