Table 1. Classification and composition of major meat industry byproducts

Byproduct	% of live weight	Key components	Potential applications
Blood	3%–5%	Hemoglobin, plasma proteins, iron	Nutraceuticals, emulsifiers, animal feed
Bones	10%–15%	Collagen, calcium, phosphorus	Gelatin, bone meal, biomedical uses
Skin	7%–10%	Type I collagen, elastin	Cosmetics, gelatin, peptides
Fat	15%–20%	Triglycerides, fatty acids	Biofuels, soap, animal feed
Offal	10%–20%	Vitamins, minerals, high-quality proteins	Pharmaceuticals, feed, direct human consumption