Abstract: The muscle protein composition of black guinea -pig was separated and determinated i.e. non-protein nitrogen 475mg/100g wet muscle sarcoplasmic protein 5.26%,myofibrillar protein 8.53%,total stroma protein 1 .01%, alkali-soluble stroma protein 0.64% non-alkali-soluble stroma protein 0.485%, acid-soluble stroma protein 0.450%,swelling factor 42 .The contents of glutamic acid. Spartic acid and tyrosine acid in muscle were higher .The biology value of essential amino acid was 82.The changes of myofibrillar protein solubilities were examined during ice-storage (0℃) and freezing storage (- 10℃ ).The protein denaturation in ice-storage occurred easier than in freezing storage The myofibillar protein solubilities were suggested as the useful index in examining protein denaturation.

Key words: Black guinea-pig, Protein composition, Cold-storage stabilities