Quality control of feather powder

Recently, some feather powder has been imported into our factory, but the color and particle size of each batch are not uniform. And the measured indicators are also unstable, what is the range of ash content? I wonder what kind of feather powder is checked and accepted by everyone. Recently, we have a lot of snow here, now, the supplier said that the weather is too wet, please have experts in the study of feather powder to help me explain this problem. Thank you! With different kinds of feathers and different processes, the appearance and nutritional composition of the products are very different. The ash content of pure washed chicken feather powder should be 2-3%, while the ash content of washed duck feathers is lower. If the color is different, it shows that the drying, processing temperature and time and the freshness of the raw materials are different, and the particle size is also related to the process. The weather tide will increase the drying time and make the color redder. Products produced by drying hair are black in color and contain 7-10% ash. It is better to use less. Can look for fine compound processing products, such as some enzymatic hydrolysis products, the quality is more stable, nutritional value is also higher.