1. If it is packed in a sealed box, it is usually fine to put it in the refrigerator at a constant temperature.

2. If it is bulk, put the blood in a basin and soak it in cool water before putting it in the refrigerator at a constant temperature.

Constant temperature should be able to put 2 or 3 days.

As for the deterioration of the reason is that the sheep's blood is full of nutrients, and rich, but the blood is made of raised blood, a small amount of flour and a small amount of salt, the blood does not keep for a long time.