1 73 calories per ounce or 28 g of sirloin steak lean and fat (1/8 rim of fat). 2  268 calories in a 4 oz or 114g sirloin steak (lean only). 3  402 calories in a 6 oz or 171g sirloin steak (lean only). 4  536 calories in an 8 oz or 227g sirloin steak (lean only).
Double muscling- A genetic trait in cattle where muscles are greatly enlarged rather than duplicate muscles. Double-muscled cattle...
Double muscled cattle are the result of a genetic defect causing hypertrophy of the skeletal muscles. Symptoms/Etiology: Double muscling is the result of a defect in the myostatin gene, which is responsible for regulating the growth of muscle fibers during development. Without a functioning mysostatin gene, muscles will develop hypertrophy (increase in muscle fiber size) and hyperplasia (increase in number of muscle fibers), resulting in the appearance of a âdouble muscledâ animal.