Before cocoon formation, the excrement pulled by the silkworm baby will be unusually large (it will be a little bigger every time, but it will not be peeled this time). As you can see, the leaves in the excrement are almost undigested and the body is transparent, which are the characteristics of cocoon formation.
Before cocoon breaking is about to begin, there is another process-drainage. Silkworms only defecate, this time it is urine, but sometimes urine and stool will come out together, and the stool is yellow and white. Cocoon should be placed at an included angle, not on a flat place.
Extended data:
The temperature of silkworm rearing is high in summer and autumn, so it is necessary to open doors and windows and strengthen indoor ventilation. Spraying clear water on mulberry leaves and blowing a breeze indoors with an electric fan are also beneficial to indoor cooling.
It is forbidden to feed sick silkworms to livestock and poultry to prevent the spread of pathogens and pollute the environment.
The high temperature in summer and autumn leads to the rapid propagation of germs, so attention should be paid to picking leaves as needed, transporting them in time and storing them reasonably. Mulberry storage tanks should be disinfected once every age, and mulberry leaves should not be fed overnight.