The lipid content of frankfurters decreased from 50% of replacement, as seen in Table 5. Between SS and SC75, the reduction was approximately 30%. The use of collagen to replace fat increased the protein content of Frankfurter-type sausages. SC75 treatment showed the highest protein content due to the high addition of collagen (26.28%), with 43.5% more protein than the minimum levels established by Brazilian law. These results were similar to those observed by Pereira et al. (2011) analyzing the quality of chicken sausages with the addition of collagen fiber. The ash content increased with higher addition of hydrolyzed collagen, probably by reducing the moisture content, which increased in percentage terms the dry extract of the product or due to a possible chelating activity of minerals by the action of collagen (Lafarga & Hayes, 2014).