title: In vivo rat assay for true protein digestibility and protein quality of beef and meat products extended with soy protein.
abstract: The protein quality of ten food products in including beef, bovine rumen and four meat products extended with soy proteins had been evaluated by rat feeding experiment; defatted freeze-dried whole egg served as a reference protein. Mean endogenous fecal and metabolic urinary nitrogen amounted to 1.01 and 1.11 mg/g food consumed, respectively. True protein digestibility and biological value of beef averaged 90.3% and 82.6%, respectively. The protein qualities of bovine rumen are quite similar to that of beef. Beef products extended with soy protein are quite inferior in their true protein digestibilities (81.4-84.6%) and biological value (68.8-76.0%) as compared to beef. The utilizable protein of extended meat fluctuated between 22.6-29.3% compared with a mean level of 70% in beef.
authors.affiliation: Department of Nutrition, National Research Center, Giza, Egypt.
authors.forename: S
authors.initials: S
authors.lastname: Abdel-Aziz
authors.forename: L
authors.initials: L
authors.lastname: Hussein
authors.forename: S
authors.initials: S
authors.lastname: Esmail
authors.forename: N
authors.initials: N
authors.lastname: el-Awadi
mesh_terms: D000818:Animals; D002417:Cattle; D004044:Dietary Proteins / Q000378:metabolism*; D004063:Digestion; D005526:Food, Formulated; D008297:Male; D008460:Meat; D008461:Meat Products; D009753:Nutritive Value; D051381:Rats; D017207:Rats, Sprague-Dawley; D030262:Soybean Proteins
chemical_list: D004044:Dietary Proteins; D030262:Soybean Proteins