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In this study we examined such a high-keratin-content slaughterhouse by-product as pig bristles and poultry feathers. Our first and most important aim in this research to make a decision about the using direction of a final products. Only after our decision we can determine the most optimal treating and processing method for these slaughterhouse by-products. In our model experiment we can produce different products for example raw materials for cosmetics and petfood products. But the requirements of two main using...