Here's a link to a 271 lb. show pig. http://farmanddairy.lyleprintingandp.ne ... g_.JPG.jpg
That sow was probably closer to 100 lb., could have been less. She just wasn't that big.
There was a lot of waste because she was either pregnant or nursing (I'm guessing pregnant rather than nursing because she didn't have piglets with her and she doesn't look like she's been pulled down raising pigs).
With market hogs, you get a dressing percentage of 70-72%, but they are fatter and more muscular. Then from carcass to boneless, it's 65%-70%. So about half of the live weight is meat.
If those statistics were true for that hog, she'd weigh 75-80 lb. I suspect that her dressing percent was lower than 70-72% because she was neither particularly fat nor muscular and she had extra waste tissue in her mammary glands and uterus/piglets. I'm pretty comfortable with my "guesstimate" of 100 lb., give or take.http://animalscience.psu.edu/extension/ ... 20Meat.pdf