What are the experiences of shearing wool summarized in Qi Yaomin's Book?

Uncle Qi summed up the experience of shearing wool and said that from March to August, after shearing wool, the sheep should be washed well. This will make the wool that grows in the future white and clean. However, after cutting in August and a half, never bathe the sheep again. Because the solar term has passed the Millennium at this time, the cold in the morning and evening is easy to freeze the sheep. When to cut your hair is appropriate, it depends on different situations in different places. In the Yellow River valley, wool must be cut once in August. If you don't cut it, the wool will grow together, so this wool can't be woven into felt, which will cause great losses. Sheep outside the Great Wall or in desert areas should not be sheared to avoid freezing to death, because the weather is getting colder and colder after August.