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...
Newsletter sign up. Newsletter sign up. The Sirloin is the area of the cow between the Short Loin and the Round (or the back of the cow and the back hip of the cow.) There are several different muscles in this area, including a bit of Tenderloin, Top Sirloin, Sirloin Butt and Bottom Sirloin Butt.